CN107040321B

CN107040321B - Reference ring calibration method and device

Info

Publication number: CN107040321B
Application number: CN201611161990.2A
Authority: CN
Inventors: 赵子琦; 张伟; 石德臣; 李新磊; 叶轲; 房海云; 孙亮; 马研
Original assignee: CRSC Beijing Rail Industry Co Ltd
Current assignee: Beijing Railway Signal Co Ltd
Priority date: 2016-12-15
Filing date: 2016-12-15
Publication date: 2020-08-21
Anticipated expiration: 2036-12-15
Also published as: CN107040321A

Abstract

The invention provides a method and a device for calibrating reference rings, wherein the attenuation difference value between the reference rings in each reference ring group is obtained through calculation; calculating an error value of the reference ring by using the attenuation difference value; calculating to obtain a position compensation value of each reference ring group by using the set position offset of the reference ring and the calculated error value of the reference ring; calculating to obtain a compensation attenuation difference value between the reference rings in each reference ring group by using the position compensation value of each reference ring group and the attenuation difference value between the reference rings in each reference ring group; calculating to obtain a compensation error value of the current reference ring by using the compensation attenuation difference value; and calculating the correction parameter of the current reference ring by using the compensation error value of the current reference ring. The offset of the geometric center and the electrical center of the reference ring caused by the manufacturing of the reference ring is compensated to the calibration process of the reference ring, so that the calibration precision of the reference ring is improved.

Description

Reference ring calibration method and device

Technical Field

The invention belongs to the technical field of reference rings, and particularly relates to a method and a device for calibrating a reference ring.

Background

In the prior art, a reference ring is used as a reference antenna in a transponder test, and the test is performed at two frequency points, namely radio frequency energy and an uplink. Due to objective reasons such as materials and processes for manufacturing the reference ring, a certain error exists between the manufactured reference ring and the reference ring calculated by a theoretical formula, and therefore when the reference ring is used as a reference antenna to test a transponder, a test result of the transponder is affected.

The reference ring therefore has a calibration requirement in actual use in order to reduce this error by calibration in order to improve the accuracy of the transponder test results.

In conventional calibration methods, a calibration object with a higher accuracy than the object to be measured is usually used to calibrate the object to be measured. However, the reference ring is only a reference piece of a railway-specific product, and there is no standard reference ring that is recognized as the highest precision, so that the manufactured reference ring cannot be calibrated by using the standard reference ring.

It is now common practice to take multiple measurements using an uncalibrated reference ring measurement and then average the measurements. But this can only reduce human error and cannot reduce systematic error. I.e. errors in the reference ring itself, do not cancel the effect on the transponder test results.

Disclosure of Invention

In view of the above, the present invention provides a method for calibrating a reference ring, which is used to calibrate the reference ring and reduce the influence on the test result of a transponder.

The technical scheme is as follows:

the invention provides a reference ring calibration method, which comprises the following steps:

selecting N reference rings, wherein N is more than or equal to 3;

respectively calculating to obtain the attenuation difference value between the reference rings in each reference ring group; wherein the reference ring group consists of any two of the N reference rings;

calculating to obtain an error value of the current reference ring by using an attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and an attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; wherein the current reference ring is any one of the N reference rings;

calculating a position compensation value of each reference ring group by using the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group; calculating to obtain a compensation attenuation difference value between the reference rings in each reference ring group by using the position compensation value of each reference ring group and the attenuation difference value between the reference rings in each reference ring group;

calculating to obtain a compensation error value of the current reference ring by using a compensation attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and a compensation attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group;

calculating a correction parameter of the current reference ring by using the compensation error value of the current reference ring;

and calibrating the current reference ring according to the correction parameters of the current reference ring.

Preferably, the calculating the correction parameter of the current reference ring by using the compensation error value of the current reference ring comprises:

judging whether the compensation error value of the current reference ring meets a first preset condition or not; when the first preset condition is not met, selecting a position offset different from the last time within a first preset range, adjusting the position offset of any reference ring to obtain an adjusted position offset, and taking the adjusted position offset as the position offsets of two reference rings in each set reference ring group;

returning to execute the step of calculating the position compensation value of each reference ring group and the subsequent steps thereof by utilizing the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group;

when the first preset condition is met, judging whether the compensation error value of the current reference ring meets a second preset condition or not;

when the second preset condition is not met, selecting an error value different from the last reference ring in a second preset range, adjusting the error value of any reference ring to obtain an adjusted error value of the reference ring, and taking the adjusted error value of the reference ring as the calculated error value of two reference rings in the reference ring group;

returning to execute the step of calculating the position compensation value of the reference ring group and the subsequent steps thereof by utilizing the position offset of the two reference rings in the set reference ring group and the calculated error value of the two reference rings in the reference ring group;

when the second preset condition is met, judging whether the compensation error value of the current reference ring meets a third preset condition or not;

when the third preset condition is not met, judging whether the position offset of two reference rings in the set reference ring group traverses the first preset range or not, and calculating whether the error value of the two reference rings in the set reference ring group traverses the second preset range or not;

if so, adjusting the first preset range to obtain an adjusted first preset range; taking the adjusted first preset range as a first preset range, adjusting the position offset of any reference ring in the first preset range, and taking the adjusted position offset as the position offset of two reference rings in a set reference ring group;

if not, continuously adjusting the position offset of any reference ring in the first preset range, adjusting the error value of any reference ring in the second preset range, taking the adjusted position offset as the position offset of two reference rings in the set reference ring group, and taking the adjusted error value of the reference ring as the error value of the two reference rings in the reference ring group obtained by calculation;

and when a third preset condition is met, calculating a correction parameter of the current reference ring by using the compensation error value of the current reference ring.

Preferably, the separately calculating the attenuation difference between the reference rings in each reference ring group includes:

respectively measuring the transmission attenuation among the reference rings in each reference ring group to obtain a measured transmission attenuation value among the reference rings in each reference ring group;

calculating the transmission attenuation between reference rings in any one reference ring group to obtain a theoretical transmission attenuation value between the reference rings in any one reference ring group;

and respectively calculating to obtain the attenuation difference value between the reference rings in each reference ring group by using the measured transmission attenuation value and the theoretical transmission attenuation value.

Preferably, the calculating the compensation attenuation difference between the reference rings in each reference ring group by using the position compensation value of each reference ring group and the attenuation difference between the reference rings in each reference ring group includes:

adding the position compensation value of each reference ring group and the measurement transmission attenuation value between the reference rings in each reference ring group to obtain the compensation measurement transmission attenuation value of each reference ring group;

and calculating to obtain a compensation attenuation difference value between the reference rings in each reference ring group by using the compensation measurement transmission attenuation value and the theoretical transmission attenuation value.

Preferably, the measuring the transmission attenuation between the reference rings in each reference ring group respectively to obtain the measured transmission attenuation value between the reference rings in each reference ring group includes:

setting a second reference ring at a plurality of positions different from the first reference ring with the geometric center of the first reference ring in the reference ring set as a coordinate origin;

measuring to obtain radio frequency energy frequency point energy values and uplink frequency point energy values between a first reference ring and a second reference ring of the second reference ring at a plurality of positions;

calculating by using the radio frequency energy frequency point energy values to obtain radio frequency energy frequency point measurement transmission attenuation values of the second reference ring at a plurality of positions;

and calculating uplink frequency point measurement transmission attenuation values of the second reference ring at a plurality of positions by using the uplink frequency point energy value.

Preferably, the measuring the radio frequency energy frequency point energy value and the uplink frequency point energy value between the first reference ring and the second reference ring of the second reference ring at one position comprises:

measuring to obtain a 0-degree radio frequency energy frequency point energy value and a 0-degree uplink frequency point energy value between the first reference ring and the second reference ring;

rotating the second reference ring 180 degrees in the horizontal plane with the first reference ring position unchanged;

and measuring to obtain a 180-degree radio frequency energy frequency point energy value and a 180-degree uplink frequency point energy value between the first reference ring and the second reference ring.

Preferably, the calculating the transmission attenuation between reference rings in any one reference ring group to obtain the theoretical transmission attenuation value between reference rings in any one reference ring group includes:

by using

Calculating to obtain theoretical transmission attenuation values of uplink frequency points between reference rings in any one reference ring group;

wherein, a1 represents the theoretical transmission attenuation value of the uplink frequency point between the reference rings in a reference ring group; ω 1 ═ 2 π × f, f ═ 4 MHz; m represents the mutual inductance between the reference rings in a reference ring set; e represents a resistance constant;

by using

Calculating to obtain a theoretical transmission attenuation value of a radio frequency energy frequency point between reference rings in any one reference ring group;

wherein, A2 represents the theoretical transmission attenuation value of the radio frequency energy frequency point between the reference rings in a reference ring group; ω 2 ═ 2 π × f, f ═ 27 MHz; m represents the mutual inductance between the reference rings in a reference ring set; and E represents a resistance constant.

Preferably, the calculating an error value of the current reference ring by using an attenuation difference between reference rings in a reference ring group including the current reference ring among two reference rings constituting the reference ring group and an attenuation difference between reference rings in a reference ring group not including the current reference ring among the two reference rings constituting the reference ring group includes:

by using

Calculating to obtain a 0-degree uplink frequency point error value of the current reference ring;

wherein, error P (4, 0, k) represents the 0 degree uplink frequency point error value of the current reference ring P; n represents the number of the selected reference rings; p denotes the current reference ring; d1() represents the difference between the measured transmission attenuation value of 0 degree uplink frequency point between two reference rings in the reference ring set and the theoretical transmission attenuation value of uplink frequency point between two reference rings in the reference ring set; k represents a position number;

by using

Calculating to obtain a 180-degree uplink frequency point error value of the current reference ring;

wherein, error P (4, 180, k) represents a 180-degree uplink frequency point error value of the current reference ring P; n represents the number of the selected reference rings; p denotes the current reference ring; d2() represents the difference between the measured transmission attenuation value of the 180-degree uplink frequency point between the two reference rings in the reference ring set and the theoretical transmission attenuation value of the uplink frequency point between the two reference rings in the reference ring set; k represents a position number;

by using

Calculating to obtain a 0-degree radio frequency energy frequency point error value of the current reference ring;

wherein, the error P (27, 0, k) represents the error value of the 0-degree radio frequency energy frequency point of the current reference ring P; n represents the number of the selected reference rings; p denotes the current reference ring; d3() represents the difference between the 0-degree radio frequency energy frequency point measurement transmission attenuation value between two reference rings in the reference ring set and the radio frequency energy frequency point theoretical transmission attenuation value between the two reference rings in the reference ring set; k represents a position number;

by using

Calculating to obtain a 180-degree radio frequency energy frequency point error value of the current reference ring;

wherein, ErrorP (27, 180, k) represents the 180-degree radio frequency energy frequency point error value of the current reference ring P; n represents the number of the selected reference rings; p denotes the current reference ring; d4() represents the difference between the 180-degree RF energy frequency point measurement transmission attenuation value between two reference rings in the reference ring set and the RF energy frequency point theoretical transmission attenuation value between two reference rings in the reference ring set; k represents a position number.

Preferably, the calculating the position compensation value of each reference ring group by using the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group includes:

adding the 0-degree radio frequency energy frequency point error values of the current reference ring and then averaging to obtain an average 0-degree radio frequency energy frequency point error value of the current reference ring;

adding the 180-degree radio frequency energy frequency point error values of the current reference ring and then averaging to obtain an average 180-degree radio frequency energy frequency point error value of the current reference ring;

adding the average 0-degree radio frequency energy frequency point error value of the current reference ring and the average 180-degree radio frequency energy frequency point error value of the current reference ring and averaging to obtain an average radio frequency energy frequency point error value of the current reference ring;

adding the average radio frequency energy frequency point error values of two reference rings forming a reference ring group to obtain the measurement error of the radio frequency energy frequency point of each reference ring group;

calculating to obtain a radio frequency energy frequency point position compensation value of the current reference ring group by using the position offset of two reference rings in the current reference ring group, the partial derivatives in three directions of the coordinate axis and the measurement error of the radio frequency energy frequency point of the current reference ring group;

adding the 0-degree uplink frequency point error values of the current reference ring and averaging to obtain an average 0-degree uplink frequency point error value of the current reference ring;

adding the 180-degree uplink frequency point error values of the current reference ring and then averaging to obtain an average 180-degree uplink frequency point error value of the current reference ring;

adding the average 0-degree uplink frequency point error value of the current reference ring and the average 180-degree uplink frequency point error value of the current reference ring and averaging to obtain an average uplink frequency point error value of the current reference ring;

adding the average uplink frequency point error values of the two reference rings forming the reference ring group to obtain the measurement error of the uplink frequency point of each reference ring group;

and calculating to obtain the uplink frequency point position compensation value of the current reference ring group by using the position offset of two reference rings in the current reference ring group, the partial derivatives in three directions of the coordinate axis and the measurement error of the uplink frequency point of the current reference ring group.

The present invention also provides a reference ring calibration apparatus, the apparatus comprising:

the selection unit is used for selecting N reference rings, wherein N is more than or equal to 3;

the attenuation difference calculation unit is used for respectively calculating and obtaining the attenuation difference between the reference rings in each reference ring group; wherein the reference ring group consists of any two of the N reference rings;

an error value calculation unit, configured to calculate an error value of the current reference ring by using an attenuation difference value between reference rings in a reference ring group including the current reference ring among two reference rings constituting the reference ring group and an attenuation difference value between reference rings in a reference ring group not including the current reference ring among the two reference rings constituting the reference ring group; wherein the current reference ring is any one of the N reference rings;

the position compensation value calculation unit is used for calculating a position compensation value of each reference ring group by using the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group;

a compensation attenuation difference calculation unit, configured to calculate a compensation attenuation difference between reference rings in each reference ring group by using the position compensation value of each reference ring group and an attenuation difference between reference rings in each reference ring group;

the compensation error value calculation unit is used for calculating a compensation error value of the current reference ring by utilizing a compensation attenuation difference value between reference rings in a reference ring group which comprises the current reference ring in two reference rings forming the reference ring group and a compensation attenuation difference value between reference rings in a reference ring group which does not comprise the current reference ring in the two reference rings forming the reference ring group;

a correction parameter calculation unit for calculating a correction parameter of the current reference ring by using the compensation error value of the current reference ring;

and the calibration unit is used for calibrating the current reference ring according to the correction parameters of the current reference ring.

Preferably, the correction parameter calculation unit includes:

the first judging unit is used for judging whether the compensation error value of the current reference ring meets a first preset condition or not;

when the first preset condition is not met, selecting a position offset different from the last time within a first preset range, adjusting the position offset of any reference ring to obtain an adjusted position offset, and taking the adjusted position offset as the position offsets of two reference rings in each set reference ring group;

a second judging unit, configured to judge whether the compensation error value of the current reference ring satisfies a second predetermined condition when the first judging unit judges that the first predetermined condition is satisfied;

a third judging unit, configured to judge whether the compensation error value of the current reference ring satisfies a third predetermined condition when the second judging unit judges that the second predetermined condition is satisfied;

and a correction parameter calculating subunit, configured to calculate a correction parameter of the current reference ring by using the compensation error value of the current reference ring when the third determining unit determines that the third predetermined condition is satisfied.

Preferably, the attenuation difference calculation unit includes:

the measuring subunit is used for respectively measuring the transmission attenuation among the reference rings in each reference ring group to obtain a measured transmission attenuation value among the reference rings in each reference ring group;

the theoretical value calculating operator unit is used for calculating the transmission attenuation among the reference rings in any one reference ring group to obtain the theoretical transmission attenuation value among the reference rings in any one reference ring group;

and the attenuation difference value operator unit is used for respectively calculating and obtaining the attenuation difference value between the reference rings in each reference ring group by using the measured transmission attenuation value and the theoretical transmission attenuation value.

Preferably, the compensation attenuation difference calculation unit includes:

the compensation measurement transmission attenuation value operator unit is used for adding the position compensation value of each reference ring group and the measurement transmission attenuation value between the reference rings in each reference ring group to obtain the compensation measurement transmission attenuation value of each reference ring group;

and the compensation attenuation difference value operator unit is used for calculating and obtaining the compensation attenuation difference value between the reference rings in each reference ring group by using the compensation measurement transmission attenuation value and the theoretical transmission attenuation value.

Preferably, the quantum measurement unit comprises:

the energy value measuring sub-unit is used for measuring and obtaining the radio frequency energy frequency point energy value and the uplink frequency point energy value between the first reference ring and the second reference ring of the second reference ring at a plurality of positions; wherein the plurality of positions are a coordinate origin at a geometric center of a first reference ring of the set of reference rings, and a second reference ring is disposed at a plurality of positions different from the first reference ring;

the first transmission attenuation value operator unit is used for calculating by utilizing the radio frequency energy frequency point energy values to obtain radio frequency energy frequency point measurement transmission attenuation values of the second reference ring at a plurality of positions;

and the second transmission attenuation value operator unit is used for calculating uplink frequency point measurement transmission attenuation values of the second reference ring at a plurality of positions by utilizing the uplink frequency point energy value.

Preferably, the energy value measurement sub-unit comprises:

the first energy value measuring unit is used for measuring and obtaining a 0-degree radio frequency energy frequency point energy value and a 0-degree uplink frequency point energy value between the first reference ring and the second reference ring;

and the second energy value measuring unit is used for measuring the 180-degree radio frequency energy frequency point energy value and the 180-degree uplink frequency point energy value between the first reference ring and the second reference ring after the second reference ring rotates 180 degrees in the horizontal plane without changing the position of the first reference ring.

Preferably, the theoretical value operator unit includes:

a first theoretical value calculating operator unit for utilizing

a second theoretical value calculating operator unit for utilizing

Preferably, the error value calculation unit includes:

a first uplink frequency point error value calculating operator unit for utilizing

a second uplink frequency point error value calculating operator unit for utilizing

a first RF energy frequency point error value calculating operator unit for utilizing

a second RF energy frequency point error value calculating operator unit for utilizing

Preferably, the position compensation value calculation unit includes:

the first average error value calculating operator unit is used for adding the 0-degree radio frequency energy frequency point error values of the current reference ring and then averaging the added 0-degree radio frequency energy frequency point error values to obtain the average 0-degree radio frequency energy frequency point error value of the current reference ring;

the first measurement error calculation subunit is used for adding the average radio frequency energy frequency point error values of the two reference rings forming the reference ring group to obtain the measurement error of the radio frequency energy frequency point of each reference ring group;

the first position compensation value calculation operator unit is used for calculating to obtain a radio frequency energy frequency point position compensation value of the current reference ring group by utilizing the position offset of two reference rings in the current reference ring group, the partial derivatives in three directions of a coordinate axis and the measurement error of the radio frequency energy frequency point of the current reference ring group; the second average error value calculating operator unit is used for adding the 0-degree uplink frequency point error values of the current reference ring and then averaging the added 0-degree uplink frequency point error values to obtain the average 0-degree uplink frequency point error value of the current reference ring;

the second measurement error calculation subunit is used for adding the average uplink frequency point error values of the two reference rings forming the reference ring group to obtain the measurement error of the uplink frequency point of each reference ring group;

and the second position compensation value operator unit is used for calculating to obtain the uplink frequency point position compensation value of the current reference ring group by utilizing the position offset of the two reference rings in the current reference ring group, the partial derivatives in three directions of the coordinate axis and the measurement error of the uplink frequency point of the current reference ring group.

Compared with the prior art, the technical scheme provided by the invention has the following advantages:

according to the technical scheme, N reference rings are selected; respectively calculating to obtain the attenuation difference value between the reference rings in each reference ring group; calculating to obtain an error value of the current reference ring by using an attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and an attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; calculating a position compensation value of each reference ring group by using the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group; calculating to obtain a compensation attenuation difference value between the reference rings in each reference ring group by using the position compensation value of each reference ring group and the attenuation difference value between the reference rings in each reference ring group; calculating to obtain a compensation error value of the current reference ring by using a compensation attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and a compensation attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; calculating a correction parameter of the current reference ring by using the compensation error value of the current reference ring; and calibrating the current reference ring according to the correction parameters of the current reference ring. The offset of the geometric center and the electrical center of the reference ring caused by the manufacturing of the reference ring is compensated to the calibration process of the reference ring, so that the calibration precision of the reference ring is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a flowchart of a method for calibrating a reference ring according to an embodiment of the present invention;

FIG. 2 is a flow chart of another method for calibrating a reference ring according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a reference ring calibration apparatus according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another reference ring calibration apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a flowchart of a reference ring calibration method according to an embodiment of the present invention is shown, where the reference ring calibration method includes:

s101, selecting N reference rings, wherein N is more than or equal to 3;

and randomly selecting N reference rings from the plurality of reference rings, wherein N is more than or equal to 3.

S102, respectively calculating to obtain attenuation difference values among the reference rings in each reference ring group; wherein the reference ring group consists of any two of the N reference rings;

and combining the selected N reference rings pairwise to form a plurality of reference ring groups. For example, when N ═ 3, i.e., the reference ring selected includes reference ring 1, reference ring 2, and reference ring 3. Wherein, reference ring 1 and reference ring 2 are combined to form reference ring group 1, reference ring 1 and reference ring 3 are combined to form reference ring group 2, and reference ring 2 and reference ring 3 are combined to form reference ring group 3.

For each reference ring set, the attenuation difference between the two reference rings constituting the reference ring set is calculated.

The attenuation difference between the reference ring 1 and the reference ring 2 of the reference ring set 1, the attenuation difference between the reference ring 1 and the reference ring 3 of the reference ring set 2, and the attenuation difference between the reference ring 2 and the reference ring 3 of the reference ring set 3 are calculated, respectively.

S103, calculating to obtain an error value of the current reference ring by using an attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and an attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; wherein the current reference ring is any one of the N reference rings;

when the current reference ring is the reference ring 1, the two reference rings forming the reference ring group 1 and the two reference rings forming the reference ring group 2 both include the reference ring 1, while the two reference rings forming the reference ring 3 do not include the reference ring 1, and an error value of the reference ring 1 is calculated by using an attenuation difference value between the reference rings of the reference ring group 1, an attenuation difference value between the reference rings of the reference ring group 2 and an attenuation difference value between the reference rings of the reference ring group 3;

the error value of the reference ring 2 and the error value of the reference ring 3 are calculated, respectively, in such a manner that the error value of the reference ring 1 is calculated.

S104, calculating a position compensation value of each reference ring group by using the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group;

due to the problems of materials or processes, a certain deviation exists between the electrical center of the manufactured reference ring and the geometric center of the reference ring, the electrical center refers to the center of the electromagnetic field characteristic presented by the reference ring, the geometric center refers to the geometric center of the external dimension of the reference ring, and the deviation exists between the two centers of the reference ring, so that the measurement result is influenced when the reference ring is used as an antenna.

In order to reduce the influence on the measurement results, it is necessary to eliminate the influence of the deviation between the electrical center and the geometric center. Although the geometric center can be measured intuitively, the electrical center of the reference ring cannot be measured directly. Therefore, for each reference ring, a coordinate system is established with its own geometric center as a coordinate origin, and positional offsets in three axial directions of the coordinate system are set in advance, wherein the positional offsets refer to differences in distances between the electrical center and the geometric center of the reference ring.

Taking three reference rings as an example for illustration, let devX1, devY1 and devZ1 be the offsets of the electrical center from the geometric center in three directions, respectively, of the reference ring 1. Similarly, reference ring 2 and reference ring 3 each have three identical offsets.

Setting the values of the above-mentioned 9 offsets, for example, the offsets of the reference ring 1 in the three directions are devX1 ═ 0.14mm, devY1 ═ -0.035mm, and devZ1 ═ 0.4mm, respectively; the offsets of the reference ring 2 in the three directions are devX2 ═ 0.11mm, devY2 ═ -0.08mm, devZ2 ═ 0.4mm, respectively; the offsets of the reference ring 3 in the three directions are devX3 ═ 0.07mm, devY3 ═ -0.06mm, and devZ3 ═ 0.55mm, respectively. Where devX1 ═ 0.14mm indicates that the electrical center of the reference ring 1 is shifted by 0.14mm in the positive direction of the x axis from the geometric center of the reference ring 1, devY1 ═ 0.035mm indicates that the electrical center of the reference ring 1 is shifted by 0.035mm in the negative direction of the Y axis from the geometric center of the reference ring 1, and devZ1 ═ 0.4mm indicates that the electrical center of the reference ring 1 is shifted by 0.4mm in the positive direction of the z axis from the geometric center of the reference ring 1. The other reference rings are the same.

In practical application, the offset of each reference ring in three directions is set according to the size of each reference ring. Specifically, when the reference ring has dimensions of 5mm thickness and 20mm width, the possible range of the offset is ± 2.5mm in the thickness direction and ± 10mm in the width direction.

Furthermore, since the distribution of the magnetic field is different at different placements, the magnitude of the offset is related to the placement of the reference ring.

And aiming at each reference ring group, calculating to obtain a position compensation value of each reference ring group by using the position offset of the two reference rings forming the reference ring group and the error value of the two reference rings forming the reference ring group. S105, calculating to obtain a compensation attenuation difference value between the reference rings in each reference ring group by using the position compensation value of each reference ring group and the attenuation difference value between the reference rings in each reference ring group;

s106, calculating to obtain a compensation error value of the current reference ring by using a compensation attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and a compensation attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group;

the calculation method of the compensation error value of the current reference ring is the same as the calculation method of the error value of the current reference ring in step S103, except that the attenuation difference value between the reference rings in the reference ring set used in step S103 is not position-compensated, and the attenuation difference value between the reference rings in the reference ring set used in step S106 is position-compensated.

S107, calculating a correction parameter of the current reference ring by using the compensation error value of the current reference ring;

and S108, calibrating the current reference ring according to the correction parameters of the current reference ring.

In the technical scheme provided by the embodiment of the invention, N reference rings are selected; respectively calculating to obtain the attenuation difference value between the reference rings in each reference ring group; calculating to obtain an error value of the current reference ring by using an attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and an attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; calculating a position compensation value of each reference ring group by using the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group; calculating to obtain a compensation attenuation difference value between the reference rings in each reference ring group by using the position compensation value of each reference ring group and the attenuation difference value between the reference rings in each reference ring group; calculating to obtain a compensation error value of the current reference ring by using a compensation attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and a compensation attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; calculating a correction parameter of the current reference ring by using the compensation error value of the current reference ring; and calibrating the current reference ring according to the correction parameters of the current reference ring. The offset of the geometric center and the electrical center of the reference ring caused by the manufacturing of the reference ring and the distribution change of the magnetic field after mutual inductance is compensated to the calibration process of the reference ring, so that the calibration precision of the reference ring is improved.

As shown in fig. 2, it shows a flowchart of another reference ring calibration method provided in an embodiment of the present invention, where the reference ring calibration method includes:

s201, selecting N reference rings, wherein N is more than or equal to 3;

s202, respectively measuring transmission attenuation among reference rings in each reference ring group to obtain a measured transmission attenuation value among the reference rings in each reference ring group;

and respectively connecting the two reference rings forming the reference ring group with two ports of the network analyzer by using the network analyzer, and then measuring a transmission attenuation value between the two reference rings by using the network analyzer to obtain a measured transmission attenuation value between the two reference rings in the reference ring group.

Preferably, step S202 includes:

S202A, setting a second reference ring at a plurality of positions different from the first reference ring by taking the geometric center of the first reference ring in the reference ring group as a coordinate origin;

for example, when the transmission attenuation between the reference rings in the reference ring set 1 is measured to obtain the measured transmission attenuation value between the reference rings in the reference ring set 1, a coordinate system is created with the geometric center of the reference ring 1 as a coordinate origin (z, x, y) ((0, 0, 0)), the geometric center of the reference ring 2 is placed at a first position of the coordinate system (z, x, y) ((220, -200, 0)), and then the geometric center of the reference ring 2 is placed at a second position different from the first position, thereby sequentially realizing the positioning of the reference ring 2 at a plurality of positions different from the reference ring 1.

Wherein, a plurality of positions of the reference ring 2 can be adjusted according to actual needs. The set position rarely affects the accuracy of the final result, and the set position increases the workload. In the present application, the reference ring 2 can be arranged in 43 different positions.

The 43 positions set with reference to ring 2 can be as shown in table 1:

S202B, measuring and obtaining radio frequency energy frequency point energy values and uplink frequency point energy values of the second reference ring between the first reference ring and the second reference ring at a plurality of positions;

wherein the measuring of the radio frequency energy frequency point energy value and the uplink frequency point energy value between the first reference ring and the second reference ring of the second reference ring at one position comprises:

s301, measuring to obtain a 0-degree radio frequency energy frequency point energy value and a 0-degree uplink frequency point energy value between the first reference ring and the second reference ring;

s302, rotating the second reference ring by 180 degrees in a horizontal plane while keeping the position of the first reference ring unchanged;

and S303, measuring to obtain a 180-degree radio frequency energy frequency point energy value and a 180-degree uplink frequency point energy value between the first reference ring and the second reference ring.

And completing the radio frequency energy frequency point energy value and the uplink frequency point energy value between the first reference ring and the second reference ring of the second reference ring at each position by executing the steps S302-S303.

Taking the example of obtaining the radio frequency energy frequency point energy value and the uplink frequency point energy value between the reference ring 1 and the reference ring 2 at the first position of the reference ring 2 by measurement, measuring the 0-degree radio frequency energy frequency point energy value and the 0-degree uplink frequency point energy value between the reference ring 1 and the reference ring 2 at the first position; the position of the reference ring 1 is unchanged, the reference ring 2 is rotated 180 degrees in the horizontal plane, and the 180-degree radio frequency energy frequency point energy value and the 180-degree uplink frequency point energy value between the reference ring 1 and the reference ring 2 at the first position are measured.

After the radio frequency energy frequency point energy value and the uplink frequency point energy value between the reference ring 1 and the reference ring 2 of the reference ring 2 at the first position are obtained through measurement, the reference ring 2 is arranged at a second position different from the first position, and the radio frequency energy frequency point energy value and the uplink frequency point energy value between the reference ring 1 and the reference ring 2 at the second position are measured; and repeating the operation until the radio frequency energy frequency point energy value and the uplink frequency point energy value between the reference ring 1 and the reference ring 2 at each position of the reference ring 2 are measured.

The measured 0-degree rf energy frequency point energy values and 0-degree uplink frequency point energy values between the reference ring 1 and the reference ring 2 at a plurality of positions are shown in table 2:

the measured 180-degree rf energy frequency point energy values and 180-degree uplink frequency point energy values between the reference ring 1 and the reference ring 2 at a plurality of positions also exist in the data table shown in table 2 above.

S202C, calculating to obtain measured radio frequency energy frequency point transmission attenuation values of the second reference ring at a plurality of positions by using the radio frequency energy frequency point energy values;

S202D, calculating and obtaining the transmission attenuation values of the uplink frequency points of the second reference ring at a plurality of positions by utilizing the energy values of the uplink frequency points.

S203, calculating transmission attenuation among reference rings in any one reference ring group to obtain a theoretical transmission attenuation value among the reference rings in any one reference ring group;

the theoretical transmission attenuation value is independent of the measured reference ring itself, and is only related to the measured frequency, the shape of the reference ring, and the distance between the two reference rings, so that after the reference rings are determined, the position between the two reference rings is determined, and the theoretical transmission attenuation value between the reference rings in any one reference ring group is the same after the measurement frequency is determined. In practical application, only the transmission attenuation between reference rings in any one reference ring group needs to be calculated to obtain a theoretical transmission attenuation value.

In particular, utilize

by using

Wherein, mutual inductance coefficients among the reference rings in one reference ring group at different positions are different. In particular, utilize

And calculating to obtain the mutual inductance coefficient. Wherein R represents the distance between two reference rings during integration, and the two reference rings are virtually divided during integrationAnd integrating the line segments on the two reference rings by using an infinite number of line segments, wherein R represents the distance between the two line segments for integration, and R is changed along with the change of the integration line segments during the integration process.

μ₀Is the magnetic permeability in the air and,

shown is the integration of the first reference loop curve,

shown is the integration over the second reference loop curve.

Preferably, E ═ 25 Ω.

S204, respectively calculating to obtain an attenuation difference value between reference rings in each reference ring group by using the measured transmission attenuation value and the theoretical transmission attenuation value;

calculating the 0-degree radio frequency energy frequency point energy value to obtain 0-degree measurement radio frequency energy frequency point transmission attenuation values of the second reference ring at a plurality of positions;

subtracting the transmission attenuation value of the radio frequency energy frequency point of 0 degree from the theoretical transmission attenuation value of the radio frequency energy frequency point to obtain the attenuation difference value of the radio frequency energy frequency point of 0 degree between the reference rings in each reference ring group;

calculating to obtain 0-degree measurement uplink frequency point transmission attenuation values of the second reference ring at a plurality of positions by using the 0-degree uplink frequency point energy value;

subtracting the transmission attenuation value of the uplink frequency point measured by 0 degree from the theoretical transmission attenuation value of the uplink frequency point to obtain the attenuation difference value of the uplink frequency point measured by 0 degree between the reference rings in each reference ring group;

calculating 180-degree measurement radio frequency energy frequency point transmission attenuation values of the second reference ring at a plurality of positions by using the 180-degree radio frequency energy frequency point energy values;

subtracting the transmission attenuation value of the radio frequency energy frequency point measured by 180 degrees from the theoretical transmission attenuation value of the radio frequency energy frequency point to obtain a 180-degree radio frequency energy frequency point attenuation difference value between reference rings in each reference ring group;

calculating by using the 180-degree uplink frequency point energy value to obtain 180-degree measurement uplink frequency point transmission attenuation values of the second reference ring at a plurality of positions;

and subtracting the transmission attenuation value of the uplink frequency point measured by 180 degrees from the theoretical transmission attenuation value of the uplink frequency point to obtain the attenuation difference value of the uplink frequency point measured by 180 degrees between the reference rings in each reference ring group.

S205, calculating to obtain an error value of the current reference ring by using an attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and an attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; wherein the current reference ring is any one of the N reference rings;

preferably, by using

wherein, error P (4, 0, k) represents the 0 degree uplink frequency point error value of the current reference ring P; n represents the number of the selected reference rings; k represents a position number; p represents the current reference ring, wherein the value range of P is from 1 to N; d1(P & i,4) represents the difference between the measured transmission attenuation value of 0 degree uplink frequency point between the reference ring P and the reference ring i and the theoretical transmission attenuation value of uplink frequency point between the reference ring P and the reference ring i, i.e., D1(P & i,4) represents the attenuation difference value of 0 degree uplink frequency point between the reference ring P and the reference ring i; the value range of i is from 1 to N, but since the transmission attenuation value between two reference rings is calculated, the two reference rings cannot be the same reference ring, i cannot take the value P.

Showing the reference ring in the reference ring set that will contain the current reference ring M of the two reference rings that make up the reference ring setAnd adding the attenuation difference values of the 0-degree uplink frequency points among the reference rings.

The sum of the 0 degree uplink frequency bin attenuation differences between the two reference rings that make up the reference ring set is shown.

The sum of the 0-degree uplink frequency point attenuation difference values between the reference rings in the reference ring group which does not contain the current reference ring M in the two reference rings in the reference ring group is shown.

When the number N of the selected reference rings is 3, a plurality of reference ring groups are formed, including: reference ring 1 and reference ring 2 are combined, reference ring 1 and reference ring 3 are combined, and reference ring 2 and reference ring 3 are combined.

When the current reference ring is reference ring 1, that is, when P is 1, calculating the 0-degree uplink frequency point error value of reference ring 1, using the formula

And (4) calculating.

For the 43 positions, a 0-degree uplink frequency point error value of one reference ring 1 is obtained at each position.

And repeating the steps, and respectively calculating to obtain a 0-degree uplink frequency point error value of the reference ring 2 and a 0-degree uplink frequency point error value of the reference ring 3.

Preferably, by using

wherein, error P (4, 180, k) represents a 180-degree uplink frequency point error value of the current reference ring P; n represents the number of the selected reference rings; k represents a position number; p represents the current reference ring, wherein the value range of P is from 1 to N; d2(P & i,4) represents the difference between the measured transmission attenuation value of the 180-degree uplink frequency point between the reference ring P and the reference ring i and the theoretical transmission attenuation value of the uplink frequency point between the reference ring P and the reference ring i, i.e., D2(P & i,4) represents the difference between the attenuation values of the 180-degree uplink frequency point between the reference ring P and the reference ring i; the value range of i is from 1 to N, but since the transmission attenuation value between two reference rings is calculated, the two reference rings cannot be the same reference ring, i cannot take the value P.

It is shown that the 180-degree uplink frequency point attenuation difference values between the reference rings in the reference ring group including the current reference ring P among the two reference rings constituting the reference ring group are added.

The sum of the 180-degree uplink frequency bin attenuation differences between the two reference rings that make up the reference ring set is shown.

The sum of the 180-degree uplink frequency point attenuation difference values between the reference rings in the reference ring group which does not contain the current reference ring P in the two reference rings in the reference ring group is shown.

When the current reference ring is reference ring 1, that is, when P is 1, the 180-degree uplink frequency point error value of reference ring 1 is calculated, using the formula

And (4) calculating.

For the 43 positions, a 180-degree uplink frequency point error value of one reference ring 1 is obtained at each position.

And repeating the steps, and respectively calculating to obtain a 180-degree uplink frequency point error value of the reference ring 2 and a 180-degree uplink frequency point error value of the reference ring 3.

Preferably, by using

wherein, the error P (27, 0, k) represents the error value of the 0-degree radio frequency energy frequency point of the current reference ring P; n represents the number of the selected reference rings; k represents a position number; p represents the current reference ring, wherein the value range of P is from 1 to N; d3(P & i,27) represents the difference between the measured transmission attenuation value of the 0-degree radio frequency energy frequency point between the reference ring P and the reference ring i and the theoretical transmission attenuation value of the radio frequency energy frequency point between the reference ring P and the reference ring i, i.e. D3(P & i,27) represents the attenuation difference value of the 0-degree radio frequency energy frequency point between the reference ring P and the reference ring i; the value range of i is from 1 to N, but since the transmission attenuation value between two reference rings is calculated, the two reference rings cannot be the same reference ring, i cannot take the value P.

The method is characterized in that 0-degree radio frequency energy frequency point attenuation difference values between reference rings in a reference ring group containing a current reference ring P in two reference rings in a reference ring group are added.

The sum of the attenuation differences of the 0-degree radio frequency energy frequency points between two reference rings in the reference ring group is shown.

The sum of the attenuation difference values of 0-degree radio frequency energy frequency points between the reference rings in the reference ring group which does not contain the current reference ring P in the two reference rings in the reference ring group is shown.

When the current reference ring is the reference ring 1, that is, when P is 1, calculating the 0-degree rf energy frequency point error value of the reference ring 1, using the formula

And (4) calculating.

And aiming at the 43 positions, obtaining 0-degree radio frequency energy frequency point error values of one reference ring 1 at each position.

And repeating the steps, and respectively calculating to obtain a 0-degree radio frequency energy frequency point error value of the reference ring 2 and a 0-degree radio frequency energy frequency point error value of the reference ring 3.

Preferably, by using

wherein, ErrorP (27, 180, k) represents the 180-degree radio frequency energy frequency point error value of the current reference ring P; n represents the number of the selected reference rings; k represents a position number; p denotes the current reference ring; wherein the value range of P is from 1 to N; d4(P & i,27) represents the difference between the 180-degree radio frequency energy frequency point measurement transmission attenuation value between the reference ring P and the reference ring i and the radio frequency energy frequency point theoretical transmission attenuation value between the reference ring M and the reference ring i, namely D4(P & i,27) represents the 180-degree radio frequency energy frequency point attenuation difference value between the reference ring P and the reference ring i; the value range of i is from 1 to N, but since the transmission attenuation value between two reference rings is calculated, the two reference rings cannot be the same reference ring, i cannot take the value P.

The method is characterized in that 180-degree radio frequency energy frequency point attenuation difference values between reference rings in a reference ring group containing a current reference ring M in two reference rings in a reference ring group are added.

The sum of the 180-degree rf energy bin attenuation differences between the two reference rings comprising the reference ring set is shown.

The sum of the 180-degree radio frequency energy frequency point attenuation difference values between the reference rings in the reference ring group which does not contain the current reference ring P in the two reference rings in the reference ring group is shown.

When the current reference ring is the reference ring 1, that is, when P is 1, calculating the 180-degree rf energy frequency point error value of the reference ring 1, using the formula

And (4) calculating.

And aiming at the 43 positions, obtaining 180-degree radio frequency energy frequency point error values of one reference ring 1 at each position.

And repeating the steps, and respectively calculating to obtain a 180-degree radio frequency energy frequency point error value of the reference ring 2 and a 180-degree radio frequency energy frequency point error value of the reference ring 3.

S206, calculating a position compensation value of each reference ring group by using the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group; after step S205 is executed, a 0-degree radio frequency energy frequency point error value, a 180-degree radio frequency energy frequency point error value, a 0-degree uplink frequency point error value, and a 180-degree uplink frequency point error value of the current reference ring are obtained.

The calculating of the position compensation value of each reference ring group comprises:

S206A, adding the 0-degree radio frequency energy frequency point error values of the current reference ring and then averaging to obtain an average 0-degree radio frequency energy frequency point error value of the current reference ring;

for example, if there are 43 test positions K equal to 1, 2, 3, … …, 43, then the formula is used

Calculating to obtain an average 0-degree radio frequency energy frequency point error value of the current reference ring;

using formulas

Calculating to obtain an average 180-degree radio frequency energy frequency point error value of the current reference ring;

using formulas

Calculating to obtain an average radio frequency energy frequency point error value of the current reference ring;

S206B, adding the average radio frequency energy frequency point error values of the two reference rings forming the reference ring group to obtain the measurement error of the radio frequency energy frequency point of each reference ring group;

after the step S206A, obtaining average radio frequency energy frequency point error values of the current reference ring, and adding the average radio frequency energy frequency point error values of the two reference rings constituting a reference ring group to obtain a measurement error of the radio frequency energy frequency point of each reference ring group because one reference ring group is composed of two reference rings;

when the number of the selected reference rings is N, the number of the reference ring groups obtained by combining every two reference rings is N

Calculate this separately

And measuring errors of radio frequency energy frequency points of the reference ring groups.

When the number of reference rings is determined, a combined list can be built, as shown in table 3:

where T denotes the number of the reference ring group.

According to table 3, the measurement error of the rf energy frequency point of each reference ring group is calculated by using the formula BTtele ═ Btelei + Btelej.

Taking N ═ 3 as an example, the reference ring group formed includes a reference ring group 1(T ═ 1) formed by combining the reference ring 1 and the reference ring 2, a reference ring group 2(T ═ 2) formed by combining the reference ring 1 and the reference ring 3, and a reference ring group 3(T ═ 3) formed by combining the reference ring 2 and the reference ring 3.

Adding the average radio frequency energy frequency point error value of the reference ring 1 to the average radio frequency energy frequency point error value of the reference ring 2, and calculating to obtain the measurement error of the radio frequency energy frequency point of the reference ring group 1; adding the average radio frequency energy frequency point error value of the reference ring 1 to the average radio frequency energy frequency point error value of the reference ring 3, and calculating to obtain the measurement error of the radio frequency energy frequency point of the reference ring group 2; and adding the average radio frequency energy frequency point error value of the reference ring 2 to the average radio frequency energy frequency point error value of the reference ring 3, and calculating to obtain the measurement error of the radio frequency energy frequency point of the reference ring group 3.

S206C, calculating to obtain a radio frequency energy frequency point position compensation value of each reference ring group by using the position offset and the partial derivative value of each reference ring in each reference ring group and the measurement error of the radio frequency energy frequency point of each reference ring group;

in step S203 using

Calculating to obtain the radio frequency energy between the reference rings in any one reference ring groupTransmitting attenuation values by a frequency point theory; wherein use is made of

The mutual inductance M is calculated, and R represents the distance between the two reference rings in the integration process.

During integration, two reference rings are virtually divided into an infinite number of line segments, the line segments on the two reference rings are integrated, R represents the distance between the two line segments for integration, and R varies with the variation of the integration line segments during the integration process.

Assuming that the reference ring is shifted by 1cm only in the X-axis direction, the theoretical transmission attenuation value shifted by 1cm in the X-axis direction is calculated by using the formula for calculating the theoretical transmission attenuation value in step S203, so as to obtain the theoretical transmission attenuation value a 2' of the radio frequency energy frequency point.

The difference between a 2' and a2 is the attenuation difference per unit length of the offset in the X-axis direction, and this is taken as the offset in the X-axis direction.

Similarly, the partial derivatives in the other two axial directions are calculated.

Because the two reference rings are placed at different positions, the mutual inductance coefficient between the two reference rings is different, and the calculated theoretical transmission attenuation values between the two reference rings are also different, the partial derivatives in the directions of the X axis, the Y axis and the Z axis between the two reference rings at different positions are different. With the above method, the partial derivatives in the X-axis, Y-axis, and Z-axis directions between the two reference rings at each position are calculated, respectively.

Taking reference ring group 1 composed of reference ring 1 and reference ring 2 as an example, a way of calculating a radio frequency energy frequency point position compensation value of each reference ring group is described.

Calculating to obtain a 0-degree radio frequency energy frequency point position compensation value of the reference ring group 1 by using C (27, 1) - (ZDev × del1Z × sign (Z) + Ydev × del1Y × sign (Y) + XDev × del1X × sign (X)) -BLtele;

wherein, B1tele represents the measurement error of the radio frequency energy frequency point of the reference ring group 1;

wherein Zdev, Ydev, and Xdev represent the partial derivatives in three directions between two reference rings in the reference ring set 1;

wherein del1Z ═ devZ1+ devZ 2; devZ1 indicates the offset of reference ring 1 in the Z-axis direction, devZ2 indicates the offset of reference ring 2 in the Z-axis direction, del1Z indicates the total amount of offset of the electrical center between the two reference rings of reference ring set 1 compared to the geometric center; devZ1 and devZ2 are both signed values;

del1Y ═ devY1+ devY 2; devY1 indicates the offset of reference ring 1 in the Y-axis direction, devY2 indicates the offset of reference ring 2 in the Y-axis direction, del1Y indicates the total amount of offset of the electrical center between two reference rings of reference ring set 1 compared to the geometric center; devY1 and devY2 are both signed numbers;

del1X ═ devX1-devX 2; devX1 indicates the offset of reference ring 1 in the X-axis direction, devX2 indicates the offset of reference ring 2 in the X-axis direction, del1X indicates the total amount of offset of the electrical center between two reference rings of reference ring set 1 compared to the geometric center; devX1 and devX2 are both signed numbers;

when the two reference rings are at an angle of 0 degree, the Z-axis directions of the two reference rings are opposite, the Y-axis directions are opposite, and the X-axis directions are the same, so when the total offset amount of the electrical center between the two reference rings compared with the geometric center is calculated, the total offset amount in the Z-axis direction is the sum of the offset amounts of the two reference rings, the total offset amount in the Y-axis direction is the sum of the offset amounts of the two reference rings, and the total offset amount in the X-axis direction is the subtraction of the offset amounts of the two reference;

sign (Z) denotes the sign of the Z-axis in the coordinate position of the second reference ring relative to the first reference ring in a reference ring set;

sign (Y) denotes the sign of the Y-axis in the coordinate position of the second reference ring relative to the first reference ring in a reference ring set;

sign (X) denotes the sign of the X-axis in the coordinate position of the second reference ring relative to the first reference ring in a reference ring set;

for example, as shown in table 1, for the reference ring set 1, the reference ring 2 may be disposed at 43 positions, taking the first position (x, y, z) ═ 0, -200,220 as an example, sign (z) ═ 1, sign (y) ═ 1, sign (x) ═ 1;

similarly, a 180-degree radio frequency energy frequency point position compensation value of the reference ring group 1 can be obtained through calculation;

and sequentially calculating to obtain the 0-degree radio frequency energy frequency point position compensation value and the 180-degree radio frequency energy frequency point position compensation value of each other reference ring group according to the method for calculating the 0-degree radio frequency energy frequency point position compensation value and the 180-degree radio frequency energy frequency point position compensation value of the reference ring group 1.

S206D, adding the 0-degree uplink frequency point error values of the current reference ring and then averaging to obtain an average 0-degree uplink frequency point error value of the current reference ring;

for example, if there are 43 test positions, i.e., K is 1, 2, 3, … …, 43, then the formula is used

Calculating to obtain an average 0-degree uplink frequency point error value of the current reference ring;

using formulas

Calculating to obtain an average 180-degree uplink frequency point error value of the current reference ring;

using formulas

Calculating to obtain an average uplink frequency point error value of the current reference ring;

S206E, adding the average uplink frequency point error values of the two reference rings forming the reference ring group to obtain the measurement error of the uplink frequency point of each reference ring group;

after step S206D, obtaining an average uplink frequency point error value of the current reference ring, and adding the average uplink frequency point error values of the two reference rings constituting a reference ring group to obtain a measurement error of the uplink frequency point of each reference ring group, because one reference ring group is composed of two reference rings;

Calculate this separately

And measuring errors of uplink frequency points of the reference ring groups.

Referring to table 3 above, the measurement error of the uplink frequency point of each reference ring set is calculated by using the formula BTup ═ Bupi + Bupj.

Adding the average uplink frequency point error value of the reference ring 1 to the average uplink frequency point error value of the reference ring 2, and calculating to obtain the measurement error of the uplink frequency point of the reference ring group 1; adding the average uplink frequency point error value of the reference ring 1 to the average uplink frequency point error value of the reference ring 3, and calculating to obtain the measurement error of the uplink frequency point of the reference ring group 2; and adding the average uplink frequency point error value of the reference ring 2 to the average uplink frequency point error value of the reference ring 3, and calculating to obtain the measurement error of the uplink frequency point of the reference ring group 3.

S206F, calculating the uplink frequency point position compensation value of each reference ring group by using the position offset and the partial derivative value of each reference ring in each reference ring group and the measurement error of the uplink frequency point of each reference ring group;

in step S203 using

Calculating to obtain theoretical transmission attenuation values of uplink frequency points between reference rings in any one reference ring group; wherein use is made of

Here, the partial derivatives are the same as those at the respective positions calculated in the above step S206C, and the partial derivatives calculated in the step S206C can be used as they are to perform the corresponding calculation.

Taking reference ring group 1 composed of reference ring 1 and reference ring 2 as an example, a manner of calculating an uplink frequency point position compensation value of each reference ring group will be described.

Calculating a 0-degree uplink frequency point position compensation value of the reference ring group 1 by using C (4, 1) — (ZDev × del1Z × sign (Z) + Ydev × del1Y × sign (Y) + XDev × del1X × sign (X)) -BLtele;

wherein, B1tele represents the measurement error of the uplink frequency point of the reference ring group 1;

similarly, a 180-degree uplink frequency point position compensation value of the reference ring group 1 can be obtained through calculation;

and sequentially calculating to obtain a 0-degree uplink frequency point position compensation value and a 180-degree uplink frequency point position compensation value of each other reference ring group according to a method for calculating the 0-degree uplink frequency point position compensation value and the 180-degree uplink frequency point position compensation value of the reference ring group 1.

S207, calculating to obtain a compensation attenuation difference value between the reference rings in each reference ring group by using the position compensation value of each reference ring group and the attenuation difference value between the reference rings in each reference ring group;

the attenuation difference between the reference rings in each reference ring set is calculated by subtracting the measured transmission attenuation value from the theoretical transmission attenuation value. Adding the calculated 0-degree radio frequency energy frequency point position compensation value, 180-degree radio frequency energy frequency point position compensation value, 0-degree uplink frequency point position compensation value and 180-degree uplink frequency point position compensation value of each reference ring group to the 0-degree measurement radio frequency energy frequency point transmission attenuation value, 180-degree measurement radio frequency energy frequency point transmission attenuation value, 0-degree measurement uplink frequency point transmission attenuation value and 180-degree measurement uplink frequency point transmission attenuation value between the reference rings in each corresponding reference ring group to obtain the 0-degree compensation measurement radio frequency energy frequency point transmission attenuation value, 180-degree compensation measurement radio frequency energy frequency point transmission attenuation value, 0-degree compensation measurement uplink frequency point transmission attenuation value and 180-degree compensation measurement uplink frequency point transmission attenuation value of each reference ring group; and respectively utilizing the 0-degree compensation measurement radio frequency energy frequency point transmission attenuation value, the 180-degree compensation measurement radio frequency energy frequency point transmission attenuation value, the 0-degree compensation measurement uplink frequency point transmission attenuation value, the 180-degree compensation measurement uplink frequency point transmission attenuation value and the theoretical transmission attenuation value of each reference ring group, and calculating to obtain a 0-degree compensation radio frequency energy frequency point attenuation difference value, a 180-degree compensation radio frequency energy frequency point attenuation difference value, a 0-degree compensation uplink frequency point attenuation difference value and a 180-degree compensation uplink frequency point attenuation difference value among the reference rings in each reference ring group.

S208, calculating to obtain a compensation error value of the current reference ring by using a compensation attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and a compensation attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group;

the calculation method of the compensation error value of the current reference ring in this step is the same as the calculation method of the error value of the current reference ring in step S205, and the compensation error value of the current reference ring can be calculated by replacing the attenuation difference value in step S205 with the compensation attenuation difference value.

Taking three reference rings as an example, the 0 degree test results obtained are shown in table 4:

taking three reference rings as an example, the 180 degree test results obtained are shown in table 5:

namely, 0-degree radio frequency energy frequency point compensation error values, 180-degree radio frequency energy frequency point compensation error values, 0-degree uplink frequency point compensation error values and 180-degree uplink frequency point compensation error values of the first reference ring in each reference ring group at a plurality of positions of the second reference ring are obtained.

S209, calculating a correction parameter of the current reference ring by using the compensation error value of the current reference ring;

after the compensation error value of each reference ring is obtained by utilizing the steps, the compensation effect needs to be judged;

taking the results of table 4 and table 5 obtained in step S208 as an example, after obtaining the 0-degree rf energy frequency point compensation error value, the 180-degree rf energy frequency point compensation error value, the 0-degree uplink frequency point compensation error value, and the 180-degree uplink frequency point compensation error value of each reference ring at a plurality of positions, the standard deviation of each compensation error value, the maximum value and the minimum value of each compensation error value, and the average value of each compensation error value are calculated by using the compensation error values, respectively.

The compensation error values of Table 4 were used to calculate the results shown in Table 6:

the compensation error values of Table 5 were used to calculate the results shown in Table 7:

and calculating to obtain the root mean square of the standard deviation by using the standard deviation corresponding to the 0-degree uplink error value, the standard deviation corresponding to the 180-degree uplink error value, the standard deviation corresponding to the 0-degree radio frequency energy error value and the standard deviation corresponding to the 180-degree radio frequency energy error value of all the reference rings. Specifically, the root mean square of the standard deviation was calculated using 12 standard deviations shown in tables 6 and 7 herein. The root mean square of the standard deviation obtained by calculation is a parameter for evaluating the compensation effect, and the smaller the root mean square of the standard deviation is, the better the compensation effect is.

The calculated average value is another parameter for evaluating the compensation effect, and the closer the average value is to 0, the better the compensation effect is;

step S209 specifically includes:

S209A, judging whether the compensation error value of the current reference ring meets a first preset condition;

the first preset condition refers to whether the root mean square of the standard deviation is in a first interval, wherein the setting of the first interval can be adjusted according to actual needs, and the range of the first interval determines the accuracy of calibration;

calculating to obtain the root mean square of the standard deviation according to the compensation error value of each reference ring, and judging whether the root mean square of the standard deviation is in a first interval or not;

if the root mean square of the standard deviation is not in the first interval, selecting a position offset different from the last time within a first preset range, adjusting the position offset of any reference ring in any direction, taking the adjusted position offset as a new position offset of the reference ring, and returning to execute the step S206;

the position offset of which reference ring is specifically adjusted can be adjusted according to actual needs, the position offset of one or more reference rings can be adjusted by one-time adjustment, and the position offset of the reference ring in one direction can be adjusted only or the position offsets of the reference rings in multiple directions can be adjusted simultaneously; and the value of the adjustment may be arbitrarily chosen within the first predetermined range.

When the root mean square of the standard deviation increases compared to the root mean square of the standard deviation calculated last time, it is considered that the adjustment of the position deviation amount causes the position deviation amount to be away from the true position deviation amount.

For example, the position deviation amount of the Z axis is set to be [2.5,7.5], and the initial value of the position deviation amount of the reference ring in the Z axis direction is set to be 5 mm. On the basis, the position offset amount of the reference ring in the X-axis direction and the position offset amount of the reference ring in the Y-axis direction are adjusted.

Specifically, a dichotomy adjustment may be adopted, for example, if the value range of devX1 is [ -1, +1], three values of-1, 0, +1 may be obtained first during the adjustment, and if it is determined that the root mean square of the standard deviation calculated from the position offset amount of 1 is larger than the root mean square of the standard deviation calculated from the position offset amounts of 0 and-1, it is considered that the position offset amount is far from the true position offset amount when the value of the position offset amount is 1. Then, the value range is narrowed to [ -1,0] and the value is-0.5 at the midpoint between-1 and 0 in the next readjustment. And comparing the root mean square of the standard deviation obtained by calculation according to the calculated position offset of-0.5 with the root mean square of the standard deviation calculated by the range boundaries of-1 and 0, and reducing the value range again until the root mean square of the minimum standard deviation is found. According to the dichotomy, values are traversed in the value range of the position offset.

If the adjustment in the X-axis and Y-axis directions is completed for the reference ring, and the position offset satisfying the first predetermined condition is not found yet, the position offset of the reference ring in the Z-axis direction is adjusted by using the bisection method.

If the root mean square of the standard deviation is within the first interval, then S209B is performed;

S209B, judging whether the compensation error value of the current reference ring meets a second preset condition;

the second predetermined condition refers to whether the average value corresponding to the 0-degree uplink error value, the average value corresponding to the 180-degree uplink error value, the average value corresponding to the 0-degree radio frequency energy error value and the average value corresponding to the 180-degree radio frequency energy error value corresponding to all the reference rings are all in a second interval, wherein the setting of the second interval can be adjusted according to actual needs, and the range of the second interval determines the calibration accuracy; calculating to obtain an error average value of each reference ring according to the compensation error value of each reference ring, and judging whether each error average value is in a second interval;

if the error average values are not within the second interval, selecting an error value different from the last reference ring within a second predetermined range, adjusting the error value of any reference ring, taking the adjusted error value as a new error value of the reference ring, and returning to execute the step S206;

wherein, the initial value of the error value of the reference ring is the error value of the reference ring calculated in step S205; the error value for adjusting the reference ring in the second interval may be the initial error value of the reference ring plus a set step value, and the specific step value may be set according to actual needs; preferably, the step value is set to 0.01 dB;

the error value adjustment for the reference ring may be to adjust the error value of any one or more reference rings, or may be to preferentially adjust the reference ring whose error average value is not in the second interval; if the error averages are within the second interval, executing S209C;

S209C, judging whether the compensation error value of the current reference ring meets a third preset condition;

the third predetermined condition is used for judging whether the judgment on the compensation effect is finished, and the third predetermined condition can be whether the maximum value of the compensation error values of all the reference rings and the minimum value of the compensation error values of all the reference rings are in a third interval, wherein the setting of the third interval can be adjusted according to actual needs, and the range of the third interval determines the calibration accuracy; preferably, the third interval may be set to [ -0.5dB, +0.5dB ];

searching the maximum value of the compensation error values of all the reference rings to obtain the maximum value of the compensation error values of all the reference rings, searching the minimum value of the minimum values of the compensation error values of all the reference rings to obtain the minimum value of the compensation error values of all the reference rings, and judging whether the maximum value of the compensation error values of all the reference rings and the minimum value of the compensation error values of all the reference rings are in a third interval or not;

if the maximum value of the compensation error value and the minimum value of the compensation error value are not both in the third interval, judging whether the position offset of the reference ring traverses the value in the first preset range or not and whether the error value of the reference ring traverses the value in the second preset range or not;

specifically, if the first predetermined range is [ -1mm, +1mm ], the step length is 0.5mm, and the initial position offset is 0mm, it is determined whether the position offset of the reference ring traverses-1 mm, -0.5mm, 0mm, +1mm, +0.5mm, and the traversing methods in the second predetermined range are the same;

if the value of the position offset traverses the first predetermined range and the value of the error value traverses the second predetermined range, expanding the first predetermined range, taking the expanded first predetermined range as a new first predetermined range, adjusting the position offset of the reference ring in the new first predetermined range, taking the adjusted position offset of the reference ring as a new position offset, and returning to execute the step S206;

it can be understood that, when the value of the position offset traverses the first predetermined range and the value of the error value traverses the second predetermined range, the first predetermined range may be expanded, the second predetermined range may also be expanded, the error value of any reference ring may be adjusted within the second predetermined range, and the adjusted error value of the reference ring is used as a new error value of the reference ring;

if the value of the position offset does not traverse the first predetermined range or the value of the error value does not traverse the second predetermined range, continuing to execute the steps of adjusting the position offset of any reference ring in the first predetermined range and adjusting the error value of any reference ring in the second predetermined range, taking the adjusted position offset as the position offset of two reference rings in the set reference ring group, and taking the adjusted error value of the reference ring as the error value of the two reference rings in the calculated reference ring group; returning to execute step S206;

for example, if the value of the position offset does not traverse the first predetermined range, assuming that the first predetermined range is [ -1mm, +1mm ], the step size is 0.5mm, and if the value of the position offset is already-1 mm, -0.5mm, 0mm, but not +1mm, +0.5mm, the position offset continues to be adjusted within the first predetermined range [ -1mm, +1mm ], i.e., the position offset may be +1mm, +0.5 mm; at this time, the value of the error value is still within the second predetermined range, so that when the position offset is +1mm and +0.5mm, the value can be combined with all the error values within the second predetermined range respectively.

And if the maximum value of the compensation error value and the minimum value of the compensation error value are both in a third interval, calculating the correction parameter of the current reference ring by using the compensation error value of the current reference ring. If the maximum value of the compensation error value and the minimum value of the compensation error value are both in the third interval, the traversal condition is finished, and the position offset of the compensation error value meeting the condition is the offset distance between the geometric center and the electrical center of the reference ring;

calculating a correction parameter of the current reference ring by using a compensation error value which enables the compensation error value to meet the condition;

wherein calculating the correction parameter of the current reference ring comprises:

adding the 0-degree radio frequency energy frequency point compensation error values of the current reference ring and then averaging to obtain an average 0-degree radio frequency energy frequency point compensation error value of the current reference ring;

adding the 180-degree radio frequency energy frequency point compensation error values of the current reference ring and then averaging to obtain an average 180-degree radio frequency energy frequency point compensation error value of the current reference ring;

adding the average 0-degree radio frequency energy frequency point compensation error value of the current reference ring and the average 180-degree radio frequency energy frequency point compensation error value of the current reference ring, and averaging to obtain an average radio frequency energy frequency point compensation error value of the current reference ring;

here, the method for calculating the average radio frequency energy frequency point compensation error value of the current reference ring is the same as the method for calculating the average radio frequency energy frequency point error value of the current reference ring in step S206A, and the average radio frequency energy frequency point compensation error value of the current reference ring can be calculated by replacing the error value in step S206A with the compensation error value;

adding the average radio frequency energy frequency point compensation error values of two reference rings forming a reference ring group to obtain a compensation measurement error of the radio frequency energy frequency point of each reference ring group;

the method for calculating the compensation measurement error of the radio frequency energy frequency point of each reference ring group is the same as the method for calculating the measurement error of the radio frequency energy frequency point of each reference ring group in step S206B, and the compensation measurement error of the radio frequency energy frequency point of each reference ring group can be calculated by replacing the error value in step S206B with the compensation error value;

replacing the error value in the step S206D with a compensation error value, and calculating to obtain an average uplink frequency point compensation error value of the current reference ring;

replacing the average uplink frequency point error value in the step S206E with an average uplink frequency point compensation error value, and calculating to obtain a compensation measurement error of the uplink frequency point of each reference ring group;

calculating correction parameters of the radio frequency energy frequency points of the current reference ring by using the compensation measurement errors of the radio frequency energy frequency points of the reference ring group including the current reference ring in the two reference rings forming the reference ring group and the compensation measurement errors of the radio frequency energy frequency points of the reference ring group not including the current reference ring in the two reference rings forming the reference ring group;

taking the current reference ring P as an example for explanationAs can be seen from table 3, the set of reference ring groups including the current reference ring P may be represented as (i ═ P) ∪ (j ═ P), where the set of T values, which are sequence numbers of the reference ring groups mapped by the set (i ═ P) ∪ (j ═ P), is Z, and ∑ is used to determine the set of T values_T∈ZB' Ttel calculates the sum of the compensation measurement errors of the radio frequency energy frequency points of the reference ring group containing the current reference ring P.

By using

And calculating to obtain the sum of the compensation measurement errors of the radio frequency energy frequency points of all the reference ring groups.

By using

And calculating to obtain the sum of the compensation measurement errors of the radio frequency energy frequency points of the reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group.

By using

Calculating to obtain a correction parameter of the radio frequency energy frequency point of the current reference ring P;

and calculating to obtain the correction parameters of the uplink frequency points of the current reference ring by utilizing the compensation measurement errors of the uplink frequency points of the reference ring group which contains the current reference ring in the two reference rings forming the reference ring group and the compensation measurement errors of the uplink frequency points of the reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group.

Taking the current reference ring P as an example, as can be seen from table 3, the set of reference ring groups including the current reference ring P may be represented as (i ═ P) ∪ (j ═ P), where the set of T values, which are sequence numbers of the reference ring groups mapped by the set (i ═ P) ∪ (j ═ P), is Z, and ∑ is used to indicate that the set of T values is Z_T∈ZAnd B' Tup calculates to obtain the sum of the compensation measurement errors of the uplink frequency points of the reference ring group containing the current reference ring P.

By using

And calculating to obtain the sum of the compensation measurement errors of the uplink frequency points of all the reference ring groups.

By using

And calculating to obtain the sum of the compensation measurement errors of the uplink frequency points of the reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group.

By using

And calculating to obtain the correction parameters of the uplink frequency point of the current reference ring P.

And S2010, calibrating the current reference ring according to the correction parameters of the current reference ring.

Specifically, when the current reference loop is used as an antenna for receiving or transmitting signals, the current value on the current reference loop is measured, and then the measured current value on the reference loop is multiplied by the correction parameter, so that the obtained current value is the current value in the actual space.

In the technical scheme provided by the embodiment of the invention, N reference rings are selected; respectively calculating to obtain the attenuation difference value between the reference rings in each reference ring group; calculating to obtain an error value of the current reference ring by using an attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and an attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; calculating a position compensation value of each reference ring group by using the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group; calculating to obtain a compensation attenuation difference value between the reference rings in each reference ring group by using the position compensation value of each reference ring group and the attenuation difference value between the reference rings in each reference ring group; calculating to obtain a compensation error value of the current reference ring by using a compensation attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and a compensation attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; calculating a correction parameter of the current reference ring by using the compensation error value of the current reference ring; and calibrating the current reference ring according to the correction parameters of the current reference ring. The offset of the geometric center and the electrical center of the reference ring caused by the manufacturing of the reference ring is compensated to the calibration process of the reference ring, so that the calibration precision of the reference ring is improved.

Corresponding to the reference ring calibration method shown in fig. 1, the present invention further provides a reference ring calibration apparatus, and a schematic structural diagram thereof is shown in fig. 3, where the reference ring calibration apparatus provided in this embodiment includes: a selection unit 11, an attenuation difference calculation unit 12, an error value calculation unit 13, a position compensation value calculation unit 14, a compensation attenuation difference calculation unit 15, a compensation error value calculation unit 16, a correction parameter calculation unit 17, and a calibration unit 18.

A selecting unit 11, configured to select N reference rings, where N is greater than or equal to 3;

an attenuation difference calculation unit 12, configured to calculate and obtain an attenuation difference between reference rings in each reference ring group; wherein the reference ring group consists of any two of the N reference rings;

an error value calculation unit 13, configured to calculate an error value of the current reference ring by using an attenuation difference value between reference rings in a reference ring group including the current reference ring among two reference rings constituting the reference ring group and an attenuation difference value between reference rings in a reference ring group not including the current reference ring among the two reference rings constituting the reference ring group; wherein the current reference ring is any one of the N reference rings;

a position compensation value calculating unit 14, configured to calculate a position compensation value of each reference ring group by using the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group;

a compensation attenuation difference calculation unit 15, configured to calculate a compensation attenuation difference between reference rings in each reference ring group by using the position compensation value of each reference ring group and an attenuation difference between reference rings in each reference ring group;

a compensation error value calculation unit 16, configured to calculate a compensation error value of the current reference ring by using a compensation attenuation difference value between reference rings in a reference ring group including the current reference ring among two reference rings constituting the reference ring group, and a compensation attenuation difference value between reference rings in a reference ring group not including the current reference ring among the two reference rings constituting the reference ring group; a correction parameter calculation unit 17, configured to calculate a correction parameter of the current reference ring by using the error value of the current reference ring;

and the calibration unit 18 is configured to calibrate the current reference ring according to the correction parameter of the current reference ring.

The embodiment discloses a reference ring calibration device, which selects N reference rings through a selection unit; the attenuation difference calculation unit respectively calculates and obtains the attenuation difference between the reference rings in each reference ring group; the error value calculation unit calculates and obtains an error value of the current reference ring by using an attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and an attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; the position compensation value calculation unit calculates and obtains a position compensation value of each reference ring group by using the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group; the compensation attenuation difference calculation unit calculates and obtains the compensation attenuation difference between the reference rings in each reference ring group by using the position compensation value of each reference ring group and the attenuation difference between the reference rings in each reference ring group; the compensation error value calculation unit calculates and obtains a compensation error value of the current reference ring by using a compensation attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and a compensation attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; the correction parameter calculation unit calculates the correction parameter of the current reference ring by using the compensation error value of the current reference ring; and the calibration unit calibrates the current reference ring according to the correction parameter of the current reference ring. The calibration method can calibrate the measured value of the reference ring by the correction coefficient of the reference ring calculated by the reference ring calibration device, and compared with the calibration method which can only eliminate the artificial error of the reference ring through multiple times of measurement in the prior art, the calibration method can eliminate the influence of the system error of the reference ring on the measurement result. And the offset of the geometric center and the electrical center of the reference ring caused by the manufacturing of the reference ring is compensated to the calibration process of the reference ring, so that the calibration precision of the reference ring is improved.

Referring to fig. 4, which shows another structural schematic diagram of a reference ring calibration apparatus according to an embodiment of the present application, the correction parameter calculation unit 17 in fig. 3 includes: a first judgment unit 17A, a second judgment unit 17B, a third judgment unit 17C, and a correction parameter calculation subunit 17D.

A first judging unit 17A, configured to judge whether the compensation error value of the current reference ring satisfies a first predetermined condition;

a second judging unit 17B configured to judge whether the compensation error value of the current reference ring satisfies a second predetermined condition when the first judging unit judges that the first predetermined condition is satisfied;

a third judging unit 17C, configured to, when the second judging unit judges that the second predetermined condition is satisfied, judge whether the compensation error value of the current reference ring satisfies a third predetermined condition;

and a correction parameter calculating subunit 17D, configured to calculate a correction parameter of the current reference ring by using the compensation error value of the current reference ring when the third determining unit determines that the third predetermined condition is met.

The compensation attenuation difference calculation unit 15 includes: the compensation measurement transmission attenuation value calculation subunit and the compensation attenuation difference value calculation subunit are connected.

The attenuation difference calculation unit 12 includes: a measurement subunit 21, a theoretical value calculation subunit 22 and an attenuation difference calculation subunit 23.

A measuring subunit 21, configured to measure transmission attenuation between reference rings in each reference ring group, respectively, to obtain a measured transmission attenuation value between reference rings in each reference ring group;

a theoretical value calculating operator unit 22, configured to calculate transmission attenuation between reference rings in any one reference ring group, so as to obtain a theoretical transmission attenuation value between reference rings in any one reference ring group;

and an attenuation difference calculation subunit 23, configured to calculate and obtain an attenuation difference between the reference rings in each reference ring group by using the measured transmission attenuation value and the theoretical transmission attenuation value.

Preferably, the measurement subunit 21 includes: an energy value measurement sub-unit 21A, a first transmission attenuation value operator unit 21B and a second transmission attenuation value operator unit 21C.

The energy value measuring subunit 21A is configured to measure and obtain radio frequency energy frequency point energy values and uplink frequency point energy values between the first reference ring and the second reference ring of the second reference ring at multiple positions; wherein the plurality of positions are a coordinate origin at a geometric center of a first reference ring of the set of reference rings, and a second reference ring is disposed at a plurality of positions different from the first reference ring;

a first transmission attenuation value calculation operator unit 21B, configured to calculate, using the radio frequency energy frequency point energy values, to obtain radio frequency energy frequency point measurement transmission attenuation values of the second reference ring at multiple positions;

and a second transmission attenuation value calculation subunit 21C, configured to calculate uplink frequency point measurement transmission attenuation values of the second reference ring at multiple positions by using the uplink frequency point energy value.

Preferably, the energy value measuring sub-unit 21A includes: a first energy value measuring unit and a second energy value measuring unit.

Preferably, the theoretical value operator unit 22 comprises: a first theoretical value operator unit and a second theoretical value operator unit.

A first theoretical value calculating operator unit for utilizing

a second theoretical value calculating operator unit for utilizing

The error value calculation unit 13 includes: a first uplink frequency point error value calculation operator unit 13A, a second uplink frequency point error value calculation operator unit 13B, a first radio frequency energy frequency point error value calculation operator unit 13C and a second radio frequency energy frequency point error value calculation operator unit 13D.

A first uplink frequency point error value calculating operator unit 13A for utilizing

wherein the content of the first and second substances,

ErrorP (4, 0, k) represents the 0 degree uplink frequency point error value of the current reference ring P; n represents the number of the selected reference rings; p denotes the current reference ring; d1() represents the difference between the measured transmission attenuation value of 0 degree uplink frequency point between two reference rings in the reference ring set and the theoretical transmission attenuation value of uplink frequency point between two reference rings in the reference ring set; k represents a position number;

Calculating to obtain 180 degrees of the current reference ringAn uplink frequency point error value;

Preferably, the position compensation value calculation unit 14 includes: a first average error value calculation operator unit 14A, a first measurement error calculation operator unit 14B, a first position compensation value calculation operator unit 14C, a second average error value calculation operator unit 14D, a second measurement error calculation operator unit 14E, and a second position compensation value calculation operator unit 14F.

The first average error value calculating operator unit 14A is configured to add the 0-degree radio frequency energy frequency point error values of the current reference ring and then average the added values to obtain an average 0-degree radio frequency energy frequency point error value of the current reference ring;

the first measurement error calculation subunit 14B is configured to add the average radio frequency energy frequency point error values of the two reference rings that form the reference ring group, so as to obtain a measurement error of the radio frequency energy frequency point of each reference ring group;

the first position compensation value calculation operator unit 14C is configured to calculate a radio frequency energy frequency point position compensation value of the current reference ring group by using position offsets of two reference rings in the current reference ring group, partial derivatives in three directions of a coordinate axis, and a measurement error of a radio frequency energy frequency point of the current reference ring group;

a second average error value calculation operator unit 14D, configured to add the 0-degree uplink frequency point error values of the current reference ring and then average the added values to obtain an average 0-degree uplink frequency point error value of the current reference ring;

a second measurement error calculation subunit 14E, configured to add the average uplink frequency point error values of the two reference rings that form a reference ring group, to obtain a measurement error of an uplink frequency point of each reference ring group;

and the second position compensation value operator unit 14F is configured to calculate an uplink frequency point position compensation value of the current reference ring group by using the position offsets of the two reference rings in the current reference ring group, the partial derivatives in three directions of the coordinate axis, and the measurement error of the uplink frequency point of the current reference ring group.

In the reference ring calibration apparatus disclosed in this embodiment, N reference rings are selected by a selection unit; the attenuation difference calculation unit respectively calculates and obtains the attenuation difference between the reference rings in each reference ring group; the error value calculation unit calculates and obtains an error value of the current reference ring by using an attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and an attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; the position compensation value calculation unit calculates and obtains a position compensation value of each reference ring group by using the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group; the compensation attenuation difference calculation unit calculates and obtains the compensation attenuation difference between the reference rings in each reference ring group by using the position compensation value of each reference ring group and the attenuation difference between the reference rings in each reference ring group; the compensation error value calculation unit calculates and obtains a compensation error value of the current reference ring by using a compensation attenuation difference value between reference rings in a reference ring group which contains the current reference ring in two reference rings forming the reference ring group and a compensation attenuation difference value between reference rings in a reference ring group which does not contain the current reference ring in the two reference rings forming the reference ring group; the correction parameter calculation unit calculates the correction parameter of the current reference ring by using the compensation error value of the current reference ring; and the calibration unit calibrates the current reference ring according to the correction parameter of the current reference ring. The calibration method can calibrate the measured value of the reference ring by the correction coefficient of the reference ring calculated by the reference ring calibration device, and compared with the calibration method which can only eliminate the artificial error of the reference ring through multiple times of measurement in the prior art, the calibration method can eliminate the influence of the system error of the reference ring on the measurement result. And the offset of the geometric center and the electrical center of the reference ring caused by the manufacturing of the reference ring is compensated to the calibration process of the reference ring, so that the calibration precision of the reference ring is improved.

It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the method class embodiment, since it is basically similar to the apparatus embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the apparatus embodiment.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A method of reference ring calibration, the method comprising:

selecting N reference rings, wherein N is more than or equal to 3;

calibrating the current reference ring according to the correction parameters of the current reference ring;

wherein the calculating the correction parameter of the current reference ring by using the compensation error value of the current reference ring comprises:

2. The method of claim 1, wherein said separately calculating the attenuation difference between the reference rings in each reference ring set comprises:

3. The method of claim 2, wherein the calculating the compensated attenuation difference between the reference rings in each reference ring group by using the position compensation value of each reference ring group and the attenuation difference between the reference rings in each reference ring group comprises:

4. The method of claim 2, wherein the measuring the transmission attenuation between the reference rings in each reference ring group respectively to obtain the measured transmission attenuation value between the reference rings in each reference ring group comprises:

5. The method of calibrating a reference ring according to claim 4, wherein the measuring the RF energy bin energy value and the uplink bin energy value between the first reference ring and the second reference ring at a position of the second reference ring comprises:

6. The method according to claim 5, wherein the calculating the transmission attenuation between the reference rings in any one of the reference ring sets to obtain the theoretical transmission attenuation value between the reference rings in any one of the reference ring sets comprises:

by using

by using

wherein, A2 represents the theoretical transmission attenuation value of the radio frequency energy frequency point between the reference rings in a reference ring group; ω 2 ═ 2 π × f, f ═ 27 MHz; m represents the mutual inductance between the reference rings in a reference ring set; e represents a resistance constant;

by using

Calculating to obtain mutual inductance coefficient, wherein R represents the distance between two reference rings during integration, μ₀Is the magnetic permeability in the air and,

shown is the integration of the first reference loop curve,

shown is the integration over the second reference loop curve.

7. The method for calibrating reference rings according to claim 6, wherein the calculating the error value of the current reference ring by using the attenuation difference between the reference rings in the reference ring group including the current reference ring among the two reference rings constituting the reference ring group and the attenuation difference between the reference rings in the reference ring group not including the current reference ring among the two reference rings constituting the reference ring group comprises:

by using

by using

by using

by using

8. The method according to claim 7, wherein the calculating the position compensation value of each reference ring group by using the set position offset of the two reference rings in each reference ring group and the calculated error value of the two reference rings in each reference ring group comprises:

9. A reference ring calibration apparatus, the apparatus comprising:

the calibration unit is used for calibrating the current reference ring according to the correction parameters of the current reference ring;

wherein the correction parameter calculation unit includes:

10. The reference ring calibration device according to claim 9, wherein the attenuation difference calculation unit comprises:

11. The reference ring calibration device according to claim 10, wherein the compensation attenuation difference calculation unit comprises:

12. The reference ring calibration device of claim 11, wherein the quantum measurement unit comprises:

13. The reference ring calibration device of claim 12, wherein the energy value measurement sub-unit comprises:

14. The reference ring calibration device according to claim 13, wherein the theoretical value operator unit comprises:

a first theoretical value calculating operator unit for utilizing

a second theoretical value calculating operator unit for utilizing

by using

shown is the integration of the first reference loop curve,

shown is the integration over the second reference loop curve.

15. The reference ring calibration device according to claim 10, wherein the error value calculation unit comprises:

16. The reference ring calibration device according to claim 11, wherein the position compensation value calculating unit includes: