CN110531176B - Active antenna TRP rapid measurement method - Google Patents

Active antenna TRP rapid measurement method Download PDF

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CN110531176B
CN110531176B CN201910762560.3A CN201910762560A CN110531176B CN 110531176 B CN110531176 B CN 110531176B CN 201910762560 A CN201910762560 A CN 201910762560A CN 110531176 B CN110531176 B CN 110531176B
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trp
active antenna
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杜刘革
邱现允
孔凡敏
赵佳
王士铨
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Shanghai Manguang Information Technology Co ltd
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Abstract

The invention belongs to the technical field of communication, and relates to a method for measuring an antenna TRP. A rapid measurement method of active antenna TRP is characterized in that: the method comprises the following steps: installing an active antenna on a rotary table to be tested, and connecting the active antenna with instrument equipment; measuring EIRP distribution data of a main polarization horizontal section to obtain; measuring main polarization vertical section EIRP distribution data to obtain; calculating full spherical EIRP data; TRP values were calculated from global face EIRP data. The active antenna TRP rapid measurement method provided by the invention only needs to measure two main section EIRP directional diagrams in the measurement, three-dimensional EIRP data can be generated by the two main section directional diagrams by utilizing a three-dimensional directional diagram synthesis formula, then the TRP value of the active antenna is obtained according to a summation formula, and the three-dimensional measurement is reduced to two-dimensional measurement, so that the time required by sampling is greatly reduced, the measurement speed is accelerated, errors can be reduced, and the accuracy of the TRP measurement value is improved.

Description

Active antenna TRP rapid measurement method
Technical Field
The invention belongs to the technical field of communication, and relates to a method for measuring an antenna TRP.
Background
With the development of 5G mobile communication, large-scale Multiple Input Multiple Output (MIMO) antenna arrays are generally concerned, and due to the improvement of the requirement of integration level, the MIMO antenna system has highly integrated a radio frequency processing part and a front-end antenna to form an active antenna system, which cannot separate a passive part of the antenna, and cannot directly measure the gain of the antenna, but Total Radiated Power (TRP) thereof can be used as an important index for measuring the radiation performance thereof, so that the measurement of TRP is very important in the development and production of active antennas.
At present, in The aspect of TRP measurement of an active antenna, a mobile communication terminal antenna has a relevant standard, that is, in an Air interface (Over The Air, OTA) measurement darkroom, a Theta-Phi coordinate system turntable is used to rotate a spherical surface, Effective Isotropic Radiated Power (EIRP) at each angle is measured and obtained, and then a summation operation is performed according to formula (1) to obtain a TRP value.
Figure BDA0002170848350000011
Wherein,
Figure BDA0002170848350000012
and
Figure BDA0002170848350000013
are respectively a measuring point
Figure BDA0002170848350000014
And theta polarization of
Figure BDA0002170848350000015
Polarized EIRP values, N and M being respectively in the theta direction and
Figure BDA0002170848350000016
the number of directional sampling points. Usually, the cross polarization radiation power of the antenna is very small relative to the main polarization, so if the main polarization rotation measurement mode is adopted, the TRP value can be calculated by adopting the formula (2).
Figure BDA0002170848350000017
Wherein,
Figure BDA0002170848350000018
is the main polarized EIRP value.
Because the mobile communication terminal antenna is generally small in size and wide in directional diagram, the sampling angle interval can be large, but the scanning of two polarizations of the whole sphere of a plurality of channels is still time-consuming. Chinese patent ZL201310158536.1, a method for quickly testing TRP of a terminal antenna, discloses a quick measurement method using EIRP of a certain channel to compensate other channels, but still requires a spherical scanning process.
In addition, for an active base station antenna, especially a massive MIMO antenna, its directional pattern is narrow, side lobes are more, and if sampling is performed with a larger angle interval (e.g. 30 ° in the chinese patent ZL 201310158536.1), its TRP measurement error will be large. Therefore, the sampling interval must be reduced, and the number of measurement points increases to n times the square of the sampling interval of two angular dimensions every time the sampling interval is reduced by n times, which will greatly increase the measurement time, for example, the theta interval and
Figure BDA00021708483500000212
the interval is reduced to 1 deg., the obtained TRP value is more accurate, but 180X 360 points are needed to be sampled, and the time is increased by 900 times compared with the sampling at 30 deg., so that the research of a rapid measuring method is needed.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide a rapid measurement method for the TRP of an active antenna, which only needs to scan two angular dimensions of the whole spherical surface, can greatly shorten the measurement time, and can reduce errors and improve the accuracy of the TRP measurement value.
The technical scheme adopted by the invention for solving the technical problems is as follows: an active antenna TRP rapid measurement method comprises the following steps:
installing an active antenna on a rotary table to be tested, and connecting the active antenna with instrument equipment;
measuring the EIRP distribution data of the main polarization horizontal section to obtain
Figure BDA0002170848350000021
Measuring main polarization vertical section EIRP distribution data to obtain
Figure BDA0002170848350000022
Computing full sphere EIRP data
Figure BDA0002170848350000023
According to the global EIRP data
Figure BDA0002170848350000024
Calculating the TRP value.
In a preferred embodiment of the present invention, the global EIRP data is
Figure BDA0002170848350000025
Is/are as follows
The calculation formula is as follows:
Figure BDA0002170848350000026
wherein,
Figure BDA0002170848350000027
is a symbolic representation of the result of the synthesis Algorithm, SA is an abbreviation for Sum Algorithm, and the subscript dB indicates that EIRP is expressed as a logarithmic value
Figure BDA0002170848350000028
Figure BDA00021708483500000213
Indicating an EIRP pattern in a horizontal plane of
Figure BDA0002170848350000029
As a function of (a) or (b),
Figure BDA00021708483500000210
is the vertical plane EIRP pattern, is a function of θ, Max represents the maximum.
In a second preferred embodiment of the present invention, the global EIRP data
Figure BDA00021708483500000211
The calculation formula of (2) is as follows:
Figure BDA0002170848350000031
wherein,
Figure BDA0002170848350000032
is a symbolic representation of the result of the weighted synthesis algorithm, we refers to weight, k is an exponential coefficient, w1 and w2 are weight coefficients,
Figure BDA0002170848350000033
the subscript Un indicates the normalized EIRP pattern,
Figure BDA0002170848350000034
is a normalized EIRP directional diagram,
Figure BDA0002170848350000035
Is a horizontal tangent normalized EIRP directional diagram.
In a third preferred embodiment of the present invention, the global EIRP data
Figure BDA0002170848350000036
The calculation formula of (2) is as follows:
Figure BDA0002170848350000037
wherein,
Figure BDA0002170848350000038
and
Figure BDA0002170848350000039
as shown in formulas (3) and (4), w3 is a weighting coefficient, can be between values (0-1), and can be adjusted
Figure BDA00021708483500000310
And
Figure BDA00021708483500000311
hyb is an abbreviation for hybrid.
As a further improvement of the invention, the TRP value calculation formula is as follows:
Figure BDA00021708483500000312
wherein,
Figure BDA00021708483500000313
as the EIRP value of the global plane
Figure BDA00021708483500000314
According to the rapid measurement method for the TRP of the active antenna, only two main section EIRP directional diagrams need to be measured during measurement, three-dimensional EIRP data can be generated from the two main section directional diagrams by using a three-dimensional directional diagram synthesis formula, and the TRP value of the active antenna is obtained according to a summation formula, so that the three-dimensional measurement can be reduced to two-dimensional measurement. For example, sampling is performed according to a 1 ° sampling interval, a conventional measurement method requires 360 × 180 points, while the measurement method of the present invention only requires 360+360 points, which not only greatly reduces the time required for sampling, accelerates the measurement speed, but also can reduce errors and improve the accuracy of the TRP measurement value.
Drawings
Fig. 1 is a flow chart of the active antenna TRP fast measurement method of the present invention.
Detailed Description
The method of the present invention will be described in detail below with reference to the accompanying drawings and examples to enable those skilled in the art to better understand the technical idea of the present invention, but the technical idea of the present invention is not limited to the contents described in the specific examples.
The active antenna TRP rapid measurement method of the present embodiment has a flow as shown in fig. 1, and specifically includes:
1. installing an active antenna on a turntable to be measured, and connecting instrument equipment according to a traditional EIRP measuring mode;
2. the EIRP distribution data of the main polarization horizontal section is measured at the angle interval of 1 degree to obtain
Figure BDA0002170848350000041
(2) The EIRP distribution data of the main polarization vertical section is measured at the angle interval of 1 degree to obtain
Figure BDA0002170848350000042
3. Calculating the global EIRP value
Figure BDA0002170848350000043
The three-dimensional directional diagram generated by the tangential directional diagram has three general formulas, and any one of the three formulas can be calculated
Figure BDA0002170848350000044
(1) The first is a summation algorithm, i.e.:
Figure BDA0002170848350000045
wherein
Figure BDA0002170848350000046
Is a symbolic representation of the result of the synthesis Algorithm, SA is an abbreviation for Sum Algorithm, and the subscript dB indicates that EIRP is expressed as a logarithmic value
Figure BDA0002170848350000047
Figure BDA0002170848350000048
Indicating an EIRP pattern in a horizontal plane of
Figure BDA0002170848350000049
As a function of (a) or (b),
Figure BDA00021708483500000410
is the vertical plane EIRP pattern, is a function of θ, Max represents the maximum.
(2) The second is a weighted synthesis algorithm, i.e.:
Figure BDA00021708483500000411
wherein,
Figure BDA00021708483500000412
is a symbolic representation of the result of the weighted synthesis algorithm, we refers to weight, k is an exponential coefficient, w1 and w2 are weight coefficients,
Figure BDA00021708483500000413
the subscript Un indicates the normalized EIRP pattern,
Figure BDA00021708483500000414
is a normalized EIRP directional diagram,
Figure BDA00021708483500000415
Is a horizontal tangent normalized EIRP directional diagram.
(3) The third is a hybrid synthesis algorithm, i.e.:
Figure BDA0002170848350000051
wherein
Figure BDA0002170848350000052
And
Figure BDA0002170848350000053
as shown in formulas (3) and (4), w3 is a weighting coefficient, can be between values (0-1), and can be adjusted
Figure BDA0002170848350000054
And
Figure BDA0002170848350000055
hyb is an abbreviation for hybrid.
4. To obtain EIRP
Figure BDA0002170848350000056
After distribution of coordinates, i.e. global EIRP values
Figure BDA0002170848350000057
The TRP value can be obtained by using the formula (2).

Claims (2)

1. A rapid measurement method of active antenna TRP is characterized in that: the method comprises the following steps:
installing an active antenna on a rotary table to be tested, and connecting the active antenna with instrument equipment;
measuring the EIRP distribution data of the main polarization horizontal section to obtain
Figure FDA0002944201470000011
Measuring main polarization vertical section EIRP distribution data to obtain
Figure FDA0002944201470000012
Computing full sphere EIRP data
Figure FDA0002944201470000013
According to the global EIRP data
Figure FDA0002944201470000014
Calculating a TRP value;
the full sphere EIRP data
Figure FDA0002944201470000015
Adopt the followingEither method calculates out:
Figure FDA0002944201470000016
wherein,
Figure FDA0002944201470000017
is a symbolic representation of the result of the synthesis Algorithm, SA is an abbreviation for Sum Algorithm, and the subscript dB indicates that EIRP is expressed as a logarithmic value
Figure FDA0002944201470000018
Figure FDA0002944201470000019
Indicating an EIRP pattern in a horizontal plane of
Figure FDA00029442014700000110
As a function of (a) or (b),
Figure FDA00029442014700000111
is the vertical plane EIRP directional diagram, which is a function of θ; max represents the maximum value;
or:
Figure FDA00029442014700000112
wherein,
Figure FDA00029442014700000113
is a symbolic representation of the result of the weighted synthesis algorithm, we refers to weight, k is an exponential coefficient, w1 and w2 are weight coefficients,
Figure FDA00029442014700000114
the subscript Un denotes the normalized EIRP pattern，
Figure FDA00029442014700000115
Is a normalized EIRP directional diagram,
Figure FDA00029442014700000116
Is a horizontal tangent plane normalized EIRP directional diagram;
or:
Figure FDA00029442014700000117
wherein,
Figure FDA00029442014700000118
and
Figure FDA00029442014700000119
as shown in formulas (3) and (4), w3 is a weighting coefficient, can be between 0 and 1, and can be adjusted
Figure FDA0002944201470000021
And
Figure FDA0002944201470000022
hyb is an abbreviation for hybrid.
2. The active antenna TRP fast measurement method according to claim 1, characterized in that: the TRP value calculation formula is as follows:
Figure FDA0002944201470000023
wherein,
Figure FDA0002944201470000024
for world wide EIRP data
Figure FDA0002944201470000025
Figure FDA0002944201470000026
For measuring the coordinates of the points, N and M are respectively in the theta direction and
Figure FDA0002944201470000027
the number of directional sampling points; sin thetaiIs the sine of the ith sample point in the theta direction.
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