CN113708853B - Impedance mismatch correction method and device for antenna group delay measurement - Google Patents
Impedance mismatch correction method and device for antenna group delay measurement Download PDFInfo
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Abstract
The invention discloses an impedance mismatch correction method and device for antenna group delay measurement, which are applied to an antenna measurement system and comprise the following steps: respectively acquiring phase functions of all antenna measurement subsystems in the antenna measurement system; respectively calculating group delay of each antenna measurement subsystem based on the phase function; generating a group delay measurement equation set of the whole antenna measurement system based on the group delay; acquiring a first phase change value, a second phase change value and a third phase change value of the system in each antenna measurement subsystem; obtaining a first group delay measurement error, a second group delay measurement error and a third group delay measurement error based on the first, second and third phase change values; based on a group delay measurement equation set of the antenna measurement system and the first group delay measurement errors, the second group delay measurement errors and the third group delay measurement errors, obtaining a total mismatch correction factor; and carrying out impedance mismatch correction on the group delay measurement result of the antenna to be detected based on the total mismatch correction factor.
Description
Technical Field
The invention relates to the technical field of antenna group delay measurement, in particular to an impedance mismatch correction method and device for antenna group delay measurement.
Background
The antenna performance is described by parameters such as group delay, gain, pattern, standing wave ratio and the like, wherein the group delay not only determines the size of network transmission delay of the system, but also influences signal transmission distortion and transmission quality of the system, and particularly for a satellite navigation positioning system, the antenna group delay is an important delay amount in the system, directly determines the positioning accuracy of the system and is one of key parameters of the system. Impedance mismatch is a situation frequently encountered in the radio measurement field, and for group delay measurement, as the phase of a received signal is changed, so that a group delay measurement error is caused, and an uncertainty component is generated, a perfect impedance mismatch correction method for antenna group delay measurement needs to be provided.
Disclosure of Invention
Therefore, the invention aims to overcome the defect that in the prior art, measurement errors caused by impedance mismatch in the antenna group delay measurement process are not corrected, and further provides an impedance mismatch correction method and device for antenna group delay measurement.
According to a first aspect, an embodiment of the present invention discloses an impedance mismatch correction method for antenna group delay measurement, which is applied to an antenna measurement system, the antenna measurement system includes: a first antenna measurement subsystem, a second antenna measurement subsystem, and a third antenna measurement subsystem, the method comprising: respectively obtaining a phase function of each antenna measurement subsystem in the antenna measurement system, wherein the phase function is calculated by the sum of phase functions of antennas contained in the corresponding antenna measurement subsystem, the phase function of the antenna measurement subsystem and the distance phase function; respectively calculating the group delay of each antenna measurement subsystem based on the phase function of each antenna measurement subsystem; generating a group delay measurement equation set of the antenna measurement system based on the group delay of each antenna measurement subsystem; acquiring a first phase change value of a receiving end, a second phase change value of a transmitting end and a third phase change value of an antenna measurement subsystem in each antenna measurement subsystem; calculating to obtain corresponding first group delay measurement errors, second group delay measurement errors and third group delay measurement errors based on the first phase change value, the second phase change value and the third phase change value; based on the group delay measurement equation set of the antenna measurement system and the first group delay measurement error, the second group delay measurement error and the third group delay measurement error, obtaining a total mismatch correction factor; and carrying out impedance mismatch correction on the group delay of the antenna to be detected based on the total mismatch correction factor.
Optionally, the process of obtaining the first phase change value of the receiving end in the measurement subsystem of each antenna includes: based on an equivalent network model of a receiving end of each antenna measurement subsystem, respectively acquiring a first signal output by a receiving antenna of each antenna measurement subsystem and a second signal received by the receiving end; and calculating the first phase change value based on the first signal and the second signal of each antenna measurement subsystem respectively.
Optionally, the first phase change value is calculated by the following formula:
wherein b+a is the second signal received by the receiving end, E is the first signal output by the receiving antenna, Γ RA For receiving the antenna reflection coefficient Γ RP Is the reflection coefficient of the receiving end;
calculating the first group delay measurement error by the following formula:
where Δf is the frequency difference.
Optionally, a directional coupler is disposed between a signal source of the antenna measurement system and a transmitting antenna, and the process of obtaining the second phase change value of the transmitting end in each antenna measurement subsystem includes: based on an equivalent network model of the transmitting end of each antenna measurement subsystem, respectively acquiring a first signal and a second received signal which are output by the transmitting end of each antenna measurement subsystem; wherein the first signal is an output signal of the directional coupler; and calculating the second phase change value based on the first signal and the second signal of each antenna measurement subsystem respectively.
Optionally, the second phase change value is calculated by the following formula:
wherein a is 2 +b 2 For receiving the second signal, E' is the first signal output by the transmitting end, Γ TP For the reflection coefficient of the transmitting end in the equivalent network model, Γ TA For the reflection coefficient of the transmitting antenna Γ D Port reflectance of cable connected to coupling end of directional coupler, b 3 For the directional coupler 3 port to output signals S 21 、S 22 、S 23 、S 31 And S is 33 S parameters among ports of the directional coupler;
calculating the second group delay measurement error by the following formula:
where Δf is the frequency difference.
Optionally, the process of obtaining the third phase change value of the antenna measurement subsystem itself includes:
based on the straight-through measurement equivalent network model of each antenna measurement subsystem, respectively acquiring a first signal output by a transmitting end of each antenna measurement subsystem and a second signal received by a receiving end; and calculating the third phase change value based on the first signal and the second signal of each antenna measurement subsystem respectively.
Optionally, the third phase change value is calculated by the following formula:
wherein a is 2 +b 2 For the second signal received by the receiving end, E' is the first signal output by the transmitting end, Γ TP S is the reflection coefficient of the transmitting end in the equivalent network model 12 For the reverse transmission coefficient S 21 Is a forward transmission coefficient, S 11 To input the reflection coefficient S 22 To output the reflection coefficient Γ RP Is the reflection coefficient of the receiving end;
calculating the third group delay measurement error by the following formula:
where Δf is the frequency difference.
Optionally, based on the group delay measurement equation set of the antenna measurement system and the first group delay measurement error, the second group delay measurement error, and the third group delay measurement error, obtaining the total mismatch correction factor includes: respectively acquiring a first phase function of a receiving end after mismatch correction, a second phase function of a transmitting end after mismatch correction and a third phase function of the receiving end after mismatch correction of each antenna measurement subsystem; based on the first phase function, the second phase function and the third phase function after mismatch correction, a phase function equation after mismatch correction of each antenna measurement subsystem is obtained; obtaining a group delay measurement equation after the mismatch correction of each subsystem based on the phase function equation; based on the group delay measurement equation after the mismatch correction of each measurement subsystem, the total mismatch correction factor is obtained by simultaneous equation set.
Optionally, the antenna operating frequency band of each antenna measurement subsystem in the antenna measurement system is the same.
According to a second aspect, the embodiment of the invention also discloses an impedance mismatch correction device for antenna group delay measurement, which is applied to an antenna measurement system and comprises: the first acquisition module is used for respectively acquiring the phase function of each antenna measurement subsystem in the antenna measurement system, wherein the phase function is calculated by the sum of the phase functions of the antennas contained in the corresponding antenna measurement subsystem, the phase function of the antenna measurement subsystem and the distance phase function; the first calculation module is used for calculating the group delay of each antenna measurement subsystem based on the phase function of each antenna measurement subsystem; the system comprises a measurement equation set generating module, a group delay measuring equation set generating module and a group delay measuring module, wherein the measurement equation set generating module is used for generating a group delay measuring equation set of each antenna measuring subsystem; the second acquisition module is used for acquiring a first phase change value of a receiving end, a second phase change value of a transmitting end and a third phase change value of the antenna measurement subsystem in each antenna measurement subsystem; the second calculation module is used for calculating corresponding first group delay measurement errors, second group delay measurement errors and third group delay measurement errors based on the first phase change value, the second phase change value and the third phase change value; the third calculation module is used for obtaining a total mismatch correction factor based on the group delay measurement equation set of the antenna measurement subsystem, the first group delay measurement error, the second group delay measurement error and the third group delay measurement error; and the correction module is used for carrying out impedance mismatch correction on the group delay of the antenna to be detected based on the total mismatch correction factor.
According to a third aspect, an embodiment of the present invention further discloses an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the steps of an impedance mismatch correction method for antenna group delay measurement as described in the first aspect or any of the alternative embodiments of the first aspect.
According to a fourth aspect, the embodiments of the present invention also disclose a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of an impedance mismatch correction method for antenna group delay measurement according to the first aspect or any of the alternative embodiments of the first aspect.
The technical scheme of the invention has the following advantages:
the invention provides an impedance mismatch correction method and device for antenna group delay measurement and electronic equipment, wherein the method is applied to an antenna measurement system and comprises the following steps: respectively acquiring a phase function of each antenna measurement subsystem in the antenna measurement system; respectively calculating the group delay of each antenna measurement subsystem based on the phase function; generating a group delay measurement equation set of the antenna measurement system based on the group delay; acquiring a first phase change value of a receiving end, a second phase change value of a transmitting end and a third phase change value of the antenna measurement subsystem in each antenna measurement subsystem; calculating corresponding first group delay measurement errors, second group delay measurement errors and third group delay measurement errors based on the first phase change value, the second phase change value and the third phase change value; based on a group delay measurement equation set and a first group delay measurement error, a second group delay measurement error and a third group delay measurement error of the antenna measurement system, obtaining a total mismatch correction factor; and carrying out impedance mismatch correction on the group delay of the antenna to be detected based on the total mismatch correction factor. In the embodiment of the invention, the antenna group delay measurement system is established, the measurement error of the antenna group delay is obtained through measurement and calculation, and the impedance mismatch correction is carried out on the antenna to be measured according to the measurement error, so that the correct group delay measurement value is obtained, and the performance of the antenna is accurately described.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a specific example of an antenna measurement system in accordance with an embodiment of the present invention;
fig. 2 is a flowchart of a specific example of an impedance mismatch correction method for antenna group delay measurement according to an embodiment of the present invention;
fig. 3 is an equivalent network model of a specific example of an impedance mismatch correction method for antenna group delay measurement in an embodiment of the present invention;
fig. 4 is an equivalent network model of a specific example of an impedance mismatch correction method for antenna group delay measurement in an embodiment of the present invention;
fig. 5 is an equivalent network model of a specific example of an impedance mismatch correction method for antenna group delay measurement in an embodiment of the present invention;
Fig. 6 is an equivalent network model of a specific example of an impedance mismatch correction method for antenna group delay measurement in an embodiment of the present invention;
fig. 7 is a schematic block diagram of a specific example of an impedance mismatch correction device for antenna group delay measurement according to an embodiment of the present invention;
fig. 8 is a diagram illustrating an embodiment of an electronic device according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The embodiment of the invention discloses an impedance mismatch correction method for antenna group delay measurement, which can be applied to an antenna measurement system 101 shown in fig. 1 when being implemented, wherein the antenna measurement system 101 comprises: a first antenna measurement subsystem 1011, a second antenna measurement subsystem 1012, and a third antenna measurement subsystem 1013. As shown in fig. 2, the method comprises the steps of:
Step 201, respectively obtaining a phase function of each antenna measurement subsystem in the antenna measurement system, where the phase function is calculated by a sum of phase functions of antennas included in the corresponding antenna measurement subsystem, a phase function of the antenna measurement subsystem, and a distance phase function.
The antenna measurement system is composed of an antenna c to be measured and two auxiliary antennas a and b, wherein the working frequency bands of the three antennas a, b and c are the same, and the three antenna measurement subsystems of the antenna measurement system are shown in table 1, so that the auxiliary antenna a and the receiving antenna b form a first antenna measurement subsystem; the auxiliary antenna a and the antenna c to be tested form a second antenna measurement subsystem; the auxiliary antenna b and the antenna c to be tested form a third antenna measurement subsystem. In this embodiment, the antenna composition mode, the transmitting end, and the receiving end of the subsystem of the antenna measurement system are not limited, and can be determined by those skilled in the art according to actual needs.
Table 1 antenna measurement system
The phase function of each antenna measurement subsystem can be obtained by measuring the phase functions of a receiving end and a transmitting end by a Vector Network Analyzer (VNA), taking a transmission and a reception in a first antenna measurement subsystem as an example, and the phase function measurement equation is shown in a formula (1):
φ AB ＝φ ab +φ d +φ 0 (1)
Wherein,the phase functions of the receiving end and the transmitting end measured by the VNA are obtained; />Is the sum of the phase functions of the a and b antennas; />The phase function of the antenna measurement subsystem can be obtained by directly connecting the receiving end and the transmitting end of the first antenna measurement subsystem through an adapter for measurement (direct measurement); />As a phase function related to the measured distance:
φ d ＝-kd (2)
wherein d is the distance between the receiving antenna and the transmitting antenna, and k is the wave number:
similarly, the phase function of the second antenna measurement subsystem is: phi (phi) AC ＝φ ac +φ d +φ 0 The third antenna measuring subsystem has a phase function of phi BC ＝φ bc +φ d +φ 0 。
Step 202, calculating the group delay of each antenna measurement subsystem based on the phase function of each antenna measurement subsystem.
Illustratively, the antenna group delay is defined as:
wherein GD (Group Delay) is group delay in seconds, f is frequency in hertz,the phase is in degrees.
In practical engineering applications, for ease of calculation, the ratio of the phase difference to the frequency difference is often used to replace the derivative to approximate GD, as shown in equation (2):
as can be obtained from the formula (1) and the formula (5), the group delay of the first antenna measurement subsystem is:
GD AB ＝GD ab +GD 0 +GD d (6)
similarly, the group delay of the second antenna measurement subsystem is as follows: GD (graphics device) AC ＝GD ac +GD 0 +GD d The group delay of the third antenna measurement subsystem is as follows: GD (graphics device) BC ＝GD bc +GD 0 +GD d 。
Wherein,GD AB 、GD ab 、GD 0 GD (graphics device) d Respectively isAnd +.>Corresponding group delay, and:
GD ab ＝GD a +GD b (7)
wherein GD a And GD b The group delays of antennas a and b are respectively. The sum of group delays of antennas a and b in the first antenna measurement subsystem can be obtained according to the formula (6):
GD ab ＝GD AB -GD 0 -GD d (8)
similarly, the group delay of the second antenna measurement subsystem and the third antenna measurement subsystem is as follows:
GD ac ＝GD AC -GD 0 -GD d (9)
GD bc ＝GD BC -GD 0 -GD d (10)
step 203, generating a group delay measurement equation set of the whole antenna measurement system based on the group delay of each antenna measurement subsystem:
step 204, obtaining a first phase change value of a receiving end, a second phase change value of a transmitting end and a third phase change value of the antenna measurement subsystem in each antenna measurement subsystem.
Illustratively, the first phase change value of the receiving end is determined according to an equivalent network model as shown in FIG. 3, Γ in FIG. 3 RA The marked side represents the receiving antenna Γ RA Is the reflection coefficient of the receiving antenna; Γ -shaped structure RP The marked side represents the receiving-end cable,Γ RP for the reflection coefficient of the receiving end, the two are directly connected. The signal output by the receiving antenna is E, the signal received by the receiving antenna is b+a, and the following relational expression can be obtained by analyzing the network model of FIG. 3 by utilizing the microwave S parameter theory:
Thus:
the first phase change value is then obtained as:
the second phase change value of the transmitting end of the first antenna measurement subsystem is determined according to an equivalent network model as shown in fig. 4, and Γ in fig. 4 G The marked side represents the signal source Γ G Is the reflection coefficient of the signal source; Γ -shaped structure TA The marked side represents the transmitting antenna Γ TA Is the reflection coefficient of the transmitting antenna; Γ -shaped structure G And Γ TA The marked intermediate three-port network represents a directional coupler (with output cable), Γ D Representing the port reflection coefficient of the cable to which the coupling end of the directional coupler is connected.
The signal source is an active device, the true reflection coefficient of which is difficult to directly measure under the working condition, but if the directional coupler and the signal source are regarded as a whole (equivalent signal source), the signal source can be obtainedEquivalent source reflection coefficient Γ to directional coupler output port (cable port) TP Thereby simplifying the analysis process, and the equivalent network model at the moment is shown in figure 5, and Γ can be obtained by utilizing the microwave S parameter theory TP The expression is as follows, wherein the S parameter is the S parameter between ports of the directional coupler,
by analyzing the equivalent network model, the method can be obtained:
wherein E' is the output signal of the equivalent source, which is calculated by the output signal of the coupling port of the directional coupler, a 2 +b 2 Is the signal obtained on the transmitting antenna.
The second phase change value is therefore:
the first antenna measures the third phase change value of the subsystem itself, before measurement, a coaxial 'female-female' adapter is used to directly connect the transmitting end cable with the receiving end cable, the equivalent network model at the adapter is shown in fig. 6, fig. 6Γ TP The marked side represents the transmitting end cable, Γ RP The marked side represents the receiving end cable and the middle two-port network represents the adapter.
The signal fed in by the transmitting end (equivalent signal source) is E', and the signal received by the receiving end is b 2 +a 2 ，
The following relation can be obtained by analyzing the network model by utilizing the microwave S parameter theory:
the preparation method comprises the following steps of:
as a result of:
a 2 ＝b 2 Γ RP (25)
thus:
thus:
thus:
the third phase change value is therefore:
step 205, calculating to obtain a corresponding first group delay measurement error, second group delay measurement error and third group delay measurement error based on the first phase change value, second phase change value and third phase change value.
Illustratively, the first, second, and third phase change values resulting from step 204 described above are obtainable according to equations (5) and (16), equation (22), and equation (29):
First group delay measurement error for a first antenna measurement subsystem:
wherein ΔGD Rb 、ΔΦ Rb Respectively represent Δgd when the b-antenna is a receiving antenna R ΔΦ R 。
Second group delay measurement error of first antenna measurement subsystem:
wherein ΔGD Ta 、ΔΦ Ta Δgd when the a-antenna is a transmitting antenna T ΔΦ T 。
Third group delay measurement error of first antenna measurement subsystem:
similarly, the first group delay measurement error of the second antenna measurement subsystem can be obtained:second group delay measurement error: />Third group delay measurement error: />
Similarly, a first group delay measurement error of the third antenna measurement subsystem can be obtained:second group delay measurement error: />Third group delay measurement error: />
Step 206, obtaining a total mismatch correction factor based on the group delay measurement equation set of the whole antenna measurement system and the first group delay measurement error, the second group delay measurement error and the third group delay measurement error.
Illustratively, the measured phase function in step 201 is in turn equal to the difference between the measured receiver-side phase function and the measured transmitter-side phase function, as shown in equation (33):
Φ AB ＝Φ R -ΔΦ R -[Φ T -ΔΦ T ]＝φ ab +φ d +[φ 0 -Δφ Thru ] (33)
wherein phi is R -ΔΦ R For the first phase function of the receiving end after the system mismatch correction, phi T -ΔΦ T For the second phase function of the transmitting end after the system mismatch correction 0 -Δφ Thru And measuring the phase function of the subsystem per se for the first antenna after mismatch correction, and finishing to obtain:
Φ R -Φ T -ΔΦ R +ΔΦ T ＝φ ab +φ d +φ 0 -Δφ Thru (34)
substituting the formula (34) into the formula (5) can obtain a corresponding group delay measurement equation as follows:
GD AB -ΔGD Rb +ΔGD Ta ＝GD ab +GD d +GD 0 -ΔGD Thru (35)
the above equation is a group delay measurement equation of the first antenna measurement subsystem after mismatch correction is considered, and the equation is obtained by performing the term shifting transformation:
wherein:
GD ab ′＝GD AB -GD d -GD 0 (37)
according to equation (8), it represents the sum of group delays of antennas a, b when mismatch correction is not considered.
C 1 ＝-ΔGD Rb +ΔGD Ta +ΔGD Thru (38)
The same principle can be obtained:
GD ac ＝GD ac ′+C 2
GD bc ＝GD bc ′+C 3 (39)
wherein:
GD is put into ab 、GD ac GD (graphics device) bc The group delay measurement result GD of the antenna c to be measured after the mismatch correction is considered can be obtained after the group delay measurement result GD is carried into the formula (11) c ：
Wherein:
GD c ' is obtained without considering mismatch correctionAnd (5) the group delay of the antenna to be detected is achieved.
C is the total mismatch correction factor.
And step 207, performing impedance mismatch correction on the group delay of the antenna to be tested based on the total mismatch correction factor. Illustratively, the measured group delay is numerically corrected according to the calculated total mismatch correction factor.
The invention provides an impedance mismatch correction method for antenna group delay measurement, which is applied to an antenna measurement system and comprises the following steps: respectively acquiring a phase function of each antenna measurement subsystem in the antenna measurement system; respectively calculating the group delay of each antenna measurement subsystem based on the phase function; generating a group delay measurement equation set of the whole antenna measurement system based on the group delay; acquiring a first phase change value of a receiving end, a second phase change value of a transmitting end and a third phase change value of the antenna measurement subsystem in each antenna measurement subsystem; calculating corresponding first group delay measurement errors, second group delay measurement errors and third group delay measurement errors based on the first phase change value, the second phase change value and the third phase change value; based on a group delay measurement equation set and a first group delay measurement error, a second group delay measurement error and a third group delay measurement error of the whole antenna measurement system, obtaining a total mismatch correction factor; and carrying out impedance mismatch correction on the group delay of the antenna to be detected based on the total mismatch correction factor. In the embodiment of the invention, the antenna group delay measurement system is established, the measurement error of the antenna group delay is obtained through measurement and calculation, and the impedance mismatch correction is carried out on the antenna to be measured according to the measurement error, so that the correct group delay measurement value is obtained, and the performance of the antenna is accurately described.
As an optional embodiment of the present invention, the process of the first phase change value in step 204 includes: based on an equivalent network model of a receiving end of each antenna measurement subsystem, respectively acquiring a first signal output by a receiving antenna of each antenna measurement subsystem and a second signal received by the receiving end; and calculating the first phase change value based on the first signal and the second signal of each antenna measurement subsystem respectively. For example, the details of the first phase change value at the receiving end in the above step 204 are described in detail, which is not repeated here.
As an alternative embodiment of the present invention, the first phase change value is calculated by the following formula:
wherein a+b is a second signal received by the receiving end, E is a first signal output by the receiving antenna, Γ RA For receiving the antenna reflection coefficient Γ RP Is the reflection coefficient of the receiving end;
calculating the first group delay measurement error by the following formula:
/>
where Δf is the frequency difference. For example, the details of the foregoing content of the first phase change value of the receiving end in step 204 and the relevant content of the first group delay measurement error in step 205 are not described herein.
As an optional embodiment of the present invention, a directional coupler is disposed between a signal source and a transmitting antenna of the antenna measurement system, and the process of the second phase change value in step 204 includes: based on an equivalent network model of the transmitting end of each antenna measurement subsystem, respectively acquiring a first signal and a second received signal which are output by the transmitting end of each antenna measurement subsystem; wherein the first signal is an output signal of the directional coupler; and calculating the second phase change value based on the first signal and the second signal of each antenna measurement subsystem respectively. For example, the details of the second phase change value of the transmitting end in the above step 204 are described in detail, which is not repeated here.
As an alternative embodiment of the present invention, the second phase change value is calculated by the following formula:
wherein a is 2 +b 2 For receiving the second signal, E' is the first signal output by the transmitting end (equivalent signal source), Γ TP As the reflection coefficient of the transmitting end (equivalent signal source) in the equivalent network model, Γ TA For the reflection coefficient of the transmitting antenna, b 3 For the directional coupler 3 port to output signals S 21 、S 22 、S 23 、S 31 And S is 33 S parameters among ports of the directional coupler;
calculating the first group delay measurement error by the following formula:
where Δf is the frequency difference. For example, the details of the foregoing content of the second phase change value of the receiving end in step 204 and the relevant content of the second group delay measurement error in step 205 are not described herein.
As an optional embodiment of the present invention, the process of the third phase change value in step 204 includes: based on the straight-through measurement equivalent network model of each antenna measurement subsystem, respectively acquiring a first signal output by a transmitting end of each antenna measurement subsystem and a second signal received by a receiving end; and calculating the third phase change value based on the first signal and the second signal of each antenna measurement subsystem respectively. For example, the details of the third phase change value of the transmitting end in the above step 204 are described in detail, which is not repeated here.
As an alternative embodiment of the present invention, the third phase change value is calculated by the following formula:
wherein a is 2 +b 2 For the second signal received by the receiving end, E' is the first signal output by the transmitting end (equivalent signal source), Γ TP For the reflection coefficient of the transmitting end (equivalent signal source) in the equivalent network model, S 12 For the reverse transmission coefficient S 21 Is a forward transmission coefficient, S 11 To input the reflection coefficient S 22 To output the reflection coefficient Γ RP Is the reflection coefficient of the receiving end;
calculating the first group delay measurement error by the following formula:
where Δf is the frequency difference. For example, the details of the foregoing content of the third phase change value of the receiving end in step 204 and the relevant content of the third group delay measurement error in step 205 are not described herein.
As an optional embodiment of the present invention, the step 206 includes: respectively acquiring a first phase function of a receiving end after mismatch correction and a second phase function of a transmitting end after mismatch correction of each antenna measurement subsystem; based on the first phase function, the second phase function and the third phase function after mismatch correction, a phase function equation after mismatch correction of each antenna measurement subsystem is obtained; obtaining a group delay measurement equation after the mismatch correction of each subsystem based on the phase function equation; based on the group delay measurement equation after the mismatch correction of each measurement subsystem, the total mismatch correction factor is obtained by simultaneous equation set. Illustratively, details of step 206 are related to the above, and will not be described herein.
As an optional embodiment of the present invention, the antenna operating frequency band of each antenna measurement subsystem in the antenna measurement system is the same. As can be seen from equation (5), when each antenna measurement subsystem keeps the same operating frequency band, only the value of the corresponding phase change is needed to be considered when calculating the phase change, and the frequency difference is not needed to be considered, so that the method for solving the mismatch factor is simplified.
The embodiment of the invention also discloses an antenna group delay impedance mismatch correction device, as shown in fig. 7, which comprises:
the first obtaining module 701 is configured to obtain a phase function of each antenna measurement subsystem in the antenna measurement system, where the phase function is a sum of phase functions of antennas included in the corresponding antenna measurement subsystem, a phase function of the antenna measurement subsystem, and a distance phase function calculated. Illustratively, the details of step 201 are described above, and will not be repeated here.
The first calculating module 702 is configured to calculate a group delay of each antenna measurement subsystem based on the phase function of each antenna measurement subsystem. Illustratively, the details of step 202 are described above, and will not be repeated here.
The measurement equation generating module 703 is configured to generate a group delay measurement equation set of the entire antenna measurement system according to the group delay of each antenna measurement subsystem. For example, the details of step 203 are described above, and will not be described here again.
A second obtaining module 704, configured to obtain a first phase change value of a receiving end, a second phase change value of a transmitting end, and a third phase change value of the antenna measurement subsystem in the antenna measurement subsystem; illustratively, the details of step 204 are described above, and will not be repeated here.
The second calculating module 705 is configured to calculate a corresponding first group delay measurement error, a second group delay measurement error, and a third group delay measurement error based on the first phase change value, the second phase change value, and the third phase change value. Illustratively, the details of step 205 are described above, and will not be repeated here.
A third calculation module 706, configured to obtain a total mismatch correction factor based on the group delay measurement equation set of the entire antenna measurement system and the first group delay measurement error, the second group delay measurement error, and the third group delay measurement error. Illustratively, the details of step 206 are described above, and will not be repeated here.
And the correction module 707 is configured to perform impedance mismatch correction on the group delay of the antenna to be tested based on the total mismatch correction factor. Illustratively, the details of step 207 are described above, and will not be repeated here.
The invention provides an impedance mismatch correction device for antenna group delay measurement, which is applied to an antenna measurement system and comprises: the first acquisition module is used for respectively acquiring the phase function of each antenna measurement subsystem in the antenna measurement system; the first calculation module is used for calculating the group delay of each antenna measurement subsystem based on the phase function; the system comprises a measurement equation set generation module, a group delay measurement equation set generation module and a group delay measurement module, wherein the measurement equation set generation module is used for generating a group delay measurement equation set of the whole antenna measurement system based on group delay; the second acquisition module is used for acquiring a first phase change value of a receiving end, a second phase change value of a transmitting end and a third phase change value of the antenna measurement subsystem in each antenna measurement subsystem; the second calculation module is used for calculating corresponding first group delay measurement errors, second group delay measurement errors and third group delay measurement errors based on the first phase change value, the second phase change value and the third phase change value; the third calculation module is used for obtaining a total mismatch correction factor based on a group delay measurement equation set and a first group delay measurement error, a second group delay measurement error and a third group delay measurement error of the whole antenna measurement system; and the correction module is used for carrying out impedance mismatch correction on the group delay of the antenna to be detected based on the total mismatch correction factor. In the embodiment of the invention, the antenna group delay measurement system is established, the measurement error of the antenna group delay is obtained through measurement and calculation, and the impedance mismatch correction is carried out on the antenna to be measured according to the measurement error, so that the correct group delay measurement value is obtained, and the performance of the antenna is accurately described.
The present invention also provides an electronic device, as shown in fig. 8, which may include a processor 801 and a memory 802, where the processor 801 and the memory 802 may be connected by a bus or other means, and in fig. 8, the connection is exemplified by a bus.
The processor 801 may be a central processing unit (Central Processing Unit, CPU). The processor 801 may also be a chip such as other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination thereof.
The memory 802 is used as a non-transitory computer readable storage medium for storing a non-transitory software program, a non-transitory computer executable program, and a module, such as a program instruction/module corresponding to an impedance mismatch correction method for antenna group delay measurement in an embodiment of the present invention. The processor 801 executes various functional applications of the processor and data processing by running non-transitory software programs, instructions, and modules stored in the memory 802, i.e., implements an impedance mismatch correction method for antenna group delay measurement in the above-described method embodiments.
Memory 802 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created by the processor 801, or the like. In addition, memory 802 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 802 may optionally include memory located remotely from processor 801, which may be connected to processor 801 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 802, which when executed by the processor 801, performs an impedance mismatch correction method for antenna group delay measurement in the embodiments shown in fig. 1-6.
The details of the electronic device may be understood in correspondence with the corresponding related descriptions and effects in the embodiments shown in fig. 1 to 6, which are not described herein.
It will be appreciated by those skilled in the art that implementing all or part of the above-described embodiment method may be implemented by a computer program to instruct related hardware, where the program may be stored in a computer readable storage medium, and the program may include the above-described embodiment method when executed. Wherein the storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations are within the scope of the invention as defined by the appended claims.
Claims (5)
1. An impedance mismatch correction method for antenna group delay measurement is characterized by being applied to an antenna measurement system, wherein the antenna measurement system comprises: a first antenna measurement subsystem, a second antenna measurement subsystem, and a third antenna measurement subsystem, the method comprising:
respectively obtaining a phase function of each antenna measurement subsystem in the antenna measurement system, wherein the phase function is calculated by the sum of phase functions of antennas contained in the corresponding antenna measurement subsystem, the phase function of the antenna measurement subsystem and the distance phase function;
respectively calculating the group delay of each antenna measurement subsystem based on the phase function of each antenna measurement subsystem;
generating a group delay measurement equation set of the antenna measurement system based on the group delay of each antenna measurement subsystem;
acquiring a first phase change value of a receiving end, a second phase change value of a transmitting end and a third phase change value of an antenna measurement subsystem in each antenna measurement subsystem;
Calculating to obtain corresponding first group delay measurement errors, second group delay measurement errors and third group delay measurement errors based on the first phase change value, the second phase change value and the third phase change value;
based on the group delay measurement equation set of the antenna measurement system and the first group delay measurement error, the second group delay measurement error and the third group delay measurement error, obtaining a total mismatch correction factor;
performing impedance mismatch correction on the group delay of the antenna to be detected based on the total mismatch correction factor;
the process of obtaining the first phase change value of the receiving end in each antenna measurement subsystem includes:
based on an equivalent network model of a receiving end of each antenna measurement subsystem, respectively acquiring a first signal output by a receiving antenna of each antenna measurement subsystem and a second signal received by the receiving end;
calculating the first phase change value based on the first signal and the second signal of each antenna measurement subsystem respectively; wherein the first phase change value is calculated by the following formula:
，
wherein a+b is a second signal received by the receiving end, E isReceiving a first signal Γ output by an antenna RA For receiving the antenna reflection coefficient Γ RP Is the reflection coefficient of the receiving end;
calculating the first group delay measurement error by the following formula:
，
wherein,is the frequency difference;
wherein a directional coupler is arranged between a signal source and a transmitting antenna of the antenna measuring system,
the process for obtaining the second phase change value of the transmitting end in each antenna measurement subsystem comprises the following steps:
based on an equivalent network model of the transmitting end of each antenna measurement subsystem, respectively acquiring a first signal and a second received signal which are output by the transmitting end of each antenna measurement subsystem; wherein the first signal is an output signal of the directional coupler;
calculating the second phase change value based on the first signal and the second signal of each antenna measurement subsystem respectively; wherein the second phase change value is calculated by the following formula:
，
，
，
wherein a is 2 +b 2 For receiving the second signal, E' is the first signal output by the transmitting end, Γ TP For the equivalent networkReflection coefficient of transmitting end in complex model TA For the reflection coefficient of the transmitting antenna Γ D Port reflectance of cable connected to coupling end of directional coupler, b 3 For the directional coupler 3 port to output signals S 21 、S 22 、S 23 、S 31 And S is 33 S parameters among ports of the directional coupler;
calculating the second group delay measurement error by the following formula:
，
wherein,is the frequency difference;
the process of obtaining the third phase change value of the antenna measurement subsystem comprises the following steps:
based on the straight-through measurement equivalent network model of each antenna measurement subsystem, respectively acquiring a first signal output by a transmitting end of each antenna measurement subsystem and a second signal received by a receiving end;
calculating the third phase change value based on the first signal and the second signal of each antenna measurement subsystem respectively; wherein the third phase change value is calculated by the following formula:
，
wherein a is 2 +b 2 For the second signal received by the receiving end, E' is the first signal output by the transmitting end, Γ TP S is the reflection coefficient of the transmitting end in the equivalent network model 12 For the reverse transmission coefficient S 21 Is a forward transmission coefficient, S 11 To input the reflection coefficient S 22 To output the reflection coefficient Γ RP Is the reflection coefficient of the receiving end;
calculating the third group delay measurement error by the following formula:
，
wherein,is the frequency difference;
the method for obtaining the total mismatch correction factor based on the group delay measurement equation set of the antenna measurement system and the first group delay measurement error, the second group delay measurement error and the third group delay measurement error includes:
Respectively acquiring a first phase function of a receiving end after mismatch correction, a second phase function of a transmitting end after mismatch correction and a third phase function of the receiving end after mismatch correction of each antenna measurement subsystem;
based on the first phase function of the receiving end, the second phase function of the transmitting end and the third phase function of the transmitting end after mismatch correction, a phase function equation after mismatch correction of each antenna measurement subsystem is obtained;
obtaining a group delay measurement equation after the mismatch correction of each subsystem based on the phase function equation;
based on the group delay measurement equation after the mismatch correction of each measurement subsystem, the total mismatch correction factor is obtained by simultaneous equation set.
2. The method of claim 1, wherein the antenna operating frequency band of each of the antenna measurement subsystems is the same.
3. An impedance mismatch correction device for antenna group delay measurement, which is applied to an antenna measurement system, comprising:
the first acquisition module is used for respectively acquiring the phase function of each antenna measurement subsystem in the antenna measurement system, wherein the phase function is calculated by the sum of the phase functions of the antennas contained in the corresponding antenna measurement subsystem, the phase function of the antenna measurement subsystem and the distance phase function;
The first calculation module is used for calculating the group delay of each antenna measurement subsystem based on the phase function of each antenna measurement subsystem;
the system comprises a measurement equation set generating module, a group delay measuring equation set generating module and a group delay measuring module, wherein the measurement equation set generating module is used for generating a group delay measuring equation set of each antenna measuring subsystem;
the second acquisition module is used for acquiring a first phase change value of a receiving end, a second phase change value of a transmitting end and a third phase change value of the antenna measurement subsystem in each antenna measurement subsystem;
the second calculation module is used for calculating corresponding first group delay measurement errors, second group delay measurement errors and third group delay measurement errors based on the first phase change value, the second phase change value and the third phase change value;
the third calculation module is used for obtaining a total mismatch correction factor based on the group delay measurement equation set of the antenna measurement system, the first group delay measurement error, the second group delay measurement error and the third group delay measurement error;
the correction module is used for carrying out impedance mismatch correction on the group delay of the antenna to be detected based on the total mismatch correction factor;
the process of obtaining the first phase change value of the receiving end in each antenna measurement subsystem by the second obtaining module includes:
Based on an equivalent network model of a receiving end of each antenna measurement subsystem, respectively acquiring a first signal output by a receiving antenna of each antenna measurement subsystem and a second signal received by the receiving end;
calculating the first phase change value based on the first signal and the second signal of each antenna measurement subsystem respectively; wherein the first phase change value is calculated by the following formula:
，
wherein a+b is a second signal received by the receiving end, E is a first signal output by the receiving antenna, Γ RA For receiving the antenna reflection coefficient Γ RP Is the reflection coefficient of the receiving end;
calculating the first group delay measurement error by the following formula:
，
wherein,is the frequency difference;
wherein a directional coupler is arranged between a signal source and a transmitting antenna of the antenna measuring system,
the second obtaining module obtains a second phase change value of the transmitting end in each antenna measurement subsystem, including:
based on an equivalent network model of the transmitting end of each antenna measurement subsystem, respectively acquiring a first signal and a second received signal which are output by the transmitting end of each antenna measurement subsystem; wherein the first signal is an output signal of the directional coupler;
Calculating the second phase change value based on the first signal and the second signal of each antenna measurement subsystem respectively; wherein the second phase change value is calculated by the following formula:
，
，
，
wherein a is 2 +b 2 For receiving the second signal, E' is the first signal output by the transmitting end, Γ TP For the reflection coefficient of the transmitting end in the equivalent network model, Γ TA For the reflection coefficient of the transmitting antenna Γ D Port reflectance of cable connected to coupling end of directional coupler, b 3 For the directional coupler 3 port to output signals S 21 、S 22 、S 23 、S 31 And S is 33 S parameters among ports of the directional coupler;
calculating the second group delay measurement error by the following formula:
，
wherein,is the frequency difference;
the process of acquiring the third phase change value of the antenna measurement subsystem by the second acquisition module includes:
based on the straight-through measurement equivalent network model of each antenna measurement subsystem, respectively acquiring a first signal output by a transmitting end of each antenna measurement subsystem and a second signal received by a receiving end;
calculating the third phase change value based on the first signal and the second signal of each antenna measurement subsystem respectively; wherein the third phase change value is calculated by the following formula:
，
Wherein a is 2 +b 2 For the second signal received by the receiving end, E' is the first signal output by the transmitting end, Γ TP S is the reflection coefficient of the transmitting end in the equivalent network model 12 For the reverse transmission coefficient S 21 Is a forward transmission coefficient, S 11 To input the reflection coefficient S 22 To output the reflection coefficient Γ RP Is the reflection coefficient of the receiving end;
calculating the third group delay measurement error by the following formula:
，
wherein,is the frequency difference;
the third calculation module obtains a total mismatch correction factor based on the group delay measurement equation set of the antenna measurement system and the first group delay measurement error, the second group delay measurement error and the third group delay measurement error, and the total mismatch correction factor includes:
respectively acquiring a first phase function of a receiving end after mismatch correction, a second phase function of a transmitting end after mismatch correction and a third phase function of the receiving end after mismatch correction of each antenna measurement subsystem;
based on the first phase function of the receiving end, the second phase function of the transmitting end and the third phase function of the transmitting end after mismatch correction, a phase function equation after mismatch correction of each antenna measurement subsystem is obtained;
obtaining a group delay measurement equation after the mismatch correction of each subsystem based on the phase function equation;
Based on the group delay measurement equation after the mismatch correction of each measurement subsystem, the total mismatch correction factor is obtained by simultaneous equation set.
4. An electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the steps of an impedance mismatch correction method for antenna group delay measurement as claimed in claim 1 or 2.
5. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the steps of an impedance mismatch correction method for antenna group delay measurement according to claim 1 or 2.
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