CN117054980A - Receiving channel calibration method for integrated digital array radar - Google Patents
Receiving channel calibration method for integrated digital array radar Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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Abstract
The invention relates to a receiving channel calibration method for an integrated digital array radar, which comprises the following steps: s101, determining and correcting a phase error; s102, preparing a radar calibration test; s103, outputting the maximum value of the amplitude in all the one-dimensional complex data; s104, determining a calibration coefficient and storing the calibration coefficient in an upper computer; s105, fixed amplitude phase difference calculation of a receiving channel comprises the following steps: the determined calibration coefficients are received through closed loop and open loop, and the ratio is performed to determine a fixed error; the upper computer transmits the fixed error to the radar for storage; s106, the fixed error C i Loading the calibration coefficients into a system processing module of the radar, and powering up the radar after powering down the radar to obtain the calibration coefficients; s107, loading calibration coefficient test on the open loop receiving channel to determine final calibration performance parameters. The harsh performance requirements of the amplitude phase consistency of the calibration coupling paths and the link channels of all levels are lowered, and the overall complexity of calibration is reduced.
Description
Technical Field
The invention belongs to the technical field of a radar, and particularly relates to a receiving channel calibration method for an integrated digital array radar.
Background
Each array element or subarray of the digital array radar is connected with a transmitting/receiving channel, and the formation of radar beams and the scanning of the radar beams are realized in a digital domain through a digital beam forming technology. Because of the certain difference of the devices in each channel, the amplitude-phase characteristics of the channels in different frequencies and numerical control attenuation states are inconsistent. If the calibration is not carried out, the quality of the directional diagram after the digital beam forming is affected, and particularly the beam width and the sidelobe level are greatly affected, so that the radar detection performance is affected. In order to reduce the influence of channel inconsistency on the digital array radar, measures are required to eliminate all errors from the antenna array surface to the digital channels, so that the amplitude-phase characteristics of all subarrays of the radar tend to be consistent.
At present, the method in the prior art adopts a conventional digital array radar, the conventional digital array radar multi-channel calibration does not comprise an antenna array surface, the input of calibration signals adopts uniform calibration signals, the coupling lines ensured by extremely high channel consistency design are fed into all channels for receiving, the amplitude phase difference of the digital signals received by all channels is calculated, the error is compensated in a digital domain, the calibration among channels is realized, the channel calibration does not comprise all subarray channels of the antenna array surface, and all subarray channels of the antenna array surface determine a certain error range of the amplitude phase of the partial signals in a design assurance mode through independent test.
Therefore, the calibration method commonly used at present needs to be designed to ensure that the signal amplitude input by the coupling port is consistent, and the signal amplitude calibrated by the antenna array face sub-array radio frequency/digital channel is consistent, so that the directional diagram index performance of the radar digital beam forming needs two sections of test error assurance, certain uncertainty exists, and the radar is required to finish directional diagram calibration through an external field target. And the front end antenna array surface and the rear end radio frequency and digital processing of the integrated digital array radar are physically indistinct, namely the antenna array surface cannot be independently tested after the scale is large, so that the calibration efficiency of the radar is reduced.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide a receiving channel calibration method for an integrated digital array radar, which solves the technical problem that the radar calibration efficiency is reduced in the existing method. The technical scheme of the scheme has a plurality of technical advantages, and the following description is provided:
the receiving channel calibration method of the integrated digital array radar comprises the following steps:
s101, when a test field does not meet far-field test conditions, determining a phase error and correcting the phase error;
s102, radar calibration test preparation, comprising: assembling the radar of the integrated digital array to be tested on a turntable bracket, connecting a calibration signal output end of the radar to a radiation feed element for testing through a radio frequency cable, and completing connection of the radar and an upper computer;
s103, generating a calibration signal waveform of the radar, receiving echo signals fed back by the radiation feed element, processing the echo signals, and outputting the maximum value of the amplitude in all the one-dimensional complex data;
s104, performing open loop receiving channel fixed amplitude phase difference test on the maximum value to determine a calibration coefficient C i_open And storing in an upper computer, and determining calibration coefficients by a closed loop receiving channel fixed amplitude phase difference testAnd storing in an upper computer;
s105, fixed amplitude phase difference calculation of a receiving channel comprises the following steps: the calibration coefficients determined by closed loop and open loop reception and ratio is performed to determine the fixed error C i The method comprises the steps of carrying out a first treatment on the surface of the The upper computer fixes the error C i Transmitting the data to a radar for storage;
s106, the fixed error C i Loading the calibration coefficient C into a system processing module of the radar, and powering up the radar after powering down the radar to obtain a calibration coefficient C i_close2 ；
S107, testing the open loop receiving channel loading calibration coefficient to determine the final calibration performance parameter C i_correct 。
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the characteristics of plane wave reception are provided by using far field conditions, the fixed errors of calibration branches among different channels are calculated and obtained through radar self-processing resources through open loop receiving channel error test and closed loop receiving channel error test, the errors are compensated after the errors are stored in the radar, the problem of unbalance of the calibration coupling branches can be solved in a laboratory, and the purpose of signal all-link multichannel equalization is achieved.
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In order to more clearly illustrate the embodiments of the 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 described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a test field calibration link relationship;
FIG. 2 is a schematic diagram of open loop calibration of a receive channel;
fig. 3 is a schematic diagram of closed loop calibration of a receive channel.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. 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 prior art, two sections of an antenna and a radio frequency channel are subjected to error testing, the two sections are subjected to error testing as design assurance, and the amplitude phase consistency of the channel interconnection mode of the two sections cannot be determined, so that certain uncertainty exists, and the service performance of the radar is reduced. However, the invention obtains the fixed errors between the receiving channels by designing the open-loop and closed-loop receiving methods, and further realizes the integral digital array radar all-link channel calibration from the subarray channel to the subarray radio frequency/digital frequency conversion channel through the antenna array surface by correcting the fixed errors, thereby providing support for the efficient internal field test of the radar digital synthesis pattern. The method can reduce the extremely high design requirement of the calibration coupling circuit and reduce the overall complexity of calibration. The invention relates to a receiving channel calibration method for an integrated digital array radar, which is characterized by comprising the following steps:
s101, when the test field does not meet the far-field test condition, determining the phase error, and correcting the phase error, wherein the purpose is to correct the error of the test field measurement system, and the specific is that:
when the test field does not meet the far-field test condition, correcting the phase error between the test radar array surface and the test field radiation feed element, and correcting the phase error as a measurement system error. And installing the integrated digital array radar to be tested on a turntable bracket, and rotating the turntable to a mechanical zero position. The output end of the vector network is connected with the radiation feed element of the test field, and the input end of the vector network is sequentially connected with each array face sub-array radio frequency port Ant i (i=1..n) (where N is the number of subarrays of the radar array surface), as shown in fig. 1, the radar is mounted on the turntable, the turntable is abutted to the control device, the output end of the radar is connected with the radiation feed element for testing through the amplifier, and the test is completed by receiving echo signals of the radiation feed element through the radar. Record readings C for each vector network Ant_i (i=1..16), plane wave error is calculatedPlane wave errors are corrected by CAM software.
S102, radar calibration test preparation, comprising: assembling the radar of the integrated digital array to be tested on a turntable bracket, enabling a calibration signal output end of the radar to be connected with a radiation feed element for testing through a radio frequency cable, and completing connection of the radar and an upper computer, wherein the turntable bracket drives the radar to rotate in the testing process, so that testing of the radar is completed;
s103, generating a calibration signal waveform of the radar, receiving an echo signal fed back by the radiation feed element, processing the echo signal, outputting the maximum value of the amplitude in all the one-dimensional complex data, deriving data by a recorder of the radar, and connecting the recorder with debugging software of an upper computer, wherein the specific steps are as follows:
processing the echo signals, comprising: the radar generates N Pulse A calibration signal of individual pulses, each pulse signal being a modulated continuous wave signal with zero primary phase, the baseband frequency of the continuous wave signal being set to a preset proportion of the sampling rate, the preset proportion, for example, the baseband frequency of the continuous wave signal being 1/4 or 3/4 or other proportion of the sampling rate;
after each subarray of the radar receives a signal for digital preprocessing (preprocessing refers to baseband signals or I/Q signals obtained through digital down-conversion processing), fourier transformation FFT is carried out along a distance dimension, and then one-dimensional complex data is obtained through summation along a pulse dimension;
outputting the maximum value of the amplitude in all the one-dimensional complex Data, wherein the maximum value is recorded as Data i (i＝1..N)。
S104, performing open loop receiving channel fixed amplitude phase difference test on the maximum value to determine a calibration coefficient C i_open And storing in an upper computer, and determining calibration coefficients by a closed loop receiving channel fixed amplitude phase difference testAnd stored in the upper computer, specifically:
the open loop receiving channel fixed amplitude phase difference test comprises:
1. during testing, the radar controls the directional azimuth angle and the pitch angle of the directional diagram to be 0 degree under the radar system;
2. traversing frequency points (radar frequency points), and setting AGC (automatic gain control) of each subarray radio frequency conversion channel module of the radar to be 0dB; recording the processing result of each channel module under each frequency point (the processing mode adopts the method for processing echo signals in S103), and recording the processing result as Data i_open (i=1..n), and processing result Data i_open (i=1..N) is forwarded to the upper computer debugging software, and the debugging software generates calibration coefficients under each frequency pointAnd store in the host computer, C i_open As a result of the first calculation, also denoted as C i-open1 ；
A closed loop receive channel fixed amplitude phase difference test comprising:
1. during testing, the radar controls the directional azimuth angle and the pitch angle of the directional diagram to be 0 degree under the radar system;
2. traversing frequency points, setting digital gain control AGC of each subarray radio frequency channel module to be 0dB, (the processing mode adopts the method for processing echo signals in S103), and recording the processing result of each channel as Data i_close (i=1..n) and forwarded to the upper computer debugging software, which generates calibration coefficients at each frequency pointAnd store in the host computer, C i_close The result of the first calculation may also be denoted as Ci-close1.
S105, fixed amplitude phase difference calculation of a receiving channel comprises the following steps: the calibration coefficients determined by closed loop and open loop reception and ratio is performed to determine the fixed error C i The method comprises the steps of carrying out a first treatment on the surface of the The upper computer fixes the error C i Transmitting to radar for storage, such as:
the calibration coefficients determined by closed loop and open loop reception are ratio-determined to determine a fixed error C i ；
Fixed error C i According to the formulaCalculating the fixing error C of each frequency point i The upper computer fixes the error C i And transmitting the data to a radar for storage.
S106, the fixed error C i Loading the calibration coefficient C into a system processing module of the radar, and powering up the radar after powering down the radar to obtain a calibration coefficient C i_close2 In particular, the method comprises the steps of,
1. the radar is powered down and then powered up;
2. performing closed loop error test again according to the connection line in FIG. 3, traversing the frequency points and AGC of the radar according to the fixed amplitude phase difference test method of the closed loop receiving channel in S104, and recording each frequency point of each channel,Processing result record Data under AGC i_close2 (i=1..n), then the radar calculates calibration coefficients at different frequency points, AGCAnd stored in the radar.
S107, testing the open loop receiving channel loading calibration coefficient to determine the final calibration performance parameter C i_correct Specific:
the loading of the open loop receiving channel is performed again in the manner of fig. 2 (the module setting manner of the radar of fig. 2 is the existing manner and is not described here again), which includes:
adjusting the wave control pointing direction to pitch by 0 degrees;
traversing the frequency point and the digital gain control AGC of the radar, and processing the echo signal to obtain a processing result Data i_open2 (i=1..n.) and performing a calibration, the method of calibration:
finding out corresponding calibration coefficient C according to frequency point and AGC of radar i ×C i_close2 And Data i_open2 (i=1..n) performing the calibration processing to obtain a calibrated processing result Data i_correct The expression is:
Data i_correct ＝Data i_open2 ×C i ×C i_close2 ；
the calibrated processing result Data i_correct Transmitting to the upper computer for analysis, calculating to obtain final calibration performance parameters by means of ratio
Depending on the application, the final calibration performance parameter may also be modified, e.g. determinedThe corresponding channels calibrate the amplitude and phase difference of performance indexes under different frequency points and AGC, judge whether the difference is in a preset range, if so, the open loop receiving channel loads the calibration coefficient effectively, if not, the open loop receiving channel loads the calibrationThe coefficient is invalid and the calibrated processing result Data is used for i_correct Reassigning, data i_correct ＝Data i_open2 ×C i ×C i_close2 Repeating the steps of S101-S106 in sequence until the satisfaction of the preset range.
Examples
The present invention will be described in further detail with reference to specific examples.
Without losing generality, the channel calibration is carried out on a certain type of integrated 16-channel digital array radar, and the specific implementation steps are as follows:
step one: test field error coefficient calibration
When the test field does not meet the far-field test condition, correcting the phase error between the test radar array surface and the test field radiation feed element, and correcting the phase error as a measurement system error. And installing the integrated digital array radar to be tested on a turntable bracket, and rotating the turntable to a mechanical zero position. The output end of the vector network is connected with the radiation feed element of the test field, and the input end of the vector network is sequentially connected with each array face sub-array radio frequency port Ant i (i=1..n) (where N is the number of radar array area subarrays) as shown in fig. 1. Record readings C for each vector network Ant_i (i=1..16), plane wave error is calculated
Step two: radar calibration test preparation
The integrated digital array radar to be tested is completely assembled, a radar calibration signal output end is connected with a radiation feed element for test through a radio frequency cable, and the integrated digital array radar is connected with an upper computer, as shown in figure 1.
Step three: radar calibration signal waveform generation and received signal processing
Integrated digital array radar generation N Pulse A calibration signal of pulses, each pulse being a pulse modulated point frequency continuous wave with an initial phase of 0, PRI 100us, pulse width 20us, transmit pulse delay 20us, and baseband frequency of 1M.
The radar processing subsystem receives I, Q paths of numbers with sampling frequency of 4M for each subarray channelThe number of sampling points of each pulse is 320, 64 points are intercepted from the 84 th sampling point, FFT is carried out along the distance dimension, and then 64 point complex data are obtained by summation along the pulse dimension. The maximum value output after the 1,2,63,64 th point is removed is recorded as Data i (i＝1..16)。
Step four: open loop receiving channel fixed amplitude phase difference test
1. According to the connection line of FIG. 2, the wave control is directed to azimuth 0 degrees and pitching 0 degrees;
2. traversing frequency points from 8 GHz to 12GHz at intervals of 0.01GHz, fixing AGC of each subarray radio frequency module to 0dB, recording processing results of 16 channels as Data according to the operation of the step two i_open (i=1..16) and is forwarded to the upper computer debugging software, and the upper computer debugging software generates coefficients of all frequency pointsAnd stored in the host computer.
Step five: closed loop receiving channel fixed amplitude phase difference test
1. The connection is shown in FIG. 3;
2. traversing frequency points from 8 GHz to 12GHz at intervals of 0.01GHz, fixing AGC of each subarray radio frequency module to 0dB, recording processing results of each channel as Data according to the operation of the step two i_close (i=1..16) and is forwarded to the upper computer debugging software, and the upper computer debugging software generates coefficients of all frequency pointsAnd stored in the host computer.
Step six: reception channel fixed error calculation
The upper computer is according to the formulaCalculating the fixing error C of each frequency point i The upper computer fixes the error C i And transmitting the data to a radar for storage.
Step seven: one of the calibration coefficient loading tests: closed loop receive channel amplitude phase difference test
1. The radar is powered on more than 10 minutes after being powered off;
2. according to FIG. 3Performing closed loop error test for the second time, traversing frequency points from 8-12GHz at 0.01GHz interval, traversing AGC from 0-56dB at 2dB interval, controlling all subarrays to be the same AGC, recording each frequency point of each channel and recording Data of processing results under the AGC according to the operation of the step two i_close2 (i=1..16), the radar generates coefficients under AGC at different frequency pointsAnd stored in a radar processing subsystem memory;
step eight: second, calibration coefficient loading test: open loop receive channel loading calibration coefficient test
1. Open loop calibration coefficient loading test is carried out according to the connection line of fig. 2, and the wave control pointing direction pitching is 0 degrees;
2. traversing frequency points at intervals of 0.01GHz and 0-56dB at intervals of 2dB, traversing AGC (automatic gain control), controlling all subarrays to be the same AGC, and processing a result Data of the radar on each channel according to the operation of the step two i_open2 (i=1..16) performing calibration processing, and finding a corresponding calibration coefficient C according to the frequency point and AGC i ×C i_close2 For Data i_open2 (i=1..16) to obtain Data i_correct ＝Data i_open2 ×C i ×C i_close2 Will Data i_correct Transmitting to the upper computer for analysis, obtaining the calibration performance index through a formula
After calibration, the amplitude difference between the channels is within 0.5dB, the phase difference is within 6 degrees, and the system requirement is met. The method takes the radar as test equipment and tested equipment at the same time, and realizes the self-receiving calibration. The full-link channel calibration of the integrated digital array radar can be realized, the harsh performance requirements of the consistency of the calibration coupling path and the channel amplitude of each level of link are reduced, and the overall complexity of the calibration is reduced.
The product provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the invention. It should be noted that it will be apparent to those skilled in the art that several improvements and modifications can be made to the invention without departing from the inventive concept, and these improvements and modifications fall within the scope of the appended claims.
Claims (8)
1. A method for calibrating a receive channel of an integrated digital array radar, the method comprising:
s101, when a test field does not meet far-field test conditions, determining a phase error and correcting the phase error;
s102, radar calibration test preparation, comprising: assembling the radar of the integrated digital array to be tested on a turntable bracket, connecting a calibration signal output end of the radar to a radiation feed element for testing through a radio frequency cable, and completing connection of the radar and an upper computer;
s103, generating a calibration signal waveform of the radar, receiving echo signals fed back by the radiation feed element, processing the echo signals, and outputting the maximum value of the amplitude in all the one-dimensional complex data;
s104, performing open loop receiving channel fixed amplitude phase difference test on the maximum value to determine a calibration coefficient C i_open And storing in an upper computer, and determining calibration coefficients by a closed loop receiving channel fixed amplitude phase difference testAnd storing in an upper computer;
s105, fixed amplitude phase difference calculation of a receiving channel comprises the following steps: the calibration coefficients determined by closed loop and open loop reception and ratio is performed to determine the fixed error C i The method comprises the steps of carrying out a first treatment on the surface of the The upper computer fixes the error C i Transmitting the data to a radar for storage;
s106, the fixed error C i Loading the calibration coefficient C into a system processing module of the radar, and powering up the radar after powering down the radar to obtain a calibration coefficient C i_close2 ；
S107, testing the open loop receiving channel loading calibration coefficient to determine the final calibration performance parameter C i_correct 。
2. The method for calibrating a reception channel for an integrated digital array radar according to claim 1, wherein determining a phase error in S101 includes:
the radar is arranged on the turntable support, the turntable rotates to a mechanical zero position, the output end of the radar is connected with a radiation feed element of a test field, and the input end of the radar vector network is sequentially connected with each array surface sub-array radio frequency port Ant i (i=1..n), where N is the number of subarrays of the radar array, and the readings C of each vector network are recorded Ant_i (i=1..n), plane wave error is calculated
And correcting the plane wave error.
3. The method for calibrating a receiving channel of an integrated digital array radar according to claim 2, wherein a recorder of the radar derives data, the recorder is connected to a debugging software of a host computer, and the processing of the echo signal in S103 includes:
the radar generates N Pulse A calibration signal of each pulse, wherein each pulse signal is a modulated continuous wave signal with zero initial phase, and the baseband frequency of the continuous wave signal is set to be a preset proportion of the sampling rate;
after each subarray of the radar receives the signal and carries out digital preprocessing, fourier transform FFT is carried out along a distance dimension, and then one-dimensional complex data is obtained by summation along a pulse dimension;
outputting the maximum value of the amplitude in all the one-dimensional complex Data, wherein the maximum value is recorded as Data i (i＝1..N)。
4. The receiving channel calibration method for an integrated digital array radar according to claim 3, wherein the performing an open loop receiving channel fixed amplitude phase difference test on the maximum value in S104 includes:
during testing, the radar controls the directional azimuth angle and the pitch angle of a directional diagram to be 0 degrees under a radar system, traverses the frequency point of the radar, and sets the AGC of each subarray radio frequency conversion channel module of the radar to be 0dB;
recording the processing results of the channel modules under each frequency point, and recording the processing results as Data i_open (i=1..n), and processing result Data i_open (i=1..N) transmitting to the debugging software of the upper computer, and generating calibration coefficients under each frequency point by the debugging softwareAnd stored.
5. The method for calibrating a receiving channel of an integrated digital array radar according to claim 4, wherein the closed loop receiving channel fixed amplitude phase difference test in S104 includes:
during testing, the radar controls the directional azimuth angle and pitch angle of a directional diagram to be 0 degrees under a radar system, traverses the frequency point of the radar, sets the digital gain control AGC of each subarray radio frequency channel module to be 0dB, records the processing result of each channel as Data i_close (i=1..N) and transmitting to the debugging software of the upper computer, wherein the debugging software generates calibration coefficients under each frequency pointAnd stored in the upper computer.
6. The method for calibrating a reception channel for an integrated digital array radar according to claim 5, wherein the fixed error C is determined in S105 i Comprising:
fixing error of each frequency point
7. The method for calibrating a reception channel of an integrated digital array radar according to claim 6, wherein S106 is the fixed error C i Loading the radar data into a system processing module of the radar and carrying out radarAfter power-down, power-up is performed to obtain a calibration coefficient C i_close2 Comprising:
again closed loop receive channel amplitude phase difference testing, wherein:
the radar is powered on after a preset time interval is reserved after the radar is powered off;
performing closed loop error test again, traversing radar frequency points from 8-12GHz at intervals of 0.01GHz, traversing AGC from 0-56dB at intervals of 2dB, controlling all subarrays to be the same AGC, recording each frequency point of each channel and recording Data of processing results under the AGC i_close2 (i=1..16), generating coefficients under AGC at different frequency pointsAnd stored in the processing subsystem memory of the radar.
S107, testing the open loop receiving channel loading calibration coefficient to determine the final calibration performance parameter C i_correct。
8. The method for calibrating a receive channel of an integrated digital array radar according to claim 7, wherein an open loop receive channel is loaded with calibration coefficient tests to determine a final calibration performance parameter C i_correct Comprising:
adjusting the wave control pointing direction to pitch by 0 degrees;
traversing the frequency point and the digital gain control AGC of the radar, and processing the echo signal to obtain a processing result Data i_open2 (i=1..n.) and performing a calibration, the method of calibration:
finding out corresponding calibration coefficient C according to frequency point and AGC of radar i ×C i_close2 And Data i_open2 (i=1..n) performing the calibration processing to obtain a calibrated processing result Data i_correct The expression is:
Data i_correct ＝Data i_open2 ×C i ×C i_close2 ；
the calibrated processing result Data i_correct Transmitting to the upper computer for analysis, calculating to obtain final calibration performance parameters by means of ratio
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| CN118174730A (en) * | 2024-05-15 | 2024-06-11 | 贵州航天电子科技有限公司 | Amplitude-phase compensation method and device for multichannel narrow pulse signals and electronic equipment |
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