CN110018455B - Amplitude-phase consistency error calibration measurement method between satellite-borne SAR imaging receiving channels - Google Patents
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Abstract
The invention relates to a method for measuring amplitude phase consistency error calibration between satellite-borne SAR imaging receiving channels in the technical field of satellite-borne SAR imaging, which comprises the following steps: (1) The SAR system working state and parameter setting comprises signal working bandwidth, pulse width, working mode, stand-alone main backup state, PRF value and starting time; (2) Compiling and uploading instruction packets according to the working state and parameter setting values of the system to realize starting of the SAR system, and recording echo data; (3) Performing format conversion and pulse pressure processing on the recorded echo data, and extracting amplitude and phase at a peak value after pulse pressure is extracted for comparison analysis; (4) The method can finish measurement of the consistency errors of the imaging receiving channels under the conditions of different bandwidths and different main backup states without near-field scanning measurement of a microwave darkroom, and can simultaneously monitor the consistency errors of the imaging receiving channels rapidly and conveniently for many times.
Description
Technical Field
The invention relates to the technical field of satellite-borne SAR imaging, in particular to a method for measuring amplitude phase consistency error calibration between satellite-borne SAR imaging receiving channels.
Background
One of the methods for measuring the amplitude-phase consistency errors among satellite-borne SAR imaging receiving channels is to use a near-field scanning frame to measure the amplitude-phase consistency errors in a microwave darkroom environment, and the method is characterized by high precision, can completely cover the whole receiving channel link, but has high requirements on measuring conditions (including test equipment and sites) and is not particularly flexible, so that the measurement and monitoring of the amplitude-phase consistency errors can not be carried out at any time and any site at any time.
One of the space-borne SAR imaging receiving channel amplitude-phase consistency error measurement methods is to acquire amplitude-phase data of each T/R receiving channel in a time sharing manner through a single T/R receiving calibration working mode, then to synthesize and stack each T/R receiving calibration echo data in a data domain according to the distribution relation of each T/R channel in the imaging receiving channel, to perform matched filtering pulse pressure processing on the stacked data, and to take the amplitude and the phase at each peak value to perform the difference between the maximum value and the minimum value. The method is characterized by simple requirements and no need of developing a full-array-surface non-delay receiving calibration mode by system software, but can not finish representing a normal full-array-surface receiving working state because single T/R receiving calibration work belongs to time-sharing measurement.
With the continuous development of synthetic aperture radar satellites, particularly the requirements of high resolution and wide coverage are higher and higher, the multi-receiving channel imaging system is in a great trend of future satellite-borne SAR application, and with the continuous improvement of imaging quality requirements, higher requirements are put forward on the control of inter-channel amplitude phase consistency errors. Firstly, strict control of the consistency error of the amplitude phase between the imaging receiving channels is required, and the consistency level of the amplitude phase between the imaging receiving channels is improved; and secondly, the measurement and monitoring of the consistency level of the amplitude phase among the imaging receiving channels are required to be completed efficiently. Along with the continuous improvement of the design level and development capability of the spaceborne SAR system, the current radar receiver and the data former have the capability of independently receiving, acquiring, encoding and fusing echo data of each imaging receiving channel, and provide conditions for efficient calibration measurement of amplitude phase consistency errors among the spaceborne SAR imaging receiving channels.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for measuring the amplitude phase consistency error calibration between satellite-borne SAR imaging receiving channels. The method realizes measurement and monitoring of amplitude phase consistency errors among satellite-borne SAR imaging receiving channels, improves measurement accuracy and meets the simplicity of implementation.
The invention relates to a method for measuring amplitude phase consistency error calibration between satellite-borne SAR imaging receiving channels, which comprises the following steps:
step one: the SAR system working state and parameter setting comprises signal working bandwidth, pulse width, working mode, stand-alone main backup state, PRF value and starting time;
step two: compiling and uploading instruction packets according to the working state and parameter setting values of the system to realize starting of the SAR system, and recording echo data;
step three: performing format conversion and pulse pressure processing on the recorded echo data, and extracting amplitude and phase at a peak value after pulse pressure is extracted for comparison analysis;
step four: and (3) repeating the first step and the third step to finish the consistency error measurement of the imaging receiving channel width under different bandwidths and different main backup states.
Preferably, the step one sets working states and parameters of the satellite-borne SAR system, selects signal bandwidths and pulse widths of the radar receiver in the working states of multiple receiving channels, selects a full-array non-delay receiving calibration mode as a working mode, sets a stand-alone main backup working state, and sets PRF and a starting time length value according to requirements, wherein the starting time length is set to monitor stability of consistency errors of the amplitude of each receiving channel for a long time.
Preferably, the working state and parameters of the satellite-borne SAR system are set, firstly, the corresponding multi-receiving channel working bandwidth is selected to realize the working state that the radar receiver and the data former are in multi-channel independent receiving, collecting and encoding, and meanwhile, the full array non-delay receiving calibration working mode is selected; secondly, setting the main backup working state of each single machine of the system, and realizing the coverage of testing various combined working states; and finally, setting a PRF value and a starting-up time according to the test requirement.
Preferably, the second step is to compile and upload instruction packets according to the working state and parameter setting values of the SAR system to realize the start-up of the SAR system as required, the satellite-borne SAR system selects a full-array-surface non-delay receiving calibration working mode so as to meet the condition that all T/R channels of an array surface are in a receiving-only working state at the same time, and then record echo data.
Preferably, the third step firstly performs data format conversion on the recorded echo data according to a certain pulse interval to obtain echo complex data corresponding to each receiving channel; secondly, processing echo complex data of each receiving channel by adopting a matched filtering pulse pressure method, and extracting amplitude and phase at a peak value after pulse pressure interpolation; and finally, carrying out difference between the maximum amplitude value and the minimum amplitude value at the peak value of each receiving channel at the corresponding pulse position, and carrying out difference between the maximum phase value and the minimum phase value at the peak value of each receiving channel, thereby obtaining an amplitude-phase consistency error measurement result.
Preferably, in the fourth step, different system working states and parameters including different signal bandwidths and pulse widths, different stand-alone main backup working states and the like are repeatedly set under the condition that the full array surface non-delay receiving calibration working mode is fixed, and the first to third steps are repeated to obtain the measurement results of the consistency errors of the amplitude phase of the receiving channels under the different bandwidths and the different main backup states.
Preferably, in the first step, the specific operation steps of setting the working state and parameters of the SAR system are that firstly, selecting the bandwidth of the working signals of the multiple receiving channels and setting the radar receiver to be in the independent working state of the multiple receiving channels; secondly, the satellite-borne SAR working mode is set to be a full-array-surface non-delay receiving calibration working mode, wherein the full-array-surface non-delay receiving calibration path is as follows: frequency modulation signal source- & gt inner scaler (non-delay) & gt antenna scaling network- & gt antenna receiving channel- & gt microwave combination- & gt radar receiver.
Preferably, in the third step, the recorded echo data is subjected to data format conversion to obtain echo complex data of each imaging receiving channel, and FFT conversion is performed, where frequency domain data of each imaging receiving channel is S 1_int (f)、S 2_int (f)……S N_int (f) Respectively, each ofPerforming matched filtering processing, wherein the matched filtering functions are H respectively 1 (f)、H 2 (f)……H N (f) Output as S after matching pulse pressure 1_out (f)＝S 1_out (f)·H 1 (f)、S 2 (f)＝S 2_out (f)·H 2 (f)……S N (f)＝S N_out (f)·H N (f) Interpolation processing is carried out after the data pulse pressure of each channel to obtain the amplitude value and the phase value at the peak value, wherein the amplitude value (unit dB) at the peak value is F respectively 1_max 、F 2_max ……F N_max The phase value (unit degree) at the peak is P 1_max 、P 2_max ……P N_max The amplitude uniformity measurement was Δf=max (F 1_max 、F 2_max ……F N_max )-min(F 1_max 、F 2_max ……F N_max ) The phase consistency measurement is Δp=max (P 1_max 、P 2_max ……P N_max )-min(P 1_max 、P 2_max ……P N_max )。
Compared with the prior art, the invention has the following beneficial effects:
1. the method for measuring the amplitude phase consistency error calibration between the satellite-borne SAR imaging receiving channels mainly solves the problem of measuring the amplitude phase consistency error between the satellite-borne SAR imaging receiving channels, can finish the measurement of the amplitude phase consistency error between the imaging receiving channels under the condition of no need of near-field scanning measurement of a microwave darkroom, and can simultaneously monitor the amplitude phase consistency error between the imaging receiving channels rapidly and conveniently for many times;
2. the method for measuring the amplitude phase consistency error calibration of the spaceborne SAR imaging receiving channels has a good effect on measuring the amplitude phase consistency of the spaceborne SAR imaging receiving channels, and can complete monitoring of the amplitude phase consistency error stability of the imaging receiving channels;
3. the application of the method for measuring the amplitude phase consistency error calibration between the satellite-borne SAR imaging receiving channels can effectively simplify the measuring method and improve the measuring efficiency, and meanwhile, the measuring precision is ensured.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings.
FIG. 1 is a flow chart of the measurement of amplitude phase consistency error calibration between spaceborne SAR imaging channels;
FIG. 2 is a flow chart of the data processing of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Examples
In this embodiment, the method for measuring amplitude phase consistency error calibration between satellite-borne SAR imaging receiving channels is introduced as follows: step one: according to the amplitude phase consistency error calibration measurement flow chart of the spaceborne SAR imaging channels shown in the figure 1, the working state and parameter setting of the spaceborne SAR system are completed, wherein the working state and parameter setting comprises a signal working bandwidth, a pulse width, a system working mode, a single machine main backup working state, a PRF value and a startup duration value;
step two: according to the amplitude phase consistency error calibration measurement flow chart of the spaceborne SAR imaging channels shown in fig. 1, command package compiling and uploading are completed, and echo data are stored through ground recording equipment;
step three: completing data processing and analysis according to the data processing flow chart shown in fig. 2, performing distance pulse pressure processing on the calibration echo data of each imaging receiving channel, extracting amplitude and phase values at peak values, and respectively taking differences between a maximum amplitude value and a maximum phase value and between a minimum amplitude value and a minimum phase value to obtain a channel-to-channel amplitude consistency measurement result;
step four: and repeating the first step and the third step for multi-working condition measurement to obtain amplitude-phase consistency error measurement results under different signal bandwidths and different main backup states.
The present invention will be described in detail below.
The invention relates to amplitude and phase measurement, in particular to an amplitude and phase consistency error measurement technology for imaging receiving channels of a satellite-borne synthetic aperture radar, which relates to amplitude and phase consistency error measurement among imaging receiving channels of the satellite-borne synthetic aperture radar and discloses an amplitude and phase consistency error calibration measurement method among imaging receiving channels of the satellite-borne SAR. The method comprises the steps of setting the working state of the SAR system, selecting an internal calibration working mode and processing calibration data. The invention aims to provide a method for measuring amplitude phase consistency error calibration among space-borne SAR imaging receiving channels, which adopts the technical scheme that the method is based on independent receiving and collecting of echo data of the imaging receiving channels, and realizes high-efficiency and high-precision space-borne SAR imaging receiving channel amplitude phase consistency error calibration measurement by adopting a full-array-surface non-delay receiving calibration working mode to record calibration data and then carrying out pulse pressure processing on the receiving calibration echo data of each imaging receiving channel. The method realizes measurement and monitoring of amplitude phase consistency errors among satellite-borne SAR imaging receiving channels, and simultaneously aims at improving measurement accuracy and realizing simplicity.
The invention relates to a method for measuring amplitude phase consistency error calibration between satellite-borne SAR imaging receiving channels, which comprises the following steps:
step one: the SAR system working state and parameter setting comprises signal working bandwidth, pulse width, working mode, stand-alone main backup state, PRF value and starting time;
step two: compiling and uploading instruction packets according to the working state and parameter setting values of the system to realize starting of the SAR system, and recording echo data;
step three: performing format conversion and pulse pressure processing on the recorded echo data, and extracting amplitude and phase at a peak value after pulse pressure is extracted for comparison analysis;
step four: and (3) repeating the first step and the third step to finish the consistency error measurement of the imaging receiving channel width under different bandwidths and different main backup states.
Preferably, the working state and parameters of the satellite-borne SAR system are set, firstly, the corresponding multi-receiving channel working bandwidth is selected to realize the working state that the radar receiver and the data former are in multi-channel independent receiving, collecting and encoding, and meanwhile, the full array non-delay receiving calibration working mode is selected; secondly, setting the main backup working state of each single machine of the system, and realizing the coverage of testing various combined working states; and finally, setting a PRF value and a starting-up time according to the test requirement.
Preferably, the second step is to compile and upload instruction packets according to the working state of the system and the parameter setting value, and the SAR system is started to record and store echo data.
Preferably, the third step firstly performs data format conversion on the recorded echo data according to a certain pulse interval to obtain echo complex data corresponding to each receiving channel; secondly, processing echo complex data of each receiving channel by adopting a matched filtering pulse pressure method, and extracting amplitude and phase at a peak value after pulse pressure; and finally, carrying out difference between the maximum amplitude value and the minimum amplitude value at the peak value of each receiving channel at the corresponding pulse position, and carrying out difference between the maximum phase value and the minimum phase value at the peak value of each receiving channel, namely, measuring an amplitude-phase consistency error.
Preferably, the fourth step is to repeat the first step to the third step to obtain the measurement result of the consistency error of the amplitude phase between the receiving channels in different bandwidths and different main backup states.
More specifically, the main content of the invention is:
1. setting SAR system working state and parameters
Firstly, selecting the bandwidth of a multi-receiving channel working signal and setting a radar receiver to be in an independent working state of the multi-receiving channel; secondly, the satellite-borne SAR working mode is set to be a full-array-surface non-delay receiving calibration working mode, wherein the full-array-surface non-delay receiving calibration path is as follows: frequency modulation signal source- & gt inner scaler (non-delay) & gt antenna scaling network- & gt antenna receiving channel- & gt microwave combination- & gt radar receiver.
2. Imaging receive channel scaling data processing
Performing data format conversion on the recorded echo data to obtain echo complex data of each imaging receiving channel, and performing FFT conversionThe frequency domain data of each imaging receiving channel is S 1_int (f)、S 2_int (f)……S N_int (f) Respectively performing matched filtering processing, wherein the matched filtering functions are H respectively 1 (f)、H 2 (f)……H N (f) Output as S after matching pulse pressure 1_out (f)＝S 1_out (f)·H 1 (f)、S 2 (f)＝S 2_out (f)·H 2 (f)……S N (f)＝S N_out (f)·H N (f) Interpolation processing is carried out after the data pulse pressure of each channel to obtain the amplitude value and the phase value at the peak value, wherein the amplitude value (unit dB) at the peak value is F respectively 1_max 、F 2_max ……F N_max The phase value (unit degree) at the peak is P 1_max 、P 2_max ……P N_max The amplitude uniformity measurement was Δf=max (F 1_max 、F 2_max ……F N_max )-min(F 1_max 、F 2_max ……F N_max ) The phase consistency measurement is Δp=max (P 1_max 、P 2_max ……P N_max )-min(P 1_max 、P 2_max ……P N_max )。
In summary, the method for measuring the inter-amplitude phase consistency error calibration of the spaceborne SAR imaging receiving channels mainly solves the problem of measuring the inter-amplitude phase consistency error of the spaceborne SAR imaging receiving channels, can finish the measurement of the inter-amplitude phase consistency error of the imaging receiving channels under the condition of no need of near-field scanning measurement of a microwave darkroom, and can simultaneously monitor the inter-amplitude phase consistency error of the imaging receiving channels rapidly and conveniently for many times; the method for measuring the amplitude phase consistency error calibration of the spaceborne SAR imaging receiving channels has a good effect on measuring the amplitude phase consistency of the spaceborne SAR imaging receiving channels, and can complete monitoring of the amplitude phase consistency error stability of the imaging receiving channels; the application of the method for measuring the amplitude phase consistency error calibration between the satellite-borne SAR imaging receiving channels can effectively simplify the measuring method and improve the measuring efficiency, and meanwhile, the measuring precision is ensured.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (3)
1. The method for measuring the amplitude phase consistency error calibration between satellite-borne SAR imaging receiving channels is characterized by comprising the following steps of:
step one: the SAR system working state and parameter setting comprises signal working bandwidth, pulse width, working mode, stand-alone main backup state, PRF value and starting time; firstly, selecting a signal bandwidth and pulse width of a radar receiver in a multi-receiving-channel working state to realize that the radar receiver and a data former are in a multi-channel independent receiving, collecting and coding working state, and simultaneously selecting a full-array-surface non-delay receiving calibration mode as a working mode; secondly, setting the main backup working state of each single machine of the system, and realizing the coverage of testing various combined working states; setting PRF and a starting time length value according to the requirement, wherein the starting time length is set to monitor the stability of the consistency error of the amplitude of each receiving channel for a long time; the full array surface non-delay receiving calibration path is as follows: frequency modulation signal source, internal scaler, antenna scaling network, antenna receiving channel, microwave combination and radar receiver;
step two: compiling and uploading instruction packets according to the working state and parameter setting values of the SAR system to realize starting of the SAR system according to requirements, selecting a full array surface non-delay receiving calibration working mode by the satellite-borne SAR system so as to meet the condition that all T/R channels of the array surface are in a receiving only working state at the same time, and then recording echo data;
step three: performing format conversion and pulse pressure processing on the recorded echo data, and extracting amplitude and phase at a peak value after pulse pressure is extracted for comparison analysis;
step four: repeating the first step and the third step to finish the consistency error measurement of the imaging receiving channel width under different bandwidths and different main backup states; in particular, under the condition that the full array surface non-delay receiving calibration working mode is fixed, different system working states and parameters including different signal bandwidths, different pulse widths and different single machine main backup working states are repeatedly set, and the step one to the step three are repeated to obtain the measurement results of the consistency errors of the amplitude phase of the receiving channels under the different bandwidths and the different main backup states.
2. The method for measuring amplitude phase consistency error calibration between satellite-borne SAR imaging receiving channels according to claim 1, wherein the third step is to firstly perform data format conversion on recorded echo data according to a certain pulse interval to obtain echo complex data corresponding to each receiving channel; secondly, processing echo complex data of each receiving channel by adopting a matched filtering pulse pressure method, and extracting amplitude and phase at a peak value after pulse pressure interpolation; and finally, carrying out difference between the maximum amplitude value and the minimum amplitude value at the peak value of each receiving channel at the corresponding pulse position, and carrying out difference between the maximum phase value and the minimum phase value at the peak value of each receiving channel, thereby obtaining an amplitude-phase consistency error measurement result.
3. The method for calibrating and measuring amplitude-phase consistency errors among satellite-borne SAR imaging receiving channels as set forth in claim 1, wherein in the third step, the recorded echo data is subjected to data format conversion to obtain echo complex data of each imaging receiving channel, and FFT conversion is performed, and frequency domain data of each imaging receiving channel is S 1_int (f)、S 2_int (f)……S N_int (f) Respectively performing matched filtering processing, wherein the matched filtering functions are H respectively 1 (f)、H 2 (f)……H N (f) Output as S after matching pulse pressure 1_out (f)＝S 1_out (f)·H 1 (f)、S 2 (f)＝S 2_out (f)·H 2 (f)……S N (f)＝S N_out (f)·H N (f) Interpolation processing is carried out after the data pulse pressure of each channel to obtain the amplitude value and the phase value at the peak, wherein the amplitude value at the peak is F respectively 1_max 、F 2_max ……F N_max The phase value at the peak value is P 1_max 、P 2_max ……P N_max The amplitude uniformity measurement was Δf=max (F 1_max 、F 2_max ……F N_max )-min(F 1_max 、F 2_max ……F N_max ) The phase consistency measurement is Δp=max (P 1_max 、P 2_max ……P N_max )-min(P 1_max 、P 2_max ……P N_max )。
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| CN110888916B (en) * | 2019-11-21 | 2023-03-31 | 中国科学院电子学研究所 | Data processing method, device, equipment and storage medium among multiple channels |
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| CN112098961B (en) * | 2020-09-09 | 2024-09-20 | 北京空间飞行器总体设计部 | Multi-polarization SAR load internal calibration mode design and data analysis method |
| CN112462175A (en) * | 2020-11-12 | 2021-03-09 | 中国电子科技集团公司第二十九研究所 | Radio frequency multichannel switching device |
| CN114488044B (en) * | 2022-01-14 | 2024-09-10 | 上海卫星工程研究所 | Phased array SAR antenna channel amplitude-phase multidimensional monitoring method and system |
| CN115128564A (en) * | 2022-09-02 | 2022-09-30 | 中国科学院空天信息创新研究院 | Method and device for polarization calibration of lunar orbit synthetic aperture radar |
| CN118151111B (en) * | 2024-05-11 | 2024-08-30 | 中国电子科技集团公司第十四研究所 | Novel high-amplitude phase-stable InSAR radar architecture based on non-delay internal calibration |
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