Phase deviation correction method for hrws SAR channel based on clutter cancellation
A technology of phase deviation and correction method, which is applied in the field of communication, can solve the problems of large amount of calculation, and achieve the effect of small amount of calculation, guaranteed imaging processing performance, and high-precision SAR imaging
Active Publication Date: 2018-02-06
SHANGHAI SATELLITE ENG INST
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Zhang Shuangxi et al. proposed a method of estimating the phase deviation by maximizing the contrast of the focused image, but this method has a large amount of calculation; Li Zhenfang et al. proposed to use the subspace estimation theory to give a phase deviation correction algorithm, but this method needs to be characterized. Value decomposition, large amount of calculation
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[0042] This embodiment provides a HRWS SAR channel phase deviation correction method based on clutter cancellation, including the following steps:
[0043] Step 1, input multi-channel HRWS SAR echo data: input azimuth multi-channel HRWS SAR echo data, the number of channels is M;
[0044] Step 2, azimuth Fourier transform: perform azimuth Fourier transform on the echo data of each channel;
[0045] Step 3, select the reference channel: select the first channel as the channel phase deviation reference channel;
[0046] Step 4, calculating the signal component s of each channel for reconstructing the echo of the reference channel;
[0047] Step 5, constructing a clutter cancellation optimization cost function;
[0048] Step 6, through the clutter cancellation optimization cost function obtained in step 5, the clutter cancellation problem is converted into a constant modulus optimization problem;
[0049] Step 7. With the goal of maximizing clutter cancellation, the classical ...
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The invention discloses a HRWS SAR channel phase deviation correction method based on clutter cancellation. The problem on how to correct phase deviation in azimuth multi-channel SAR channel imaging processing is mainly solved. The method comprises the following steps: (1) inputting multi-channel HRWS SAR echo data; (2) carrying out azimuth Fourier transform on the echo data of each channel; (3) selecting a reference channel; (4) calculating the signal component, for reconstructing reference channel echo, of each channel; (5) constructing a clutter cancellation optimization cost function; (6) converting the problem of clutter cancellation into the problem of constant modulus optimization; (7) solving the problem of constant modulus optimization; and (8) outputting the inter-channel phase deviation. By adopting the HRWS SAR channel phase deviation correction method, the phase deviation problem in azimuth multi-channel HRWS SAR imaging processing can be solved effectively, and the imaging processing performance of an azimuth multi-channel HRWS SAR system can be guaranteed effectively.
Description
technical field [0001] The invention belongs to the technical field of communication, and further relates to an azimuth multi-channel high resolution wide swath (HRWS) synthetic aperture radar (SAR) system channel phase deviation correction method based on clutter cancellation. Background technique [0002] Synthetic Aperture Radar (SAR) has been widely used in marine monitoring and agricultural census because of its all-weather and all-weather high-resolution earth observation capabilities. Azimuth multi-channel SAR can effectively overcome the "minimum antenna area" constraint faced by traditional single-channel SAR systems, and realize high-resolution wide-swath (High-Resolution and Wide-Swath, HRWS) earth observation. Under this system, the radar pulse repetition frequency (Pulse Repetition Frequency, PRF) is lower than the Doppler bandwidth of each receiving channel signal of the radar system, and the system needs to use digital beamforming technology to reconstruct the...
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IPC IPC(8): G01S13/90G01S7/02
CPCG01S7/02G01S13/90G01S13/904
Inventor 刘艳阳张久玲陈重华陈国忠薛伶玲徐有栓李东霖
Owner SHANGHAI SATELLITE ENG INST