Method for radio frequency interference suppression and error correction of low-frequency synthetic aperture radar

A synthetic aperture radar, error correction technology, used in radio wave measurement systems, instruments, etc.

Inactive Publication Date: 2012-10-10
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0006] The invention provides an RFI suppression and error correction method suitable for low-frequency SAR, which solves the problems of RFI detection and suppression and various error corrections of dual-channel low-frequency SAR interferograms, and improves the performance of the along-course interference method

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  • Method for radio frequency interference suppression and error correction of low-frequency synthetic aperture radar
  • Method for radio frequency interference suppression and error correction of low-frequency synthetic aperture radar
  • Method for radio frequency interference suppression and error correction of low-frequency synthetic aperture radar

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Embodiment Construction

[0093] figure 1 It is a schematic diagram of the principle flow of the present invention. This process is conducive to improving the performance of the dual-channel low-frequency SAR along-track interference method. The overall process consists of five steps:

[0094] The first step is to correct the frequency characteristic error of the receiver based on the echo. Correct the frequency characteristic error of the receiver for the echo of each channel, and obtain the corrected time-frequency domain echo. Among them, the equalizer E used in this step i (f) Obtained through closed-loop testing before radar work, see "The Correction of I and Q Errors in a Coherent Processor" edited by FEChurchill, WGOgar, and BJ Thompson, IEEE Transactions on Aerospace and Electronic Systems, Vol. 17, No .1, 1981, pp.131-137 and Lv Xiaolei, Su Junhai, Xing Mengdao, Zhang Shouhong "Research on Three-channel SAR-GMTI Error Correction Method", System Engineering and Electronic Technology, Vol.30, No...

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Abstract

The invention provides a method for the RFI (radio frequency interference) suppression and error correction of a low-frequency SAR (synthetic aperture radar). The technical scheme comprises five steps of: step 1, receiver frequency characteristic error correction based on an echo; step 2, distance spectrum equalization suppression and SAR imaging based on a corrected time-frequency domain echo; step 3, registration based on a time domain image; step 4, RFI detection and suppression based on a time-frequency domain; and step 5, residual error correction. The method provided by the invention can solve the RFI detection and suppression of a double-channel low-frequency SAR interferogram, as well as various error correction problems, increase the performance of an along-track interferometry method, and lay a good foundation for the follow-up associated processing.

Description

Technical field [0001] The invention belongs to the technical field of low-frequency SAR (Synthetic Aperture Radar) signal processing, and relates to the technical field of RFI (Radio Frequency Interference) signal processing and along-heading interference signal processing, and particularly relates to the along-heading interference suitable for dual-channel low-frequency SAR Figure of RFI suppression and error correction methods. Background technique [0002] By multiplying the complex image conjugates of the two signal channels received by the radar antenna placed along the course, the interferogram along the course can be obtained. For the sake of brevity, the interferogram along the course will be referred to as the interferogram in the following. Interferograms have many applications in military and civilian remote sensing detection. For example, by detecting the interference amplitude and the interference phase on the interferogram, a ground moving target indication (GMTI...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40G01S7/41
Inventor 黄晓涛范崇祎许忠良雷鹏正刘文彦周智敏
Owner NAT UNIV OF DEFENSE TECH
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