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: 2011-11-16
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 su

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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 flow chart of the principle of the present invention. This process is beneficial to improve the performance of the along-course interferometric method for dual-channel low-frequency SAR. The overall process consists of five steps:

[0094] The first step is the error correction of receiver frequency characteristics based on echo. The frequency characteristic error of the receiver is corrected for each channel echo, and the corrected time-frequency domain echo is obtained. Among them, the equalizer E used in this step i (f) Obtained by the closed-loop test before the radar works, see "The Correction of I and Q Errors in a Coherent Processor" edited by F.E.Churchill, W.G.Ogar, B.J.Thompson, IEEE Transactions on Aerospace and Electronic Systems, Vol.17, No. .1, 1981, pp.131-137 and Lu Xiaolei, Su Junhai, Xing Mengdao, Zhang Shouhong, "Research on the Error Correction Method of Three-channel SAR-GMTI", System Engineering and Electronic Technol...

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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, synthetic aperture radar) signal processing, relates to the technical fields of RFI (Radio Frequency Interference, radio frequency interference) signal processing and along-course interference signal processing, and particularly relates to a dual-channel low-frequency SAR along-course interference RFI suppression and error correction methods for Fig. Background technique [0002] The interferogram along the course can be obtained by multiplying the complex image conjugates of the two signal channels received by the radar antenna placed along the course. For the sake of brevity, the interferogram along the course will be referred to as the interferogram below. Interferograms have many applications in military and civilian remote sensing detection. For example, a ground moving target indication (Ground Moving Target Indication, GMTI for short) can be obtained b...

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Application Information

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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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