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SAR interference suppression method and device based on De-Chirp technology

An interference suppression and non-interference technology, applied in the field of signal processing, can solve the problems of SAR data interference signal and so on

Pending Publication Date: 2020-09-04
HENAN UNIVERSITY
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Problems solved by technology

[0006] The purpose of the present invention is to provide a SAR interference suppression method and device based on De-Chirp technology, to solve the problem that existing SAR data is subjected to chirp interference signals

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  • SAR interference suppression method and device based on De-Chirp technology
  • SAR interference suppression method and device based on De-Chirp technology
  • SAR interference suppression method and device based on De-Chirp technology

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Embodiment Construction

[0057] Hereinafter, the present invention will be described in detail with reference to the drawings and in conjunction with the embodiments. Each example is provided by way of explanation of the present invention without limiting the present invention. In fact, it will be clear to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the present invention. For example, features shown or described as part of one embodiment can be used in another embodiment to yield a still further embodiment. Therefore, it is expected that the present invention includes such modifications and variations falling within the scope of the appended claims and their equivalents.

[0058] figure 1 It is a flowchart of a method for suppressing SAR narrowband interference based on De-Chirp technology in the present invention. Such as figure 1 As shown, the method includes:

[0059] Step 1: The interference detection...

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Abstract

The invention relates to SAR interference suppression method and device based on De-Chirp technology. The method comprises the steps of: 1, performing interference signal detection and judgment on SARsingle echo data; 2, when it is judged that the interference signal exists, performing De-chirp on the linear frequency modulation interference signal through De-Chirp operation, and the fixed frequency and bandwidth of the linear frequency modulation interference signal are obtained; 3, carrying out variational mode decomposition on the echo data with the interference signals, and k intrinsic mode functions including interference and non-interference are obtained; step 4, constructing a wave trap by using fixed frequency and bandwidth, and then operating the intrinsic mode function containing interference to obtain an intrinsic mode function after interference suppression; and step 5, carrying out reconstruction and inverse De-Chirp operation on the intrinsic mode function without interference and without interference to obtain SAR single echo data after interference suppression. SAR linear frequency modulation interference can be suppressed, and SAR imaging quality can be improved.

Description

Technical field [0001] The invention relates to the technical field of signal processing, in particular to a method and device for suppressing SAR interference based on De-Chirp technology. Background technique [0002] Radar radio frequency interference (Radio Frequency Interference) usually refers to man-made electromagnetic interference, which mainly refers to the non-coherent interference radiated by communication equipment and other equipment that work in the same frequency band as Ultra-Bandwidth Synthetic Aperture Radar (SAR). Sentinel-1A, Sentinel-1B, RCM1 / 2 / 3, RADARSAT-2, GAOFEN-3, etc. are all known C-band sensors. In recent years, C-band signals from other sensors have seriously interfered with Sentinel-1A, Sentinel- 1B, GAOFEN-3, etc. There are a large number of phenomena such as "stripes" and "noise" in satellite images, which leads to a decrease in image quality and a decrease in signal-to-noise ratio, which seriously affects the normal working requirements of SAR....

Claims

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Application Information

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IPC IPC(8): G01S7/36G01S13/90
CPCG01S7/36G01S13/90
Inventor 李宁吕宗森郭拯危闵林毋琳赵建辉
Owner HENAN UNIVERSITY
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