SAR echo broadband interference suppression method based on multi-component joint reconstruction

A technology of joint reconstruction and broadband interference, which is applied in the direction of measurement devices, radio wave measurement systems, radio wave reflection/reradiation, etc., can solve problems such as interference, and achieve the effect of high-precision filtering and recovery of SAR echoes

Active Publication Date: 2021-08-10
XIDIAN UNIV
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Problems solved by technology

However, this method uses a multi-look approximation of single-channel data, which is based on the assumption that the interference has approximately stable frequencies or frequency bands within a synthetic aperture time
Therefore, the method is not suitable for interference with variable frequency bands

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  • SAR echo broadband interference suppression method based on multi-component joint reconstruction
  • SAR echo broadband interference suppression method based on multi-component joint reconstruction
  • SAR echo broadband interference suppression method based on multi-component joint reconstruction

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[0028] The embodiments of the present invention will be described in detail below in conjunction with the examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention.

[0029] refer to figure 1 , a multi-component joint reconstruction SAR echo broadband interference suppression method provided by the present invention includes the following steps:

[0030] Step 1, performing an adaptive window width short-time Fourier transform (STFT) on the original SAR echo signal to obtain a corresponding two-dimensional time-frequency map;

[0031] The Fourier transform is widely used in signal analysis and processing to reveal the characteristics of the signal in the frequency domain. However, the original Fourier transform performs the transform over the entire time of the signal, and time information is lost. As an extension of Fourier tran...

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Abstract

The invention belongs to the technical field of radar signal processing, and discloses an SAR echo broadband interference suppression method based on multi-component joint reconstruction. According to the method, a two-dimensional time-frequency diagram is constructed based on short-time Fourier transform of an adaptive window width, and is used for estimating instantaneous frequency; in addition, ridge path detection based on a Viterbi algorithm and a proposed re-detection method is designed, and instantaneous frequency estimation is carried out; and finally, the broadband interference suppression method based on multi-component joint reconstruction is provided for broadband interference suppression of a synthetic aperture radar. Broadband interference can be effectively suppressed, and a certain foundation is laid for obtaining synthetic aperture radar images in an interference environment.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a multi-component joint reconstruction method for suppressing broadband interference of SAR echoes, which is used for recovering synthetic aperture radar (Synthetic Aperture Radar, SAR) echoes, effectively suppressing broadband interference, and obtaining High quality SAR images. Background technique [0002] Synthetic aperture radar is widely used in national defense and military (battlefield reconnaissance and situational tracking, etc.), national economy (such as transportation, weather forecasting and resource detection, etc.) and scientific research (such as aerospace, atmospheric physics, etc.) and astronomical research, etc.) have been widely used. [0003] As the electromagnetic environment becomes more complex, electromagnetic interference inevitably destroys SAR echoes. These interferences can be called radio frequency interference, which reduces the s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36G01S13/90
CPCG01S7/36G01S13/9021
Inventor 周峰梅诗国韩文畅樊伟伟田甜石晓然
Owner XIDIAN UNIV
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