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NLCS imaging-based multi-channel two-pulse clutter cancellation method for double-base forward looking SAR

A dual-base forward-looking, multi-channel technology, applied in the radar field, can solve problems such as inaccurate clutter covariance matrix estimation, poor clutter suppression effect of STAP method, and limited application range of DPCA, etc., so as to improve the clutter suppression effect , reduce computational complexity, and expand the scope of application

Active Publication Date: 2019-08-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, due to the serious range non-stationarity of the bistatic forward-looking SAR, the estimation of the clutter covariance matrix is ​​inaccurate, and a large number of independent and identically distributed range samples are difficult to satisfy in practical situations.
As a result, the clutter suppression effect of the STAP method is not good
At the same time, because the radar transmitter and receiver are separated from different platforms, the traditional DPCA processing condition is difficult to meet, that is, after an appropriate time interval, the previous receiving phase center and the subsequent receiving phase center coincide
This limits the scope of application of DPCA

Method used

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  • NLCS imaging-based multi-channel two-pulse clutter cancellation method for double-base forward looking SAR
  • NLCS imaging-based multi-channel two-pulse clutter cancellation method for double-base forward looking SAR
  • NLCS imaging-based multi-channel two-pulse clutter cancellation method for double-base forward looking SAR

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Embodiment Construction

[0049] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0050] Such as figure 1 Shown is a schematic flow chart of the bibase forward-looking SAR multi-channel two-pulse clutter cancellation method based on NLCS imaging of the present invention; a bibase forward-looking SAR multi-channel two-pulse clutter cancellation method based on NLCS imaging, including The following steps:

[0051] S1. Establish the spatial geometric configuration of the bistatic forward-looking SAR, and initialize the system parameters;

[0052] S2. Record the echo within the radar observation time and demodulate it to the baseband, and then perform distance Fourier transform...

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Abstract

The invention discloses an NLCS imaging-based multi-channel two-pulse clutter cancellation method for double-base forward looking SAR. According to the method, the migration of a distance unit is firstly corrected by using keystone transform, and then the azimuth space change of an echo is removed through an NLCS algorithm, so that a clutter and a moving target are separated from each other in a two-dimensional space-time domain; and finally, a clutter canceler is designed to suppress the clutter according to clutter and echo characteristics, thereby improving the signal-to-noise ratio of theecho, and then laying a foundation for improving the subsequent moving target detection.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a bistatic forward-looking SAR multi-channel two-pulse clutter cancellation method based on NLCS (nonlinear chirp scaling, nonlinear CS algorithm) imaging. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-weather modern high-resolution microwave remote sensing imaging radar, which uses the relative motion between the radar antenna and the target area to obtain high spatial resolution. Synthetic aperture radar has played an increasingly important role in the fields of terrain surveying and mapping, vegetation analysis, ocean and hydrological observation, environment and disaster monitoring, resource exploration, and detection of small changes in the earth's crust. [0003] Bistatic forward-looking SAR is a new radar system. By using the separation of transceivers to overcome the problem of forward-looking imaging blind spots in single-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41G01S13/50
CPCG01S7/41G01S7/414G01S7/415G01S13/50G01S13/9011G01S13/9043G01S13/9058
Inventor 李中余李山川刘竹天黄川杨海光武俊杰杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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