Space-based early warning radar air moving target detection method and system based on sub-aperture processing

A moving target detection and early warning radar technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of large target echo distance, unfavorable space-based early warning radar detection of weak air moving targets, and small cumulative gain, etc., to overcome Insufficient output SCNR, improve detection ability, improve the effect of output SCNR

Active Publication Date: 2022-04-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the background of space-based radar AMTI, due to the large distance of the target echo, there are few direct coherent accumulation pulses in the segment, and the accumulation gain is small, which is not conducive to the detection of weak air-moving targets by space-based early warning radar.

Method used

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  • Space-based early warning radar air moving target detection method and system based on sub-aperture processing
  • Space-based early warning radar air moving target detection method and system based on sub-aperture processing
  • Space-based early warning radar air moving target detection method and system based on sub-aperture processing

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Embodiment 1

[0072] According to a kind of space-based early warning radar aerial moving target detection method based on sub-aperture processing provided by the present invention, comprising:

[0073] Step S1: Preprocessing the multi-channel echo of the space-based early warning radar to obtain the preprocessed radar echo data;

[0074] Step S2: Perform Keystone transformation on the preprocessed radar echo data to complete distance walking correction;

[0075] Step S3: Divide the echo data corrected by the range walk along the azimuth sub-apertures, the division is based on the fact that no Doppler frequency walk occurs in each sub-aperture, so as to ensure that Doppler spread does not occur in the sub-apertures;

[0076] Step S4: Use post-Doppler space-time adaptive processing technology (STAP) in each sub-aperture to complete clutter suppression, complete the initial accumulation of coherence in each sub-aperture, and then pass the low-threshold constant false alarm (CFAR) Detect and ...

Embodiment 2

[0121] Embodiment 2 is a preferred example of embodiment 1

[0122] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0123] A space-based early warning AMTI method based on sub-aperture coherent accumulation provided by the present invention specifically includes the following steps: figure 1 , image 3 Shown:

[0124] Step 1: Establish a spaceborne multi-channel observation model, and complete preprocessing such as distance compression, platform parameter phase compensation, and frequency down-regulation.

[0125] specific reference figure 2 , in the three-dimensional coordinates O-XYZ, the height of the satellite platform is H, the ...

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Abstract

The invention provides a space-based early warning radar air moving target detection method and system based on sub-aperture processing, comprising: preprocessing the multi-channel echo of the space-based early warning radar to obtain preprocessed radar echo data; The processed radar echo data is subjected to Keystone transformation to complete the distance walking correction; the echo data after the distance walking correction is divided along the azimuth sub-apertures to ensure that Doppler diffusion does not occur in the sub-apertures; in each sub-aperture, use Post-Doppler space-time adaptive processing technology completes clutter suppression, completes preliminary accumulation in each sub-aperture, and then extracts targets to be detected through low-threshold constant false alarm detection; After compensation, Fourier transform is performed along the sub-aperture direction to realize coherent accumulation between sub-apertures and further improve the output signal-to-noise ratio of the target signal. Finally, false alarms are eliminated and real target points are retained through high-threshold detection.

Description

technical field [0001] The present invention relates to the field of radar signal processing, in particular, to a space-based early warning radar aerial moving target detection method and system based on sub-aperture processing, and more specifically, to a sub-aperture coherent accumulation transformation (SCA)-based space-based Early warning radar AMTI method. Background technique [0002] Space-based early warning radar has the advantages of continuous global coverage, strong anti-stealth capability, and high security, and plays a very important role in national defense construction. With the rapid development of aerospace technology, advanced aerial targets often exhibit small radar cross-section (RCS), high speed, and high maneuverability, resulting in weak echo signal energy; in addition, due to the high-speed movement of the spaceborne platform, the observed The moving targets are usually submerged in the extended ground / ocean clutter background, making target detecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/411G01S7/418
Inventor 占木杨黄鹏辉陈江源刘兴钊陆晴林欣孙永岩万向成刘艳阳陈国忠陈筠力
Owner SHANGHAI JIAO TONG UNIV
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