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Single-channel synthetic aperture radar moving-target detection method based on multi-apparent subimage paire

A technology for synthetic aperture radar and moving target detection, which is used in measurement devices, radio wave measurement systems, and radio wave reflection/re-radiation. It can solve problems such as accumulation, lack of versatility, and inability to effectively suppress coherent noise.

Inactive Publication Date: 2006-09-13
TSINGHUA UNIV
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Problems solved by technology

The algorithm proposed in this paper cannot effectively suppress coherent noise, and does not accumulate the energy of moving targets. At the same time, the signal energy is lost in filtering. Therefore, it can only detect moving targets with high SNR. At the same time, the algorithm needs to be based on different Scene design filter, not universal

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  • Single-channel synthetic aperture radar moving-target detection method based on multi-apparent subimage paire
  • Single-channel synthetic aperture radar moving-target detection method based on multi-apparent subimage paire
  • Single-channel synthetic aperture radar moving-target detection method based on multi-apparent subimage paire

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Embodiment Construction

[0096] The method of the present invention can be divided into 10 steps, and the specific process is as attached Figure 9 shown:

[0097] (1) The radar platform transmits chirp signals, receives echoes from the observed scene, and obtains SAR raw data through high-speed AD sampling;

[0098] (2) Perform range pulse compression on the SAR raw data to complete range processing;

[0099] (3) Do fast Fourier transform (FFT) along the azimuth direction;

[0100] (4) Perform range migration correction in the azimuth frequency domain;

[0101] (5) The azimuthal spectrum is divided to obtain S R1 , S L1 , S R2 , S L2 ...S RN , S LN Equal 2N sub-apertures;

[0102] (6) Multi-view imaging is performed on each sub-aperture to obtain I R1 , I L1 , I R2 , I L2 ...I RN , I LN Wait for 2N subviews to be imaged, follow the appendix figure 1 The shown method forms N sub-image pairs;

[0103] (7) The sub-view images of each sub-image pair cancel each other to obtain N cancella...

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Abstract

A method for detecting radar mobile object of single channel synthetic hole diameter based on multivision sub image pair includes forming multiple symmetric sub image pairs by multivision image of synthetic hole diameter radar data, forming each sub image pair by two subvision images, utilizing subvision image cancellation to accumulate cancellation result by two - dimensional united means along position and distance directions for effectively suppressing background clutter interference as well as for realizing energy accumulation of mobile object then applying constant false alarm technique to finalize detection on mobile object.

Description

technical field [0001] The invention relates to a single-channel synthetic aperture radar moving target detection method of a radar system. Background technique [0002] Synthetic Aperture Radar (Synthetic Aperture Radar, hereinafter referred to as SAR) is an all-weather, all-weather, high-resolution radar that performs pulse compression and azimuth echo signal coherence on the chirp signal with a large time bandwidth product through the distance upward. Accumulate to obtain two-dimensional high-resolution images. [0003] When the radar platform with flight height H is flying in a straight line, the beam is emitted towards the positive side of the flight direction, as shown in the appendix figure 1 As shown in the figure, the main lobe of the beam covers a certain area on the ground. With the movement of the platform, a surveying strip will be formed. The direction of flight of the radar platform is defined as the azimuth direction, and the direction perpendicular to it is...

Claims

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Application Information

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IPC IPC(8): G01S13/90
Inventor 张卫杰彭应宁王秀坛汤俊于明成
Owner TSINGHUA UNIV
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