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

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

Inactive Publication Date: 2009-03-18
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 pair
  • Single-channel synthetic aperture radar moving-target detection method based on multi-apparent subimage pair
  • Single-channel synthetic aperture radar moving-target detection method based on multi-apparent subimage pair

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Embodiment Construction

[0095] The method of the present invention can be divided into 10 steps, and concrete process is as attached Figure 9 Shown:

[0096] (1) The radar platform transmits the chirp signal, receives the echo from the observed scene, and obtains the original SAR data through high-speed AD sampling;

[0097] (2) Perform range-wise pulse compression on the SAR raw data to complete the range-wise processing;

[0098] (3) Perform Fast Fourier Transform (FFT) along the azimuth direction;

[0099] (4) Perform range migration correction in the azimuth frequency domain;

[0100] (5) Azimuth spectrum division to get S R1 , S L1 , S R2 , S L2 ......S RN , S LN Etc. 2N sub-apertures;

[0101] (6) Carry out multi-view imaging to each sub-aperture, get I R1 , I L1 , I R2 , I L2 ......I RN , I LN Wait for 2N sub-views to be imaged, and follow the attached figure 1 The method shown composes N sub-image pairs;

[0102] (7) The sub-view images of each sub-image pair cancel each oth...

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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 (SAR, hereinafter referred to as SAR) is an all-weather, all-time, high-resolution radar, which performs pulse compression and azimuth echo signal coherence on the chirp signal with a large time-bandwidth product through the distance upward Accumulate two-dimensional high-resolution images. [0003] When the radar platform at the flight height H flies along a straight line, it emits beams towards the positive side of the flight direction, as shown in the attached figure 1 As shown, 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. Define the flying direction of the radar platform as the azimuth direction, and the direction perpendicular to it is the distance direction. Connect the radar antenna to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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