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Method for detecting single channel synthetic aperture radar (SAR) ground motion target

A technology for detecting ground moving targets and moving targets, which is applied in measuring devices, radio wave measurement systems, radio wave reflection/re-radiation, etc. Unsatisfactory problems, such as achieving good moving target detection results, inhibiting the detection of slow moving targets on the ground, and reducing the probability of false alarms

Inactive Publication Date: 2012-08-22
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

The conventional single-channel SAR ground moving target detection method based on two-view processing is very sensitive to sub-view image registration errors and direction map asymmetry errors, and the clutter suppression ability is limited. The moving target detection results have a high false alarm probability and a low detection probability. The effect is very unsatisfactory in practical engineering

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  • Method for detecting single channel synthetic aperture radar (SAR) ground motion target
  • Method for detecting single channel synthetic aperture radar (SAR) ground motion target
  • Method for detecting single channel synthetic aperture radar (SAR) ground motion target

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0018] It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. And in the accompanying drawings, it is marked for simplicity or convenience. Furthermore, implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints.

[0019] The method of the present invention is based on the...

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Abstract

The invention discloses a method for detecting a single channel synthetic aperture radar (SAR) ground motion target, which includes conducting clutter locking estimation on original echo data to obtain clutter Doppler center frequency, converting the original echo data into direction spectrum, dividing the direction spectrum into positive frequency spectrum and negative frequency spectrum with the clutter Doppler center frequency as a boundary, obtaining a first auxiliary look complex image and a second auxiliary look complex image respectively through the positive frequency spectrum and the negative frequency spectrum, conducting direction rectification on the first auxiliary look complex image and the second auxiliary look complex image, obtaining a first auxiliary look amplitude image and a second auxiliary look amplitude image through the first auxiliary look complex image and the second auxiliary look complex image which receives the direction rectification, conducting amplitude comparison on corresponding pixels of the first auxiliary look amplitude image and the second auxiliary look amplitude image. The pixel position corresponds to a movable target if the amplitude ratio is larger than the set detection threshold, otherwise, the pixel position corresponds to the clutter background, so that the movable target detection result can be obtained. The method can effectively restrain clutter and detect ground low speed motion targets.

Description

technical field [0001] The invention relates to the technical field of radar technology airborne synthetic aperture radar (Synthetic Aperture Radar, referred to as SAR), in particular to a single-channel SAR ground moving target detection method based on two-view processing. Background technique [0002] The frequency domain filtering method is a more practical method in the single-channel SAR Ground Moving Target Indication (GMTI) method. The frequency domain filtering method is based on the deviation of the Doppler center frequency of the moving target from the clutter Doppler center frequency to realize the moving target detection. Since the frequency domain filtering method detects moving targets by constructing a filter to filter out clutter while retaining the moving target information, and the frequency spectrum of slow moving targets is often submerged in the clutter spectrum, it cannot be detected using the frequency domain filtering method Slow motion target. [...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
Inventor 行坤邓云凯赵凤军倪江王宇祁海明
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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