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SAR motion target detection method based on Doppler spectral analyses

A technology of Doppler spectrum and moving targets, which is applied in measuring devices, radio wave measuring systems, radio wave reflection/re-radiation, etc. It can solve the problems that the detection probability cannot reach the maximum and target missed detection, etc.

Inactive Publication Date: 2015-07-08
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

However, under the condition that the constant false alarm rate is determined, the detection probability of this method cannot reach the maximum, that is, the target is more likely to be missed.

Method used

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  • SAR motion target detection method based on Doppler spectral analyses
  • SAR motion target detection method based on Doppler spectral analyses
  • SAR motion target detection method based on Doppler spectral analyses

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Embodiment 1

[0065] Such as figure 1 As shown, the SAR moving target detection method based on Doppler spectrum analysis is used to detect ground moving targets in a SAR image. The SAR image selected in this embodiment is a set of field data, the scene is an airport in Shaanxi, and its grayscale image is as follows Figure 4 shown. The size of the image is 4096*4096. There are two motor vehicles moving in the scene. Their speed has a larger component along the azimuth direction and a smaller component along the distance direction. Figure 4 are marked as T 1 and T 2 . The image is processed according to the technical solution of the present invention, specifically comprising the following steps:

[0066] Step S1, take a rectangular neighborhood for the scattering points on the SAR image, the length of the rectangular neighborhood is 65 pixels along the azimuth direction, and the length of the rectangular neighborhood is 33 pixels along the distance direction.

[0067] Step S2, perfo...

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Abstract

The invention provides an SAR motion target detection method based on Doppler spectral analyses. The SAR motion target detection method based on Doppler spectral analyses is used for detecting ground motion targets in an SAR picture, and mainly solves the problem that an existing detection method is not high in detection probability so as to improve detection probability. According to the method, rectangular neighborhoods of scattering points in the SAR picture are chosen, clutter lock is conducted on Doppler frequency spectrums in each neighborhood to acquire Doppler center frequency, and then standard deviations of frequency spectrums after clutter lock are calculated to represent Doppler bandwidths. Traversal is conducted on all scattering points in the SAR picture, the scattering points are processed in the same way, statistics is then carried out, a measure is constructed through obtained statistics to ensure that the detection boundary of the measure is an oval, and a detection threshold is determined according to constant false alarm rate (CFAR). Because the detection boundary is an oval, on the premise that the constant false alarm rates are the same, oval detection boundary detection probability is larger than rectangle detection boundary detection probability, and target missing detection does not occur easily.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar (SAR), and in particular relates to a SAR moving target detection method based on Doppler spectrum analysis. Background technique [0002] Ground moving target detection (GMTI) of synthetic aperture radar (SAR, Synthetic Aperture Radar) images is widely used in military and civilian neighborhoods, including detection methods using multi-antenna SAR and detection methods using single-antenna SAR. Detection methods using multi-antenna SAR, such as offset phase center antenna (DPCA) method, space-time adaptive filtering (STAP) and other technologies, use multiple antennas or antenna arrays to eliminate ground clutter signals, thereby detecting moving targets; There is also the along-track interferometry (ATI) method, which uses multiple antennas to generate multiple SAR images, and detects the phase difference between these images to detect moving targets. Due to the complex structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 詹天仪王军锋
Owner SHANGHAI JIAOTONG UNIV
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