Double-threshold constant false alurm motion target detecting method of double base synthetic aperture radar

A technology for synthetic aperture radar and moving targets, which is applied in measuring devices, radio wave measurement systems, radio wave reflection/re-radiation, etc., and can solve problems such as signal-to-noise ratio degradation, detection performance deterioration, and fast-moving target failure

Inactive Publication Date: 2007-07-18
TSINGHUA UNIV
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Problems solved by technology

Unfortunately, this method is based on the phase analysis of the azimuth signal in the long coherent processing time, so it is required that the moving target cannot span multiple range units in the processing time, which makes these methods

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  • Double-threshold constant false alurm motion target detecting method of double base synthetic aperture radar
  • Double-threshold constant false alurm motion target detecting method of double base synthetic aperture radar
  • Double-threshold constant false alurm motion target detecting method of double base synthetic aperture radar

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Embodiment Construction

[0041] First, a model of the problem is given. Figure 1 shows a schematic diagram of a side-looking co-orbit bistatic SAR. The X axis represents the azimuth direction, the Y axis represents the distance direction, and the Z axis represents the vertical direction. The radar transmitter Tr and the receiver Re move along the X-axis at the same speed v. In the X-Y plane, there is a target P in the detection time interval [-T / 2, T / 2] at a constant speed (v x , v y )sports. When azimuth time t=0, the transmitter is located at (0, y Tr , H t ), the receiver is located at (0, 0, H r ), P is located at (x 0 , y 0 ). According to the geometric relationship, it can be known that the instantaneous distance functions of the target P and the transmitter and receiver are respectively:

[0042] R T ( t ) = [ x ...

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Abstract

A detection method of double-threshold constant false alarm movement object on double-base synthetic aperture radar includes finalizing distance compression of various pulse-sampling, dividing orientation time to be multiple CPI, carrying out FFT in each CPI to enter orientation frequency domain, comparing data amplitude of frequency channel at external of clutter region with the first threshold and outputting point trace, making coagulation on point trace, making Hough transform in point trace domain and making decision of the second threshold.

Description

technical field [0001] The invention relates to a double-threshold constant false alarm moving target detection method for bistatic synthetic aperture radar. Background technique [0002] Synthetic Aperture Radar (SAR) has excellent characteristics such as all-weather, all-weather, and penetrability. It is widely used in civil and military fields such as navigation, remote sensing, mapping, reconnaissance, warning, and fire control. In recent years, with the continuous development of technology and the increasing demand, the detection of moving targets from SAR echo signals has become a research hotspot in the field of multi-modal SAR, a new system at home and abroad. At the same time, bistatic SAR is also getting more and more attention. Compared with monostatic radar, bistatic SAR has better "four-antibody" performance. ONERA / DLR and FGAN successfully completed the same-speed parallel-orbit airborne bistatic SAR imaging experiments on stationary scenes in February and Oct...

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Application Information

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IPC IPC(8): G01S13/90G01S7/292G01S7/32
Inventor 李刚彭应宁许稼王秀坛戴喜增
Owner TSINGHUA UNIV
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