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Moving-target parameter estimation method of common-rail bistatic synthetic aperture radar (SAR)

A technology of parameter estimation and moving target, which is applied in the field of radar, can solve the problem of not considering the parameter estimation of moving target, unable to image and track the moving target, and realize the estimation of moving target parameters and eliminate the ambiguity of Doppler center frequency. Effect

Active Publication Date: 2015-04-08
XIDIAN UNIV
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Problems solved by technology

Li Zhenfang, Bao Zheng, and Wang Tong proposed the space-time adaptive processing of the space-time spectrum of the moving target in the paper "Distributed small satellite SAR system ground moving target detection method" "Acta Electronics" 2005, 33(9): 1664-1666 It is taken from the space-time plane to realize moving target detection, but this method requires that the number of channels along the course must be greater than the Doppler ambiguity number, and this method is limited to moving target detection, without considering the parameter estimation of moving targets, and cannot carry out follow-up Moving target imaging and target tracking

Method used

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  • Moving-target parameter estimation method of common-rail bistatic synthetic aperture radar (SAR)
  • Moving-target parameter estimation method of common-rail bistatic synthetic aperture radar (SAR)
  • Moving-target parameter estimation method of common-rail bistatic synthetic aperture radar (SAR)

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Embodiment Construction

[0030] refer to figure 1 , the implementation steps of the present invention are as follows:

[0031] Step 1: Perform range compression on the radar echo signals of bistatic SAR with different channels.

[0032] First construct a chirp signal whose frequency is opposite to that of the transmitted signal as a reference signal, and then transform the bistatic SAR radar echo signals of different channels and the reference signal into the frequency domain through Fourier transform, and then transform the echo signals in the frequency domain The wave signal is multiplied by the reference signal, and finally the multiplied result is transformed back to the time domain by inverse Fourier transform to complete the distance compression.

[0033] Step 2: Utilize the phase center offset method DPCA to carry out clutter cancellation to the signal after distance compression, and obtain the sparse moving target signal, and its form is:

[0034] s ( ...

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Abstract

The invention discloses a moving-target parameter estimation method of common-rail bistatic synthetic aperture radar (SAR). The method mainly aims at resolving the problem that moving-target parameter estimation under the Doppler ambiguity condition cannot be achieved in the prior art. The method includes the following steps: (1) carrying out distance compression on radar echo signals of bistatic SAR of different channels; (2) carrying out clutter cancellation on the distance-compressed signals with the data processing control area (DPCA) method, and obtaining sparse moving-target signals; (3) carrying out radon transformation on the sparse moving-target signals, and obtaining a moving-target vertical heading speed and distance position coordinates; (4) carrying out range cell migration correction by means of the moving-target vertical heading speed, meanwhile compensating for the linear phase caused by the range cell migration correction, and eliminating Doppler center frequency ambiguity; and (5) utilizing the optimization method based on the compressed sensing theory to acquire the moving-target heading speed and the position. According to the moving-target parameter estimation method, moving-target parameter estimation of a bistatic SAR system under the low pulse repetition frequency (PRF) condition can be achieved. The method can be used for moving-target imaging and target tracking.

Description

Technical field: [0001] The invention belongs to the field of radar technology, and relates to a method for estimating moving target parameters of co-orbital bistatic synthetic aperture radar SAR, which can be used as the basis for further moving target imaging and target tracking. Background technique: [0002] Different from monostatic SAR, bistatic SAR can obtain more angle information, and has stronger concealment performance and anti-strike performance. The moving target parameter estimation of bistatic SAR has broad applications in military applications, resource investigation, and crustal deformation monitoring. application prospects. [0003] Bistatic SAR uses a low pulse repetition frequency (PRF) to obtain a wide swath without range ambiguity, while low PRF can cause Doppler spectrum ambiguity. At present, the existing technologies use methods such as zero point control, spatial filtering and multi-channel signal recovery to complete the deblurring process, but th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
Inventor 邢孟道陈士超保铮周松
Owner XIDIAN UNIV
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