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Multi-channel UWB SAR moving target two-dimensional speed rapid estimation method

A moving target, multi-channel technology, applied in the field of two-dimensional fast speed estimation of multi-channel UWBSAR moving targets, can solve the problems of SARDPCA/ATI target detection and parameter estimation performance degradation, and achieve the effect of fast processing

Pending Publication Date: 2021-06-11
北京理工大学重庆创新中心 +1
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Problems solved by technology

The traditional SAR DPCA / ATI multi-channel moving target detection and parameter estimation algorithm, considering the short aperture time, the moving target remains in a range-azimuth resolution unit after SAR processing, but in the face of defocusing with a decreased signal-to-noise ratio Target, SAR DPCA / ATI target detection and parameter estimation performance degradation

Method used

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  • Multi-channel UWB SAR moving target two-dimensional speed rapid estimation method
  • Multi-channel UWB SAR moving target two-dimensional speed rapid estimation method
  • Multi-channel UWB SAR moving target two-dimensional speed rapid estimation method

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Embodiment 1

[0049] In order to solve the problem that the current focusing detection and parameter estimation of moving targets requires a large amount of calculation and it is difficult to realize real-time processing, this embodiment provides a method for quickly estimating the two-dimensional velocity of a multi-channel UWB SAR moving target. Please refer to figure 1 , mainly including the following steps:

[0050] Step 1: For the multi-channel UWB SAR echo data, use the keystone transform to correct the range bending, and then use the symmetric autocorrelation function based on the range frequency domain, chirp-z transform and IFFT to complete the energy accumulation of each moving target and realize Moving target detection and azimuth signal extraction.

[0051] In this embodiment, the multi-channel UWB SAR system parameters are shown in Table 1 below:

[0052] Table 1: UWB SAR system parameters

[0053] parameter value parameter value working frequency 400MH...

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Abstract

The invention provides a multi-channel UWB SAR moving target two-dimensional speed rapid estimation method, and the method comprises the steps: carrying out the range-direction symmetric autocorrelation function processing of data of each channel, eliminating the coupling between a range frequency domain and slow time through keystone transformation and chirp z transformation according to the characteristics of a deduced UWB SAR moving target signal model, achieving the coherent accumulation of target energy, and estimating each target range migration parameter according to the peak position; and then, in order to adapt to azimuth signals after UWB SAR long-aperture time and range migration correction, adopting NUCPF processing and multi-channel interference processing of fourth-order phase signals, and solving the relative movement speed and the radial speed of a target together. According to the scheme, under the condition that parameter search is not carried out, target energy accumulation and motion parameter estimation under long aperture time are achieved, and rapid processing of data is completed.

Description

technical field [0001] The invention relates to the technical field of synthetic radar signal processing, in particular to a method for quickly estimating the two-dimensional velocity of a multi-channel UWB SAR moving target. Background technique [0002] Low-frequency ultra-wideband synthetic aperture radar (UWB SAR) has a strong "see-through" ability, and can penetrate leaves to detect targets hidden in the woods. It plays an irreplaceable role in moving target detection. [0003] Based on the UWB SAR moving target detection and parameter estimation method, the SAR imaging algorithm is combined with the moving target detection, and the transfer function of the SAR imaging algorithm that can make the UWB SAR moving target fully focused is given. The transfer function is related to the target position and speed. , by searching discretized position and velocity parameters one by one, the output signal energy is maximized, and the focus detection and parameter estimation of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S13/58G01S7/41
CPCG01S13/90G01S13/9094G01S13/58G01S7/418G01S7/023G01S13/0209
Inventor 崔畅董锡超向寅胡程张成祥
Owner 北京理工大学重庆创新中心
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