Multi-channel uniformly-accelerated trajectory SAR moving target two-dimensional speed estimation method

A multi-channel, moving target technology, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc.

Active Publication Date: 2019-12-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

However, due to the existence of acceleration, there may be complex motion trajectories, which brings great challenges to moving target detection, imaging, and motion parameter estimation. For details, see the reference "Deng, B, Li, X, Wang, H, Qin, Y , Wang, J, Fast Raw-Signal Simulation of Extended Scenes for Missile-Borne SAR With Constant Acceleration, IEEE Geoscience and Remote Sensing Letters 2011, 8, 44–48, doi:10.1109 / LGRS.2010.2050675”

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  • Multi-channel uniformly-accelerated trajectory SAR moving target two-dimensional speed estimation method

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Embodiment Construction

[0077] The present invention can be verified by means of computer simulation experiments, and all steps and conclusions are verified on MATLAB-2017b. The specific implementation steps are as follows:

[0078] Step 1. Initialize the system parameters of the multi-channel SAR:

[0079] The initial multi-channel SAR system parameters include: the propagation speed of electromagnetic waves in the air, denoted as C=3×10 8 m / s; radar carrier wavelength, denoted as λ=0.03m; radar antenna transmitting signal bandwidth, denoted as B=150MHz; radar transmitting pulse width, denoted as T r = 1μs; radar sampling frequency, denoted as F s = 210MHz; radar pulse repetition frequency, denoted as PRF = 3000Hz; number of sampling points in the range direction of the radar system, denoted as N r =4096; Radar system azimuth sampling points, denoted as N a =10240; the time when the distance is fast, denoted as t, t=1,2,...,N r ; Azimuth slow time, denoted as η, η=1,2,...,N a ; Radar platform ...

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Abstract

The invention discloses a multi-channel uniformly-accelerated trajectory SAR moving target two-dimensional speed estimation method. The method comprises the following steps: performing multi-channel uniformly-accelerated motion trajectory SAR moving target detection and two-dimensional speed estimation by combining a VSR technology with a time domain backward projection algorithm (BP); firstly imaging multi-channel echo data by utilizing the BP algorithm, and then inhibiting static clutter and estimating the distance speed of the moving target by using the VSAR technology, and then imaging a sub-region through the BP method by using the estimated distance speed and the searched target location range; and inhibiting the clutter of the sub-image by utilizing the VSAR technology, and finallyacquiring an azimuth speed of the moving target by adopting the minimum image entropy method. The invention provides a new moving target detection and two-dimensional speed estimation method for a mobile trajectory platform, the clutter can be effectively inhibited, the location of the moving target and the two-dimensional speed of the moving target can be precisely estimated.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a multi-channel uniform acceleration trajectory synthetic aperture radar moving target indication (Synthetic Aperture Radar Ground Moving Target Indication, SAR-GMTI) method. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-time, all-weather, and information-rich remote sensing imaging technology. SAR imaging technology can obtain clear images of the static scene on the ground, but when there is a moving target on the ground, due to the influence of the moving target's motion, directly using the matched filter method relative to the static scene to image the moving target will cause the moving target to shift and scatter. The consequences of defocusing make it difficult for moving targets to be detected in static clutter. However, there are usually a large number of moving targets in the military that need to be detected in order...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/58G01S13/90G01S7/41G01S7/02
CPCG01S13/589G01S13/9029G01S7/415G01S7/023G01S13/9017
Inventor 张晓玲唐欣欣张星月明婧师君韦顺军
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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