A Multi-Channel Uniformly Accelerated SAR Moving Target 2D Velocity Estimation Method

A multi-channel, moving target technology, applied to instruments, measuring devices, using re-radiation, etc., to achieve the effect of suppressing clutter

Active Publication Date: 2022-06-03
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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  • A Multi-Channel Uniformly Accelerated SAR Moving Target 2D Velocity Estimation Method
  • A Multi-Channel Uniformly Accelerated SAR Moving Target 2D Velocity Estimation Method

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Embodiment Construction

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

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

[0079] The parameters of the initialized multi-channel SAR system 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 transmit signal bandwidth, denoted as B=150MHz; radar transmit pulse time width, denoted as T r =1μs; radar sampling frequency, denoted as F s = 210MHz; radar pulse repetition frequency, denoted as PRF = 3000Hz; radar system range sampling points, denoted as N r = 4096; the number of sampling points in the azimuth direction of the radar system, 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,.....

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Abstract

The invention discloses a multi-channel uniform acceleration trajectory SAR moving target detection and two-dimensional velocity estimation method. The method combines VSAR technology with a time domain back projection algorithm (BP) and is used for multi-channel uniform acceleration trajectory SAR moving targets. Detection and 2D Velocity Estimation. First use the BP algorithm to image the multi-channel echo data, then use the VSAR technology to suppress the static clutter and estimate the range velocity of the moving target, and then use the estimated range velocity and the searched target position range to conduct the sub-scale again through the BP method In the imaging of the area, the VSAR technology is used to suppress the clutter of the sub-image, and finally the minimum image entropy method is used to obtain the azimuth and velocity of the moving target. The invention provides a new moving target detection and two-dimensional speed estimation method for the mobile trajectory platform, which can effectively suppress clutter and accurately estimate the position of the moving target and the two-dimensional speed of the moving target.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and particularly relates to a multi-channel uniform acceleration trajectory synthetic aperture radar moving target indication (SyntheticAperture Radar GroundMovingTargetIndication, SAR-GMTI) method. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-weather, and information-rich remote sensing imaging technology. SAR imaging technology can obtain clear images of stationary scenes on the ground, but when there is a moving target on the ground, due to the influence of the motion of the moving target, directly imaging the moving target with the matched filtering method relative to the stationary scene will cause the moving target offset and dispersion. As a result of the focus, moving targets are difficult to detect in stationary clutter. However, there are usually a large number of moving targets in the military that need to be detected for timely c...

Claims

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Application Information

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Patent Type & Authority Patents(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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