Radar angle super-resolution imaging method based on deconvolution
A technology of super-resolution imaging and radar angle, which is used in the reflection/re-radiation of radio waves, the use of re-radiation, measurement devices, etc., and can solve the problems of target amplitude information distortion, position offset, and inability to use angular resolution.
Active Publication Date: 2016-06-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Since the phase information of the signal does not need to be considered in optical imaging, if the convolution inversion method in optics is directly applied to microwave imaging, the phase information of the signal in microwave imaging will not be used, resulting in low angular resolution, distortion of target amplitude information, and Position offset, appearance of false targets, etc.
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[0069] The present invention uses simulation experiments to demonstrate the feasibility and effectiveness of the proposed radar angle super-resolution method, and all steps and conclusions are verified to be correct on the Matlab2012 simulation platform. The method of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0070] The schematic flow chart of scanning radar angle super-resolution imaging in the present invention is as follows figure 1 As shown, the specific process is as follows:
[0071] Step 1: Radar echo modeling,
[0072] This implementation is aimed at figure 2 The radar imaging geometric mode shown involves the following relevant parameters: radar platform height H, flight speed V along the positive direction of the X-axis, radar antenna scanning angular velocity ω along the Y-axis direction, radar antenna beam pitch angle θ, and the carrier frequency of the transmitted signal f c...
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The invention discloses a radar angle super-resolution imaging method based on deconvolution, which converts the radar angle super-resolution imaging into a convolution inversion problem in the complex domain, and changes the inherent nature of the convolution inversion problem by adding constraints. ill-conditioned; at the same time, transform the convolution inversion problem into the realization of the optimal solution of the corresponding constrained objective function on the complex field; then use the vector on the real field to represent the complex variable, and optimize the constrained objective function on the complex field The solution problem is transformed into the realization of the optimal solution of the unconstrained objective function in the real number field; finally, the Lagrange multiplier method is used to realize the optimal solution of the unconstrained objective function in the real number field, and the scanning radar angle super-resolution imaging is realized. The method of the invention can break through the limitation of the antenna system parameters on the radar image resolution, and realize the radar angle super-resolution imaging; the imaging result has a good effect on maintaining the target range, number and position information.
Description
technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a radar angle super-resolution imaging method based on deconvolution. Background technique [0002] As an important tool in the field of microwave imaging, radar has all-weather and all-weather working capabilities, and has been widely used in marine search and rescue, topographic mapping, geological disaster rescue and other fields. The traditional synthetic aperture radar (SAR) can realize two-dimensional high-resolution imaging in the side-view and oblique front-view areas, but it cannot realize the front-view area imaging of the radar platform. This is because the equidistance lines and iso-Doppler lines in the area of frontal vision are parallel. In order to realize radar forward-looking area imaging, radar forward-looking beam scanning can be used. Scanning radar means that the radar beam scans the detected area uniformly or non-uniformly in azimuth. Thr...
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IPC IPC(8): G01S13/89
CPCG01S7/285G01S13/89
Inventor 黄钰林查月波蒲巍武俊杰杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA