SAR echo rapid time domain generation method

An echo and time domain technology, applied in the field of radar, which can solve the problems of inaccurate echoes

Active Publication Date: 2016-09-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the frequency-domain echo generation methods are all based on the azimuth-space invariant assumption, and can only be applied to the sin...

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Embodiment Construction

[0081] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.

[0082] The present invention mainly adopts the mode of simulation experiment to verify, and the simulation verification platform is Matlab2014. The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0083] Such as figure 1 As shown, the technical solution of the present invention is: a kind of SAR echo fast time-domain generation method, and concrete process is as follows:

[0084] S1: Imaging system parameter initialization, including: the initial position coordinates of the SAR platform are marked as (x R ,y R , h R ), where x R 、y R and h R are the x-axis, y-axis and z-axis coordinates of the platform; the velocity of the SAR platform is recorded as V; th...

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Abstract

The invention discloses an SAR echo rapid time domain generation method. All point targets included by a surface target are merged stage by stage, each merged group of point targets at each stage are replaced with one virtual point target, first-stage echoes are generated by use of a time domain superposition method, as the point targets are merged stage by stage, sub echoes generated at each stage gradually become dense, finally, when the number of sampling points in an echo data orientation becomes the same as the number of orientation sampling points, merging ends, and complete echoes are obtained by superposing sub echoes of the last stage. Compared to a conventional time domain superposition method, the method provided by the invention has the following advantages: the orientation sampling points and the point targets do not have to be traversed one by one, the calculation redundancy generated by the echoes is reduced, the computation amount is greatly reduced, the method is applied to an SAR system of any mode and is especially applied to echo generation of a large-scene surface target, and at the same time, platform motion errors are easily introduced.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to an echo time-domain generating method in the SAR imaging technology. Background technique [0002] SAR is an all-day, all-weather modern high-resolution microwave remote sensing imaging radar. It uses the relative motion between the radar antenna and the target area to obtain high resolution in the range direction, and uses pulse compression to obtain high resolution in the range direction. In the fields of military reconnaissance, terrain surveying and mapping, vegetation analysis, ocean and hydrological observation, environment and disaster monitoring, synthetic aperture radar has played an increasingly important role. [0003] SAR echo generation technology refers to reproducing the working process of synthetic aperture radar by establishing a model and using computer simulation to obtain simulated echo data. Because SAR data processing and imaging processing equipm...

Claims

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Application Information

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IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/4052G01S13/90
Inventor 武俊杰王悦张强辉裴季方冀彦杰缪羽轩黄钰林杨建宇杨海光杨晓波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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