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A Fast Time Domain Generation Method of SAR Echo

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

Active Publication Date: 2018-04-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 single-base SAR mode and the shift-invariant bistatic SAR mode of uniform linear motion. Echoes simulated by bit frequency domain analysis are inaccurate

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  • A Fast Time Domain Generation Method of SAR Echo
  • A Fast Time Domain Generation Method of SAR Echo
  • A Fast Time Domain Generation Method of SAR Echo

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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] like 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; the f...

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Abstract

The invention discloses a SAR echo fast time-domain generation method. By merging all point targets included in the area target step by step, each group of point targets combined is replaced by a virtual point target at each level, and time-domain superposition is used. The method generates the first level of echoes. As the point targets are merged step by step, the sub-echoes generated by each level gradually become finer and denser. Finally, when the number of echo data azimuth sampling points reaches the same number as the number of azimuth sampling points, the combination is terminated. , superimposing the last level of sub-echoes to obtain a complete echo. Compared with the existing time-domain superposition method, the method of the present invention does not need to traverse azimuth-by-azimuth sampling points and point-by-point targets, reduces the calculation redundancy of echo generation, greatly reduces the amount of calculation, and is suitable for any mode of SAR system, especially for The echo generation of the target in a large scene is easy to introduce platform motion error.

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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Patent Type & Authority Patents(China)
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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