SAR echo rapid simulation method based on sub-aperture and equivalent scatterer

A technology of equivalent scattering and simulation method, applied in the direction of using re-radiation, radio wave measurement system, radio wave reflection/re-radiation, etc., can solve the problems of high simulation accuracy, long simulation time, short simulation time and so on

Inactive Publication Date: 2009-09-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

The simulation accuracy based on the one-dimensional frequency domain Fourier transform method is high, and the simulation time is long
The two-dimensional frequency-domain Fourier transform metho

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  • SAR echo rapid simulation method based on sub-aperture and equivalent scatterer
  • SAR echo rapid simulation method based on sub-aperture and equivalent scatterer
  • SAR echo rapid simulation method based on sub-aperture and equivalent scatterer

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Embodiment Construction

[0041] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0042] The echo simulation method of the invention takes natural scene complex scattering coefficient and radar track information as input parameters, and successively goes through five steps: pulse group division, scene division, system impulse response calculation, range processing and azimuth approximation processing, Finally, the SAR natural scene echo is obtained.

[0043] figure 1 It is a flow chart of a method for fast simulation of synthetic aperture radar echoes based on sub-apertures and equivalent scatterers according to an exemplary embodiment of the present invention.

[0044] In step 101, the pulses corresponding to all the track points are divided into several equal-length pulse groups along the flight direction of the radar, and t...

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Abstract

The invention relates to a synthetic aperture radar echo rapid simulation method based on sub-aperture and equivalent scatterer, comprising the following steps: 1) pulses corresponding to all track points are divided into a plurality of pulse groups with equal length along the radar flying direction; 2) a scene is divided into a plurality of small rectangular scenes with the same size, and equidistance rings are divided according to the distance between a radar platform and the target scene; 3) in every equidistance annular region of the small rectangular scene, the backscattering coefficient of the equivalent scatterer is calculated, and a pulse response function of the system is obtained; 4) the range direction processing is carried out, and an echo signal of the central pulse of the pulse groups is obtained by the convolution of an emission signal and the pulse response function; 5) azimuth direction processing is carried out, and echo signals of any other pulses in the pulse groups are calculated by the echo signal of the central impulse in the impulse groups. The method of the invention has the advantages of rapid speed and high precision of the frequency domain processing method, introduces the expansion approximate processing of the azimuth direction and effectively improves the simulation velocity.

Description

technical field [0001] The invention relates to a radar signal echo simulation method, more particularly, to a synthetic aperture radar echo fast simulation method suitable for natural scenes. Background technique [0002] The objects of synthetic aperture radar (SAR) echo simulation are mainly divided into artificial scenes and natural scenes. The artificial scene echo simulation refers to the simulation of the echo signals of artificially produced point targets and lattice targets, and the natural scene echo simulation refers to the simulation of the echo signals of the real natural environment. For general SAR simulation studies, point targets and lattice targets are sufficient. However, when studying high-precision motion compensation algorithms, scene matching algorithms in SAR guidance, etc., point target simulation has been difficult to meet the requirements, so it is necessary to simulate the echo data of natural scenes. [0003] The existing natural scene echo sim...

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
Inventor 丁泽刚王彦华曾涛龙腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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