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

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...

AI Technical Summary

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 method is a suboptimal method, and the simulation time is very short, but the simulation accuracy is limited by the type of error added, and the simulation accuracy in the case of motion errors is poor

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