Ground accelerating moving target imaging method based on quadratic fit range equation

Abstract

The invention belongs to the technical field of radar, and discloses a ground accelerating moving target imaging method based on a quadratic fit range equation. The method is used for imaging a ground accelerating moving target through synthetic aperture radar. The method includes the steps that (1) quadratic fit is carried out on a target range equation, (2) an original echo signal of the target is changed into a two-dimensional frequency domain, (3) according to the fitted secondary range equation, a range matching filter is built in the two-dimensional frequency domain and range compression and range cell migration correction are carried out, (4) the signal after range compression and range cell migration correction is changed into a range Doppler domain, (5) an azimuth matching filter is built in the range Doppler domain and direction compression is carried out, (6) azimuth inverse discrete fourier transform is carried out on the signal after direction compression, and imaging of the target is finished. Precise imaging of the ground accelerating moving target can be achieved without the need of knowing speed parameters, position parameters and the acceleration speed of the target, and calculation efficiency is high.

Description

technical field The invention belongs to the field of radar technology, in particular to a method for imaging ground accelerating moving targets based on a quadratic fitting distance equation, which is used for synthetic aperture radar (SAR) imaging of ground accelerating moving targets. Background technique Synthetic Aperture Radar (SAR) is an active system that uses electromagnetic waves in the microwave spectrum as a detection carrier to observe surface features. SAR has the characteristics of two-dimensional high-resolution, all-weather all-weather, strong penetrability, rich scattering information, multi-function and multi-purpose, so SAR imaging technology has become a hot research direction, and has been widely used in military and civilian applications. Applications. The spaceborne SAR ground moving target detection system (Synthetic Aperture Radar-Ground Moving Target Indication, SAR-GMTI) is the development of SAR technology. Ground moving targets, and the detec...

AI Technical Summary

Problems solved by technology

For the first time, J. Sharma from Canada studied the influence of target acceleration on the performance of target motion parameter estimation in SAR-GMTI system through theoretical analysis and practical experiments, but failed to pro

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