Inverse synthetic aperture radar imaging method based on time-phase derivative distribution

Abstract

The invention discloses an inverse synthetic aperture radar imaging method based on time-phase derivative distribution. Under the situation of very complicated object motion, the Doppler frequency of echo signals of scatter points is time-varying, and an image obtained by using a traditional distance-Doppler imaging method is vague at the moment so that an object is difficult to identify. In the invention, the echo signals of the scatter points are described to be multi-component quartic-phase signals, and a parameter evaluation method based on the time-phase derivative distribution is proposed in specific to the situation of single-component signals; and a parameter evaluation method in which product type time-phase derivative distribution is adopted and a clean technology is combined, is proposed in specific to the situation of multi-component signals. Finally, a transient image with a clear object is obtained by combining a distance-transient Doppler imaging method.

Description

Technical field [0001] The invention belongs to the field of radar technology, and particularly relates to an inverse synthetic aperture radar imaging method. Background technique [0002] In inverse synthetic aperture radar imaging, the imaging method with the smallest amount of calculation and the most commonly used so far is the distance-Doppler algorithm. The longitudinal range resolution depends on the radar transmitting broadband signals, and the lateral resolution depends on the Doppler of the target rotation. Frequency, first through motion compensation to make the target a turntable target with the "self-focusing point" at the axis, and then perform imaging processing. The entire imaging process can be understood as: using the different time delays of the sub-echoes of the scattering points on the target and the different Doppler frequencies of the sub-echoes when the target rotates, showing the intensity of the target scattering points on the distance-Doppler plane Dis...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the imaging method adopted by the prior art for complex moving targets (due to the complex time-frequency characteristics of the echo signals of its scattering points), which cannot produce high-quality images, and propose a new method based on time-phase derivative Distributed inverse synthetic aperture radar imaging method to obtain clear transient images of targets

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