Phase-coherent accumulation detecting method capable of revising first-order and second-order range migration at the same time

Abstract

The invention belongs to the technical field of radar weak signal detection and particularly relates to a phase-coherent accumulation detecting method capable of revising first-order and second-order range migration at the same time. The method comprises the steps that echo signals are subjected to Fourier transform in a quick time domain, and a quick time frequency domain echo signal expression with only first-order range walking and second-order range curvature considered is obtained; through second-order keystone transform, the quick time frequency domain echo signal expression with only first-order range walking and second-order range curvature considered is subjected to second-order range curvature revising, and echo signals of a two-dimensional time domain obtained after second-order range curvature revising are obtained; through Hough transform, the echo signals of the two-dimensional time domain obtained after second-order range curvature revising are subjected to first-order range walking revising, and echo signals of time domains obtained after two-time range revising are obtained; and the echo signals of the time domains obtained after two-time range revising are subjected to pulse compression and phase-coherent accumulation detecting.

Description

technical field [0001] The invention belongs to the technical field of radar weak signal detection, in particular to a coherent accumulation detection method for simultaneously correcting first-order and second-order distance migration, and further relates to a simultaneous detection method based on keystone transform and Hough transform in the field of radar target detection Coherent accumulation detection method for correcting first- and second-order distance migration. The invention can eliminate the distance migration caused by the high-speed movement of the target in the air defense warning radar system, so as to improve the signal-to-noise ratio of the detected target, and can be used to solve the weak signal detection problem in the case that some radar moving target signal parameters are unknown or difficult to estimate. Background technique [0002] In recent years, with the development of radar technology, the defense capability and detection performance of homelan...

AI Technical Summary

Problems solved by technology

The invention can not only effectively eliminate the distance migration caused by the high-speed movement of the target, but also make the long-term accumulation of pulses no longer affected by the high-speed movement of the target. Signal-to-noise ratio, and without the prior condition of the target, it can solve the problem of weak target detection whose target parameters are unknown or difficult to estimate, and further improves the weak signal detection performance in the case of extremely low signal-to-noise ratio.

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