Phase-cancellation-based target detection method for clutter suppression of agile coherent radar

Abstract

The invention discloses a phase-cancellation-based target detection method for clutter suppression of an agile coherent radar. The method comprises: carrying out sampling and pulse compression on a radar echo pulse signal to obtain a pulse pressure echo; carrying out clutter suppression on the pulse pressure echo by using a phase cancellation technique and carrying out phase correction on the echoby phase compensation; and then carrying out non-uniform Fourier transform and mean-like constant false alarm detection to realize coherent accumulation of the echo signal and moving target detection. Therefore, a problem that the clutter suppression can not be realized effectively because the Doppler frequency range of the clutter cannot be accurately estimated and no deep clutter depression canbe formed in the actual main clutter region while the echo data not sufficient in the prior art is solved. According to the invention, a deep clutter recession part can be formed in an actual main clutter region without massive echo data, so that clutters are suppressed effectively.

Description

technical field [0001] The invention belongs to the field of signal processing, and further relates to a target detection method based on phase cancellation and phase coherent radar clutter suppression in the technical field of radar signal processing. This method can be used in agile phase coherent radar system to suppress clutter and realize the detection of moving targets. Background technique [0002] Agile phase coherent radar changes the carrier frequency of adjacent transmitted signals, so that the opposing radar jammer cannot accurately measure the frequency of transmitted signals, thereby achieving the purpose of avoiding most of the interference. It is a very effective anti-jamming method. However, due to the carrier frequency agility of the transmitted signal, the phase of the echo signal is discontinuous, which makes it impossible for the agile coherent radar to adopt the traditional moving target indication (Moving Target Indication, MTI), adaptive moving target...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that a large amount of echo data is required, and in the case of insufficient echo data, the Doppler frequency range of the clutter cannot be accurately estimated, and deep clutter cannot be formed in the actual main clutter area. wave notches, thus not effectively suppressing the clutter

The disadvantage of this method is that it is only for the static situation of the radar receiver. When the radar receiver moves, the clutter spectrum will broaden, and the clutter outside the zero frequency will not be effectively suppressed. It must be similar to the target energy, which is prone to false alarms

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