Optimization method for detecting weak and small sea surface target by combining multi-frame echoes and phase-coherent accumulation

Abstract

The invention discloses an optimization method for detecting weak and small sea surface targets by combining multi-frame echoes and phase-coherent accumulation. The optimization method comprises the steps that a pulse Doppler radar is utilized to mechanically scan movable sea surface targets within a detection range so as to obtain the echoes of the pulse Doppler radar, pulse compression processing is conducted on the echoes of the pulse Doppler radar to obtain Doppler radar echo data undergoing pulse compression processing, it is determined that the starting pulse of Kth window sliding is the Kth pulse, and Tth-frame pulse compressed echo data undergoing Kth window sliding interception is obtained, further pulse compressed echo data undergoing Kth window sliding interception after movable target detection processing and the Hth column of elements are sequentially calculated, further a complete N * (N''-L + 1) dimensional data matrix is obtained, two-dimensional constant false alarm detection is conducted on the complete N * (N''-L + 1) dimensional data matrix to obtain the N * (N''-L + 1) dimensional data matrix undergoing the two-dimensional constant false alarm detection, and if the element values contained by the N * (N''-L + 1) dimensional data matrix undergoing the two-dimensional constant false alarm detection are greater than 0, the echoes of the pulse Doppler radar contain weak and small moving sea surface targets.

Description

technical field [0001] The present invention relates to the technical field of signal processing, in particular to an optimization method for multi-frame echo joint coherent accumulation to detect weak and small targets on the sea surface, which is suitable for efficient accumulation of weak and small targets on the sea surface by pulse Doppler radar, thereby realizing the detection of weak and small targets on the sea surface . Background technique [0002] For the detection of weak and slow targets on the sea surface, due to the complex and changeable sea surface environment, the fluctuation of waves and other factors, the low signal-to-noise ratio is still the main factor restricting the performance of radar for sea target detection. In radar signal processing, signal energy can be increased by pulse compression and coherent accumulation. However, due to the movement of the target, the distance walking of the echo will occur, so a series of operations of correcting the d...

AI Technical Summary

Problems solved by technology

[0004] For single-frame echoes, pulse compression and coherent accumulation can effectively increase the signal energy. However, since sea clutter is a real echo, it has a certain correlation in a short period of time and can also be accumulated to a certain extent.

Therefore, the effect of pulse pressure and single-frame coherent accumulation on the sea surface data with strong clutter is not ideal for improving the signal-to-noise ratio

Therefore, it is necessary to use the information of multi-frame echoes, but when multi-frame echoes are jointly processed, there will be discontinuous distance walking and Doppler phase misalignment, both of which will lead to a decrease in the detection performance of the target

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