Target detection method based on coherent radar non-coherent accumulation mode

Abstract

The invention discloses a target detection method based on a coherent radar non-coherent accumulation mode. The method comprises the following steps: S1, performing sampling to obtain a frame of two-dimensional echo data; S2, performing pulse compression on each piece of data in the S1; S3, performing range walk calibration on the data in the S2; S4, performing coherent accumulation on the data in the S3; S5, repeating the steps S1 to S4 to obtain multi-frame coherent accumulation data; S6, performing inter-frame alignment on the multi-frame coherent accumulation data obtained in the step S5; S7, performing non-coherent accumulation on the multi-frame coherent accumulation data after inter-frame alignment; and S8, performing target detection based on the non-coherent accumulation data in the S7. The method has the advantages that range walk calibration is realized based on an inter-pulse autocorrelation method, and the detection of a moving target subjected to long-time coherent accumulation is realized; according to the method, after peak target alignment is carried out on two-dimensional data planes among multiple adjacent frames, non-coherent accumulation is carried out, then target detection is carried out, the purpose of improving the signal-to-noise ratio is achieved, and meanwhile target speed estimation can be achieved.

Description

technical field [0001] The invention relates to the technical field of target detection, in particular to a target detection method based on a non-coherent accumulation method of coherent radar. Background technique [0002] Space-based warning radar is an important application field in the development of space-based radar. It is of great significance to realize the moving target indication function of space-based warning radar, and its target detection method has become a hot spot in the research of radar signal processing. The accumulation of weak target energy is the main research direction to improve the echo signal-to-noise ratio and realize weak target detection. However, due to the design requirements of light weight and low power consumption of space-based radar, its transmission power and antenna gain are all limited. When performing target warning, it often achieves capability accumulation through long-term coherent accumulation to achieve long-distance detection....

AI Technical Summary

Problems solved by technology

However, these algorithms have a huge amount of computation, and their applications on space-based radar real-time processing platforms are limited

At the same time, for space-based warning radars, if the speed of movement is unknown and there is a problem of Doppler frequency folding, this also increases the difficulty of distance walking compensation and phase supplementation

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