Study On Missile Target Identification Techniques Of Millimeter Wave Fuze In Strong Sea-clutter Background

In modern naval battles,the ammunition of shipboard artillery plays a vital role in taking on the mission of air defense and missile defense at the end of the naval craft.A proximity fuse is the detection and control system of the uncontrolled ammunition of shipboard artillery,which determines the recognition and damage ability of the ammunition.As the main system used in the radio fuse of conventional ammunition of shipboard artillery,the continuous wave Doppler radio proximity fuse has developed gradually into millimeter wave band,for improving the anti-interference ability and reducing the size and weight of the fuse.Currently,the radio proximity fuse allocated for the uncontrolled ammunition of shipboard artillery is facing great challenges.The speed of anti-ship missile is higher and its RCS is smaller,which requires the fuse to recognize the target in shorter time under lower SNR condition.The electromagnetic environment is getting worse on the ships,which requires the fuse to improve electromagnetic compatibility and anti-interference ability.The target echo signal of the millimeter wave Doppler fuse has higher frequency than that of the microwave fuse,and therefore it puts forward higher requirements on processing ability of the signal processor,such as the band and processing speed.The weapon system is becoming more complex and its power dissipation is increasing.Limited by battery power and capacity,the fuse signal processor has to use low-power circuit.In this circumstances,the study on missile target identification techniques of millimeter wave fuse in sea clutter has been carried out under the new situation.The main contents of the research consist of the following items:1.A characteristic analysis of the sea clutter and target echo signals was made.Mainly by using STFT,this paper finded the difference between the sea clutter and target echo signals in time-frequency domain and this laid the foundation to subsequent project.2.A target feature extraction method under strong sea flutter is proposed on the basis of feature analysis between sea clutter and target echo signal.This method is based on frequency point weighting,which can restrain the interference from sea clutter.And then a method of target echo signal detection and explosion point control is designed on account of the difference between sea clutter and target echo in time-frequency domain.3.Data simulation and verification based on MATLAB was experimented,confirming some variables’ value range.4.Semi-physical simulation on the basis of the implement scheme using MCU and FPGA was conducted.