Research On Key Technologies Of Millimeter Wave Active And Passive Composite Detection

In this dissertation,the passive/active compounding detection method is adopted in response to situation that terminal sensitive projectile with single millimeter-wave(MMW)passive detector is easily affected by active decoy jamming.MMW active detection and MMW passive detection work at different frequency bands for target identification at the same time.The main research can be summarized includes:The MMW passive detection mechanism is analyzed,and the output signal model of MMW radiometer is established.Based on the analysis of active jamming,active cancellation jamming and active decoy jamming,MMW passive/active compounding detection is presented aiming at anti-jamming performance improving.LFMCW radar beat frequency signal model is established and the MMW active detection distance is analyzed.The influences of different factors on range profile are studied.A method of features extraction of the MMW active detection is proposed based on the target’s features of range profile.The anti-jamming performance of LFMCW radar is also analyzed.A method using D-S evidence theory for information fusion at decision level is designed,and the basic probability assignment(BPA)of D-S evidence theory is obtained by using fuzzy set theory.In view of the problem of evidence conflict in D-S evidence theory,a method using improved D-S evidence theory for information fusion is presented,and it’s validity is proved by simulation.The weight of the compounding detector is analyzed,and the weighting method of each detector is put forward.A prototype of the MMW active/passive compounding detector for the terminal sensitive projectile is developed.Compounding detection system performance is tested by semi-physical simulation test on the tall building.The results show that the simulated target can be detected and identified by MMW active/passive composite detector at 110m distance.