Research On Active Interference Mechanism Of Millimeter Wave AC Radiometer

Aiming at the great threat to the armored target brought by the millimeter-wave(MMW)alternating radiometer used in terminal sensitive projectile,the poor effectiveness of MMW alternating radiometer passive jamming method and the lack of active jamming method,the research on the active jamming mechanism against MMW alternating radiometer is systematically analyzed in this dissertation,which includes the analysis of terminal sensitive projectile MMW passive detecting mechanism,the analysis and implementation of active jamming mechanism,active jamming experiments and effectiveness evaluation etc.The main research can be summarized as follows:(1)Based on a brief introduction of terminal sensitive detecting process,the executable jamming methods at various stages are analyzed in detail.Combined with terminal sensitive projectile MMW passive detecting mechanism,the alternating radiometer target signal waveform characteristics and target recognition method are illustrated.At last,the research direction of active jamming mechanism based on waveform characteristic simulation is clarified through waveform characteristic jamming analysis.(2)An active decoy jamming method against MMW alternating radiometer is proposed.Firstly the antenna temperature signal model of MMW jamming source is established.Then,the active decoy jamming mechanism is deeply analyzed and verified in MATLAB simulation environment.To satisfy the specific implementation requirements of active decoy jamming,the reasonable transmit power range of jamming source and the width of jamming strip in different detection altitude are calculated as well.(3)A multi-source regional jamming method against MMW alternating radiometer is proposed.In order to quickly obtain the antenna temperature signal waveform under specific detection conditions,which is used to modulate wide-band MMW noise source as transmitting signal of the jamming source,the simulation analysis model of simple stereo target radiation characteristic is established based on the ray-tracing method.Based on the transmitting signal generation model of the jamming source and the radiometer receiving model,the multi-source regional jamming mechanism is deeply analyzed and verified in MATLAB simulation environment.Also,to satisfy the specific implementation requirements of multi-source regional jamming,the jamming source arrangement space is calculated.At last,the programmable signal analog generation module is designed,realized,and debugged on the FPGA platform,and a MMW jamming source prototype is debugged.(4)Based on the MMW alternating radiometer prototype used in terminal sensitive projectile and the MMW jamming source prototype,the active jamming experiments are carried out.The experiment results demonstrated that both of the proposed active jamming methods can successfully jam the MMW alternating radiometer used in terminal sensitive projectile.Based on experimental data,the jamming effectiveness of the active jamming methods is evaluated by fuzzy comprehensive evaluation,indicating that the multi-source regional jamming method performs better than the active decoy jamming method.