The Research On Active Jamming Perception And High-efficiency Implementation Of Missile-borne Radar Based On Short-Time Fourier Transform

The missile-borne radar can guide the missile to strike enemy targets with high precision and high hits,and the missile-borne radar will also be affected by various jamming signals during its work.With the development of jamming technology in recent years,active jamming poses a serious threat to missile-borne radar systems.The active jamming faced by missile-borne radar systems are usually divided into active blanket jamming,range-type active deception jamming and speed-type active deception jamming.At present,the jamming identification algorithm based on statistics in the project has low efficiency for active jamming identification.Therefore,this thesis focuses on the active jamming perception of missile-borne radar based on the short-time Fourier transform,and the implementation on hardware.The main work and contributions of this thesis are as follows:1.Based on the short-time Fourier transform,the characteristics of the short-time Fourier transform time-frequency diagram of different jamming types based on the Hanning window are analyzed.The architecture of missile-borne radar active jamming perception based on the short-time Fourier transform is presented.2.The existing detection method for the existence of active blanket jamming based on the short-time Fourier transform is further improved,and a detection method for the existence of the time-domain energy fluctuation is researched.Higher probability identification of active blanket jamming type is realized by extracting characteristic parameters such as the center frequency dispersion and the frequency domain envelope fluctuation.3.Aiming the existence of active deception jamming is difficult to detect due to low jamming to noise ratio,a perception method of active deception jamming which integrates detection and identification is proposed.The frequency domain separation method of range-type active deception jamming for linear frequency modulation missileborne radar is realized by using the dechirping technology,and characteristic parameters such as the number of fully coherent targets and discontinuity characteristic parameters are extracted to realize the perception of range-type active deception jamming;using the combination of spectrogram of the short-time Fourier transform in the slow time domain of the multi-pulse train to extract the Doppler characteristic parameters in the frequency domain,and realize the perception of speed-type active deception jamming.4.Based on the time-frequency distribution characteristics of the short-time Fourier transform,the method of extracting the bandwidth of the active blanket jamming and the method of extracting the jamming time sequence parameters of the active intermittent sampling deception jamming are studied..5.In the framework of active jamming perception for missile-borne radar of the short-time Fourier transform,researching the efficient implementation of missile-borne radar active jamming perception algorithm based on multi-core DSP.The hardware platform test results show that the active jamming perception algorithm for missile-borne radar based on the short-time Fourier transform is feasible...