The Method Against Range-velocity False Targets Under The Ultra-high Speed Targets Detection Of Radar

The range-velocity synchronous false target jamming based on digital radio frequency memory(DRFM)technology can deceive radar in range-velocity dimensions simultaneously.The waveform of the jamming has high similarity with target echoes,which can confuse the radar stronger.Range migration and unneglected intra-pulse Doppler modulation induced by ultra-high-speed target will decrease the range and velocity tracking performance of radar.Therefore the radar should have the ability to counter the range-velocity synchronous false target jamming under the scene of ultra-high-speed target effevtively.In this paper,the transmitted signal is linear frequency modulation(LFM)signal and the echo model is based on the ultra-high-speed target.The paper analyzes the reason for decline of range and velocity tracking performance,proposes keystone conversion to correct the range migration,and compensate the velocity of target by change the chirp rate of the LFM signal.This paper studies the mechanism of the range-velocity synchronous false target jamming based on DRFM technology,modulates range-velocity synchronous false target jamming in the ultra-high-speed target echo.The simulation results prove that the jamming effect is stronger than the sole range or velocity jamming.In ultra-high-speed target scenes,the time of traditional range-velocity memory tracking against range-velocity synchronous false target jamming is limited which decrease the memory tracking performance.Range-velocity-azimuth-pitch four dimensions tracking and improved ?-?-? memory tracking algorithm is proposed to identify and counter range-velocity synchronous false target jamming.One innovation of this method proposed by this paper is that continuous motion could be predicted during a period of time,which breaks the limitation of one step prediction of the traditional ?-?-? algorithm.The other innovation is that range-velocity-azimuth-pitch dimensions memory tracking breaks the limitations of range-velocity dimensions memory tracking,improves the reliability of memory tracking in the scene of the ultra-high-speed target.Simulation results prove that the anti-jamming method can counter the range-velocity synchronous false target jamming under the scene of the ultra-high-speed target effectively.