Research On Key Technologies Of DTMB Passive Radar System

Passive radar is a bistatic radar that uses third-party radiation source signals for target detection.It does not radiate electromagnetic waves itself,and has the advantages of resisting electronic detection,stealth and destruction.Passive radar detects targets through the direct signals emitted by commercial or civilian radiation sources and the signals scattered by the targets.At present,common radiation sources are: digital television signals(DTMB),FM broadcasting,mobile communication signals,wireless local area networks,and global positioning system signals.Among them,digital television signals have the advantages of stable transmission power,high bandwidth,and wide coverage.In recent years,the radiation source signal has received wide attention in the field of external radiation radar.This thesis studies the key technical issues of the DTMB passive radar system,which mainly involves some signal preprocessing before the DTMB passive radar system performs target detection,the related processing technology during target detection,and the synthesis of the motion trajectory after target detection.Processing,etc.Specific research contents include:1.External radiation source radar system composition architecture and signal processing flow,DTMB signal standard,feasibility analysis of DTMB signal as external radiation source radar radiation source,and influence of signal structure on external radiation source radar target detection.2.DTMB passive radar interference suppression technology,including the use of signal reconstruction method to achieve reference channel purification and the use of ECA-B algorithm to achieve monitoring channel multipath suppression.3.DTMB passive radar target detection technology,including two-dimensional cross-correlation processing to improve the target signal-to-noise ratio and the use of frame header zeroing to reduce the impact of secondary peaks on target detection.4.Angle measurement technology of passive radar including uniform linear array multi-beam forming method and angle of arrival estimation using sum and difference beam angle measurement.5.Establish a target tracking model of the passive radar,and provide specific implementation solutions for the filtering prediction,track initiation,point-to-track correlation,and track extinction algorithms in the tracking model.6.Designed a DTMB passive radar simulation experiment system,set up a simulation experiment scenario,verified the key signal processing algorithms through the simulation results,and realized the ranging,velocity,and angle measurement of moving targets in the surveillance area.After detection,track processing is performed to complete the accurate display of the target motion trajectory.