Passive Tracking Technology Of Arial Moving Target Based On Single Satellite Asymmetric Interferometer

The electronic reconnaissance technology of the spaceborne platform has been greatly developed by various space power countries due to factors such as wide reconnaissance scope and no national border restrictions.At present,when various types of long-range UAVs,fighters,early warning aircraft,etc.are in flight,the signals from their airborne radar and satellite communication equipment may also be intercepted by satellites and be located.However,due to its fast motion and movement in three-dimensional space,how to realize the locating and tracking of the moving target radiation source by a single satellite is a hot issue in the field of aerospace electronic reconnaissance.In order to improve the reconnaissance sensitivity and reduce the volume and weight of satellite payload,this paper proposes a single-satellite passive locating system that uses a large-diameter antenna combined with multiple small-diameter antennas to form an asymmetric interferometer to detect and track airborne moving radiation sources.The main work of this paper are as follows:(1)Aiming at the low signal-to-noise ratio of the signal received by the small-diameter antenna,the method of using the signal received by the large-diameter antenna to realize the signal time-frequency domain detection,guiding the interception and acquisition of the received signal of the small-diameter antenna to measure the phase difference and the phase difference change rate is studied.Regarding the phase difference measurement method,a multi-line based asymmetric interferometer phase difference measurement method is proposed.Simulation analysis proves that this method can effectively measure the phase difference.Regarding the measurement method of the phase difference change rate,the phase difference change rate measurement method of asymmetric interferometer based on least squares is proposed.The phase difference change rate is extracted by using multiple phase difference data.The simulation analysis shows that this method can effectively measure the phase difference change rate.(2)A method for measuring the Doppler rate of change using the received signal of the large-diameter antenna is studied.Aiming at the problem that the phase-encoded signal is difficult to directly measure the Doppler rate of change due to phase jump,the method of measuring the Doppler rate of change using the spectral phase of the signal after the exponentiation is studied.The exponentiation process eliminates the phase jump and converts the phase-encoded signal into a single-frequency signal to measure the Doppler rate of change.For the phase fuzzy interference of the frequency component in the spectral phase measurement,the signal is evenly sliced and accumulated,and multiple spectral phase parameters are obtained and then differentially processed to eliminate the influence of phase blur caused by the frequency,and then the Doppler rate of change is extracted.Simulation analysis proves that this method can effectively measure the Doppler rate of change.(3)In order to obtain high-precision estimates of the position,speed and heading of the moving target,a cubature information filtering algorithm with multi-parameter fusion is proposed to study the single-satellite passive locating and tracking technology.The method combines the target position information contained in the angle with the target motion information included in the Doppler change rate and the phase difference change rate,and initializes the algorithm by using the instantaneous direction finding passive location technique.The simulation analysis shows that this method can quickly and accurately locate and track the moving targets in the air.This paper has a certain theoretical and engineering application reference value for the future aerospace electronic reconnaissance.