Research On TDOA/FDOA Interference Source Location Technology

With the rapid development of wireless communication technology,satellite communication technology has been widely used in various fields of society.Satellite communication is an important supplement and extension of ground communication.It can provide communication services in areas such as the ocean and desert where ground base stations cannot be constructed.However,in the face of increasingly complex electromagnetic space environments and intentional or unintentional interference with communication satellites,it is important to quickly and accurately locate the interference source.First of all,this paper summarizes the passive positioning technology and system of joint time difference and frequency difference in the satellite communication system,analyzes the research background and significance of passive positioning technology,and at the same time carries out the development status of passive positioning system.Subsequently,this paper mainly analyzes and simulates the TDOA(Time Difference of Arrival)and FDOA(Frequency of Arrival Frequency Difference)parameter estimation methods in the TDOA / FDOA joint interference source location.For the TDOA / FDOA joint parameter estimation method based on the cross-ambiguity function,A method based on frequency-domain phase difference interpolation is proposed.This method estimates the FDOA parameters by linearly interpolating the phase difference of the spectrum peak.The simulation results show that the parameter estimation accuracy can be effectively improved.At the same time,a positioning solution method based on CAFI is proposed.The simulation results show that the positioning accuracy can be effectively improved compared with the CAF method.This paper studies the accuracy of TDOA,FDOA,and TDOA / FDOA joint parameter estimation,and the effect of parameter accuracy on positioning accuracy.The methods for improving the accuracy of parameter estimation are proposed,which has certain reference value for solving the problem of satellite interference source positioning.