Research And Implementation Ofthe Key Technologies Of FDOA Location

Passive location of emitter sources has many advantages such as long detected distance,much better security,uneasy to disturb.To improve the viability of the system in an electronic warfare environment they play an important role.With the development of frequency measurement,signal interception and processing technology,the FDOA location technology is playing an increasingly important role.This paper studies the situation under space borne platform,based on the Doppler frequency difference between the passive localization of key technologies.Frequency difference for the positioning gives a detailed derivation of the algorithm and simulation analysis,including positioning algorithm and positioning accuracy of the algorithm.In addition,a satellite receiver receives a signal capacity of small,low signal to noise ratio,so the detection of the Doppler frequency becomes a frequency difference localization of key technologies,based on this study,two weak Doppler signals measurement to weak signal noise cancellation technology,obtain a more satisfactory simulation results.The main contents of this paper are summarized as follows:1.Introducing the space borne passive location system on the basis of theory,Samsung,four-frequency differential location theory system.2,Based on the WGS-84 Earth model for satellites in geosynchronous orbit,conducting research and simulation under Samsung,four criteria targeting methods.3,Based on the frequency difference equation study Samsung,four frequency differences positioning accuracy of geometric dilution calculations and curve positioning,and depending on the error parameter simulation analysis of the positioning error.4,Describing two methods of detection of weak signals A wavelet threshold method,one is the multiple autocorrelation.Among them,this paper has improved wavelet threshold function.And the two methods were simulated.5,Designing a Matlab GUI interface,which can enable Samsung to set the frequency difference positioning and positioning accuracy simulation function under a four-star conditions,as well as the basic parameters and reading.