Study On Passive Location Of Emitter

Passive location of emitter source has been playing an important role in navigation, aviation, aerospace and electronic warfare with its outstanding features such as longer range and better concealment. Based on the configure of stations, the location method, algorithm, accuracy and performance for multistations and single station are studied in this thesis, and the computer simulation results are given out. This study provides the designation and execution of passive location of emitter an important theory foundation and experiment data. The main contents are as following. The first chapter is a brief introduction to passive location of its backgrounds, present states and importance. The accuracy of DOA location from multistations is discussed in Chapter 2. The problem of location is solved by the psedoinverse of matrix with the least squared error. The general formulae of location and accuracy are presented with simulation figure, and the optimal stations configure is derived out. The analysis of location accuracy of DTOA from multistations is discussed in Chapter 3. The formula of location accuracy is derived from the least squared error estimation, especially with the relationship of location error with the TOA error, the position error of stations. The stations are conformed to win the best effect of location according to the number of stations with the contour of accuracy. Chapet 4 shows two kinds of algorithm of location with DTOA, direct hyperbolas cross location and plains intersection location. The formula of hyperbolas location is given out directly for the position of emitter according to the DTOAs between three stations with discussions of area of ambiguity and no solution. In 3桪imensions, a group of DTOAs between 3 stations determines a plain in which the emitter lies, while these stations lie in a conic and the emitter at the foci. A modified approach is introduced to reduce the computation and keep the performance, least squared error0 The algorithm and accuracy of location using difference of Doppler ~wt~ frequency(DD) are presented in Chapter 5 with formulae of least squared error. Because of the complication of this problem, the location of fixed emitter from moving stations is chosen to be discussed. The contour of DD and one sigma location error of DD figure between two moving stations are discussed to win the optimal configure of moving stations. Based on the least squared error estimation, the formulae and figures of location error are discussed especially with the typical station configures. The problems of location of emitter from multistations using multiparameters are studied in Chapter 6. This method has the advantages of fewer stations and less location error. The optimal configure, analytical solution and location accuracy using DOA桾DOA, DOA桪D and TDOA桪D are given out with some figures. Chapter 7 is contributed to the problems of location from one moving station with the formulae of location figure, physical sense and affect factors using measurement of TDOA, DD and PRC. At the end of this chapter, analytical formulae of location and location accuracy using DOA桪D, DOA桺RC are derived with some computation results. These methods have the advantages of less time and less error. Finally, an overview of author?s work and the prospect of passive location...