A Research On Parameters Estimation In Passive Locating System

In modern electronic warfare (EW) and information warfare, the passive locating and tracking system, which utilizes electromagnetic wave emitted by the target, has proved its merits of self-hiding and far-distance detecting. And it is now the hotspot in the field of non-linear tracking and estimation. So the estimation of parameters that carry location information of the target is the premise and key technique to achieve locating.This paper is concerned with the parameters estimation of radar signal from the target emitter. In Chapter 2, the locating theories by using time difference of arrival (TDOA), phase difference rate-of-change and Doppler rate-of-change of the signal are derived. And also a system structure of airborne passive locating system is presented. Chapter 3 analyzes the methods for estimation of TDOA. Taking linear FM pulse signal as an example, it contrasts the performance of real-correlation and complex-correlation. And it analyzes the methods to increase precision of estimation. Chapter 4 analyzes the methods for estimation of phase difference rate-of-change. It presents a method based on multi time-chip decrease variance. Chapter 5 analyzes the methods for estimation of Doppler rate-of-change. With phase coherence considered, an algorithm based on phase difference is proposed. Simulation experiments prove that the algorithm is effective and applicable to dynamic estimation.To sum up, the contents of this paper are mainly about the parameters estimation of TDOA, phase difference rate-of-change and Doppler rate-of-change. Algorithms and methods can be put into practice directly to some extend.