Research On Time Difference Location Based On Special Signals

Time difference location technology is a kind of important passive location method, it is through three and three or more standing measurement signal to reach the base station of time to complete the positioning. TDOA location with high positioning accuracy and low intercept probability, the advantages of "four counteraction" ability, so widely used in modern electronic warfare.With the extensive use of radar electromagnetic environment is complex and changeful form, in the modern war if the enemy radiation sources accurately will occupy the leading position in electronic warfare.This paper selects special signal to two widely used:TACAN signal and JTIDS signal are introduced in detail in this paper. The TACAN signal is widely used in aircraft carrier formation, while the JTIDS system is combined with information communication, navigation, tactical command and control in one of the distribution for the United States armed forces joint operation and the development of the design.In this paper, the research content mainly according to the time difference between two kinds of special signal positioning, first introduced two kinds of special signal of the signal structure, and then separately studied two special signal detecting method, time estimation method, finally the time orientation of introduction, mainly includes:position coordinate system selection, localization algorithm, fuzzy positioning, positioning accuracy, etc.Through the introduction to this article want to make readers based on TACAN and JTIDS the time difference between these two kinds of special signal positioning technology has a more comprehensive understanding.