Abstract:This paper takes the space four-station time difference positioning system as an example to explain the principle of the multi-station time difference positioning system, derives the positioning accuracy of the positioning system and analyzes the factors that affect the system positioning accuracy. Through simulation multi-station location system different spatial configurations, station spacing, the time difference measurement error, the position error of the positioning accuracy in the condition of the ground radiation derived: multi-station spatial configuration location system directly affect the positioning accuracy, the longer the distance between the main and auxiliary stations, the better the positioning accuracy; the position error of each station has a greater influence on the positioning accuracy than the time difference measurement error; for an asymmetric spatial configuration of the multi-station positioning system, by rational station optimization can improve the positioning accuracy of a fixed radiation source.