A Novel Method to Analyze Accuracy of Target Measurement Based on Entropy

In radar tracking, the relationship between target motion and radar measurement is nonlinear, which is described by conversion function from polar to Cartesian coordinate. In this paper, based on information entropy, a new method is presented to measure the amount of target Cartesian position information acquired from radar polar coordinate. Furthermore, by applying linear approximation and without approximation of the nonlinear conversion function, the factors affecting the accuracy of target position obtained from radar polar measurement are analyzed based on the proposed entropy. With the proposed analysis method, it is proved that with the increase of measurement precision and the decrease of radial range, the target position accuracy acquired from radar polar measurements increases, and it is independent of the target bearing.