Analysis of Ambiguity of 4-Station 3D TDOA Positioning

Aimed at the ambiguity that may occur in the passive 4-station 3D TDOA positioning systems,when using the non-iterative method to solve a nonlinear time difference equation,its simulative analysis was done,and it was concluded that positioning ambiguity exists within the bigger range for the different disposition of stations and altitude.The method of de-ambiguity was analyzed briefly,and the de-ambiguity by using the method of height was given.