A Disambiguation Technique for Passive Localization Using Trajectory Analysis.

In some well-known passive localization methods, when the number of equations equals the number of unknown object coordinates, there arise finite number of possible solutions. A localization disambiguation technique is required to identify the correct solution in these cases. As an example, the exact solution of time-difference-of-arrival (TDOA) based equations for four receiver sites, leads to a couple of solutions with only one of them being the true target position. This ambiguity conventionally is resolved by using angle-of-arrival measurements or using an additional receiver site, which increase the cost and complexity of the system. In this paper, a localization disambiguation technique for a moving target based on sequential measurements is presented. In the proposed method, the correct solution corresponding to each measurement is identified by determining the most sensible path of the target. The method analytically finds the position of the target and no extra measurement/site is required. Performance of the proposed method has been evaluated and verified in numerous simulations as well as real data based on TDOA measurements. [ABSTRACT FROM AUTHOR]