Abstract:
The location of a moving emitting source is a key problem in the field of electronic countermeasures. One of the effective solutions to solve this problem is the passive location closed-form algorithm based on the time difference of arrival (TDOA) and frequency difference of arrival (FDOA) measurements. However, in order to satisfy the requirement of the above algorithm, at least 5 nodes need to collaborate to complete a location task. Given the closed-form frame of passive location algorithm, by combining the angle of arrival (AOA), TDOA and FDOA measurements, a novel location algorithm is proposed to reduce the number of collaborative platforms. The approximate algebraic relationships are derived between the moving source position and the measurements with platform positions. According to the aforementioned conditions, the closed formed expressions can be calculated by joint AOA-TDOA-FDOA mechanism. The theoretical analysis demonstrates that solution accuracy of the proposed location algorithm can achieve the Cramér–Rao lower bound (CRLB), some numerical simulation results coincide with the theoretical results.