A Location Method of Torpedo Terminal Trajectory Based on Cross Spectrum Method

A passive location method based on short-time cross spectrum method is proposed to improve the passive location accuracy of a torpedo terminal trajectory measurement system. The measurement system established according to this method is introduced, the passive location algorithm of a target is given. The angle measurement accuracy, the noise influence and the typical trajectory are simulated and analyzed in the measuring area. Simulation results show that for the signal-to-noise ratio(SNR) of 10 dB, when the target is on the arc of an ±40° region and the distance between the arc and the measuring subarray is 80 m, the direction finding accuracy of the proposed location method is improved by 0.15°, and the absolute error of typical trajectory is generally reduced by 0.4 m. This research may provide a reference for evaluating torpedo effectiveness.