Tracking algorithm of TDoA and DoA measurement switching of passive tracking system

When passive target tracking is performed by using time difference of arrival(TDoA),tracking error is increased because the stations in tracking system can not measure the target signal synchronously sometimes. A new method is proposed,which is by measuring based on the swithching of TDoA and directions of arrival(DoA) tracking methods.The algorithm employs the extended Kalman filter to track the target.TDoA and DoA measurements,and the target position estimation results are obtamed based on the signal acquired by the stations and precision of tracking in a period.The algorithm havs more adaptability than the method of using only the time difference of arrival and the precision of tracking does not decrease.The detailed process of the method is given and the simulation results show that the algorithm is effective.