An improved vector parameter estimation algorithm for target terminal trajectory

A small antenna array for measuring terminal trajectory of the target of interest, which is supposed to be in uniform rectilinear motion, is proposed. Based on the model, the parameterized representation of target terminal trajectory is discussed, and the measurement equations which describe the relationships between the parameters of target trajectory and those of the Doppler echoes received from the target by the antenna array are established. On the basis of measurement equations, an idea of estimating the Vector parameters without resolving the phase difference ambiguity is developed, furthermore, a two-step numerical optimization technique to estimate these trajectory parameters from Doppler frequency and phase difference estimate sequences is put forward. The Monte Carlo simulation results demonstrate the effectiveness and reliability of our numerical optimization algorithm, compared with traditional method.