A Wideband/Narrowband Fusion-Based Motion Estimation Method for Maneuvering Target

In this paper, a new wideband/narrowband fusion-based motion estimation method is proposed for maneuvering target. In the fusion scheme, a fast motion parameters estimation method based on cross-correlation of adjacent echoes (CCAE) is adopted as the wideband estimation method. The narrowband estimation method is the maximum likelihood estimation with Newton's method (MN method). The proposed method mainly includes three steps. First, the velocity and acceleration of the target are estimated by CCAE. Second, the velocity and acceleration estimated by CCAE are adopted as the initial velocity and final acceleration of MN method, respectively. Finally, the high precision velocity and distance of the target are estimated by MN method. The proposed fusion method has two advantages. First, due to the large scope of the unambiguous velocity of CCAE, the velocity ambiguity problem of MN method is solved. Second, the three dimensional (3D) search in MN method is reduced to two dimensional (2D) search. The simulation results demonstrate that the proposed fusion method achieves similar estimation performances on distance and velocity with much lower computational cost, compared with the MN method.