Parameter Dynamic Estimation in Near-Field Bistatic MIMO Radar System

—This paper proposes a novel algorithm of parameter dynamic estimation in near-field Bistatic Multiple-Input Multiple-Output (MIMO) Radar. When a target lies in the nearfield region, the near-field wavefront is spherical, and the plane waves assumption is no valid. The existing methods and signal model based on the far-field assumption are not applicable to this situation. In this paper, we propose a new near-field signal model in near-field bistatic MIMO Radar. Firstly, Doppler frequency is estimated dynamically by searching the peak of the fractional ambiguity function. The method of projection approximation subspace tracking based on the fractional ambiguity function is proposed to estimate the azimuth angle and elevation angle. Furthermore, the Cramér-Rao bound for target parameter estimation is derived. Parameter estimation performances are evaluated and studied theoretically and via simulations.