Optimal Bi-ISAR Imaging Arc Selection Method with Bistatic Angle Derivative Constraint

Bistatic inverse synthetic aperture radar (Bi-ISAR) imaging has a broad application in space surveillance and missile defense. However, the imaging quality for bistatic ISAR is closely related to the choice of the imaging arc. Aiming at the need of high resolution imaging of aerial moving targets, an optimal Bi-ISAR imaging arc selection method with bistatic angle derivative constraint is proposed. Firstly, the Bi-ISAR imaging model of moving target is constructed, and the expression of bistatic slant range history related to the bistatic angle derivative is derived. Then, the boundary of the Bi-ISAR imaging performance is theoretically analyzed from the dimensions of range cell migration (RCM) and azimuth-quadratic phase (AQP), and the corresponding constraints are figured out. Finally, based on the minimum fusion criterion, the optimal Bi-ISAR imaging arc are selected. The processing results of both simulation data and measured data verify the effectiveness of the proposed method.