Abstract:

The missile location using synthetic aperture radar (SAR) for scene matching midcourse guidance is studied. Partial aperture imaging is an effective imaging mode of SAR for scene matching midcourse guidance. A focused Doppler beam sharpening imaging method is proposed for the convenience of multi-matched point location. A missile location model is established based on range differences and Doppler differences of matched points, which also takes the errors of altitude, velocity and targets position into account. The CramerRao lower bound (CRLB) is derived for the location model. A closed-form solution algorithm is proposed that employs the weighted least square minimization only and is not iterative. It is shown analytically, under some approximations, to achieve the CRLB accuracy. The error’s effect on the CRLB is analyzed by simulations, and simulations also corroborate the theoretical results and the good performance of the algorithm.