ABSTRACT
The Moon-Based SAR (MBSAR) is subject to orbital perturbation effects that differ significantly from those encountered in spaceborne SAR missions. To address such issues, this chapter offers a methodology based on the signal model to evaluate perturbation effects on the geometric fidelity and focusing quality in the MBSAR. Upon this foundation, the effects of lunar orbital precessions on the MBSAR imaging are investigated as exemplars of perturbation effects. Two major forms of precession within the lunar orbit, namely apsidal and nodal precessions, are considered. A quantitative analysis is conducted to evaluate the phase errors resulting from that orbital precession and its effects on the imaging performance of MBSAR. Afterward, criteria for orbital determination under orbital precession effects are established to maintain acceptable image quality in the MBSAR. Following the established criteria, the precision demands for orbital determination are explored. The findings suggest that the position and velocity determinations are most arduous along the z-axis direction.
