Linear Covariance Analysis for Powered Lunar Descent and Landing

摘要

A baseline sensor suite consisting of a star camera, an altimeter, gyros, accelerometers, and a velocimeter isnexamined for the powered lunar descent landing problem using linear covariance techniques. The inertial navigationnerror during lunar powered descent and landing is determined, and the sensitivities to initial navigation errors,ngravity model errors, and individual instrument errors are evaluated. Terrain-relative navigation sensors arenintroduced into the analysis, and a novel application of linear covariance analysis is used to iteratively determine thensensor specifications needed to meet a 100 m 3-u0001 landing-error requirement. The sensitivities of landing navigationnerror to sensor errors, environment modeling errors, and terrain map errors are determined.