Fault-tolerant guidance algorithms for Cassini´s Saturn orbit insertion burn

This paper describes a strategy which provides maximum assurance that Cassini´s Saturn orbit insertion (SOI) will be successful. First, the criticality of the SOI to the mission is shown and how it reduces to an energy only correction. Then, autonomous on-board diagnostic and response algorithms are described that respond to any combination of problems which might be encountered during the burn. An accurate restart algorithm is implemented to complete the energy correction if at all possible