Survey of planetary entry guidance algorithms

This comprehensive literature survey reviews past and present planetary entry guidance algorithms. The algorithms are categorized based on the vehicle L/D and the planetary atmosphere that the vehicle is entering. Each algorithm is described based on the guidance type, the guidance formulation, and the inclusion of aerothermal parameters. An analysis was completed defining the performance of each guidance algorithm relative to one another within its specific category. Finally, an overall assessment was made regarding the state-of-the-art in spacecraft entry guidance.