Acceleration control-aided APDG law for powered descent landing in atmospheric conditions

Apollo powered descent guidance (APDG) law enabled lunar module to land on the Moon successfully. Since then, in past 50 years, APDG and several of its variants have been used numerous planetary landing studies missions. As formulation does not consider drag force, is typically for rarefied environments like Mars. In this paper, we extend application atmospheric by aiding it with an acceleration controller. The proposed control strategy only compensates estimated aerodynamic drag, but also mitigates uncertainties thrust produced, thus maintaining desired acceleration. To demonstrate efficacy, provide results simulated a reusable launch vehicle (RLV) Earth using along law.