Reentry guidance for hypersonic vehicle based on predictor-corrector method

An energy-based predictor-corrector guidance algorithm was proposed to handle the need for high precision and robustness of reentry guidance for hypersonic vehicle. A detailed derivation of three degrees of freedom reentry kinematic equations based on energy was conducted, and the path constraints and terminal constraints were also included. Based on the derivation, the longitudinal and lateral guidance law was designed. For the longitudinal part, longitudinal range errors were repeatedly calculated, and a fuzzy corrector was designed to eliminate the errors which guarantee the accuracy of the longitudinal guidance; for the lateral guidance law, a cross-range error based lateral reversal logic was designed, whenever the cross-range exceeds the sited boundaries, a bank reversal was conducted. Simulation results on both standard and deviation conditions verified the effectiveness of the proposed guidance law.