Method and system for anti-disturbance composite on-line guidance for atmosphere-entering phase of a Mars lander

US9671789B1 · kind B1 · utility

Assignee

• Beihang University · CN

Inventors

• Lei Guo · Williamsburg, US
• Jianwei Xu · Nanhu, CN
• Jianzhong Qiao · Beijing, CN
• Peixi Zhang · Beijing, CN

Key dates

• Filing date: Dec 7, 2016
• Grant date: Jun 6, 2017
• Expiry date: Dec 7, 2036

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B64G1/245
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method and system for anti-interference compound on-line guidance in the atmosphere-entering stage of a Mars lander is provided in the present invention. The method comprises steps of a) building a dynamics model for the atmosphere-entering phase of a Mars lander to incorporating the disturbance brought by the Mars atmosphere density uncertainty into the dynamics model for the atmosphere-entering stage of the Mars lander; b) constructing a disturbance observer to estimate the disturbance brought by the Mars atmosphere density uncertainty in the dynamics model for the atmosphere-entering phase of the Mars lander; c) building a prediction-correction guidance law, and guiding the heeling angle amplitude of the prediction-correction guidance law by continuously updating undetermined parameters; d) constructing an anti-disturbance composite guidance law to compensate the Mars atmosphere density uncertainty; and e) adjusting the deviation of the landing point of the Mars lander by compensating the Mars atmosphere uncertainty disturbance.