Patent ID: 9671789
Date: 2017-06-06
CPC Classifications: B64G

Claim:
1. A method for anti-interference compound on-line guidance in the atmosphere-entering stage of a Mars lander, comprising the following 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, wherein, the dynamics model for the atmosphere-entering stage of the Mars lander is expressed as: in which, d and d in which C D is a drag coefficient, a lift acceleration L is expressed as: in which C L is a lift coefficient, and in the expressions of the drag acceleration D and lift acceleration L, S is a reference surface area of the Mars lander, m is a mass of the Mars lander, and ρ is a Mars atmosphere density; the Mars atmosphere density is specifically expressed as: ρ=ρ 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 through the anti-disturbance composite guidance law so as to control the landing attitude of the Mars lander system.