An Anti-disturbance Guidance Method for Precise Planetary Landing

Abstract

The invention discloses an anti-disturbance guidance method for precision landing of a planet, relates to a guidance method for the precision landing of the planet and belongs to the technical field of deep-space detection. A non-linear model predication control method capable of directly treating non-linear and non-convex constraints is introduced in a plant descending process; a precision landing track optimization problem of the planet is only calculated on a limited-dimension rolling time domain and the calculation amount and the solving difficulty are reduced; online generation of a precision landing guidance rule of the planet and an optimal track is realized; meanwhile, external disturbance in the descending process is considered, real-time estimation is carried out on the external disturbance by adopting an expansion state observer and correcting control quantity, so as to realize disturbance compensation and inhibition and improve the safety of a landing task. The anti-disturbance guidance method has the following two advantages that (1) the calculation amount and solving difficulty of the precision landing track optimization problem of the planet can be reduced and the online generation of the optimal track is realized; (2) influences, caused by the external disturbance, on a system are reduced and the safety of the landing task is improved.

Description

technical field [0001] The invention relates to a planetary precision landing guidance method, in particular to a planetary precision landing anti-disturbance guidance method, which belongs to the technical field of deep space exploration. Background technique [0002] In order to obtain higher scientific returns in planetary exploration missions, future deep space missions require probes to reach more complex terrain surfaces than before, which puts high demands on landing accuracy. However, uncertain factors such as environmental disturbances during the descent may cause the probe to deviate from the nominal trajectory, resulting in unpredictable and serious consequences, thus endangering the safety of the entire landing mission. In order to eliminate the influence of these unfavorable factors, it is necessary to take external disturbances into consideration during the mission design process, and generate corresponding guidance instructions online to guide the probe to lan...

AI Technical Summary

Problems solved by technology

At present, limited by the computing and storage capabilities of the spaceborne computer, the trajectory optimization algorithms that can perform online real-time calculations are very limited, and the requirements for the form of constraints are also very strict, making it difficult to guarantee the optimality of the trajectory generated online, and when the external environment changes , the system cannot make adjustments in time, affecting the normal descent process

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