Mars probe secondary brake capture control method based on Newton iteration

Abstract

The invention provides a Mars probe secondary brake capture control method based on Newton iteration. During capturing and braking, after a Mars detector breaks down, an on-board computer is reset, then, the Mars probe is subjected to secondary braking by adopting a Newton iteration-based capturing and braking optimization method, so that the detector can smoothly enter a target orbit in the Marscapturing and braking process, and a secondary capturing and braking strategy can be autonomously designed for faults in the capturing and braking period. Besides, a safety zone for capturing and braking is also arranged and comprises the shortest ignition duration and the longest ignition duration of braking and capturing; when the on-board time is within the interval of the shortest ignition duration and the longest ignition duration, the speed increment reaches the nominal speed increment or the on-board time reaches the maximum ignition duration, the engine shutdown operation is executed,so that the Mars detector can form an annular fire track during braking and capturing and cannot impact Mars due to overlong ignition time, and the safety of Mars braking and capturing is guaranteed.

Description

technical field [0001] The invention relates to a Mars rover secondary brake capture control method based on Newton iteration, especially for target celestial body capture brake control, improving the safety of the capture brake process, and belongs to the technical field of extraterrestrial celestial body detection orbit control. Background technique [0002] For my country's autonomous Mars exploration in 2020, during the Mars capture and braking process, the orbit parameters of the probe change greatly, and it is necessary to realize the orbit transition of two different types of conic curves from the Mars hyperbolic orbit to the Mars elliptical orbit, such as figure 1 shown. The capture and braking of the Mars rover is a high-risk event. Due to the time delay of more than 20 minutes one way, the ground measurement and control cannot be measured and remotely controlled in real time, and there are also large speed increments of deceleration and braking, long braking time a...

AI Technical Summary

Problems solved by technology

The capture and braking of the Mars rover is a high-risk event. Due to the time delay of more than 20 minutes one way, the ground measurement and control cannot be measured and remotely controlled in real time, and there are also large speed increments of deceleration and braking, long braking time and poor orbit determination accuracy. and other unfavorable factors, and there have been many incidents of capture brake failure abroad

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