Power reduction initial point parameter optimization method based on terrain of moon surface

Abstract

The invention provides a power reduction initial point parameter optimization method based on terrain of moon surface, The method particularly comprises the following steps: a first step, setting a moon latitude and a selenocentric distance of a power reduction initial point, wherein RL is an average moon radius in a certain local area where range finding is introduced; a second step, in a period between near-moon braking and around-moon rail reducing, optimizing the moon latitude and the selenocentric distance of the power reduction initial point, and introducing the optimized result into a third step; and the third step, in the period between around-moon rail reducing and power reduction, if a fact that the selenocentric distance error or / and moon latitude deviation are larger than allowable envelope in design, optimizing the moon latitude and the selenocentric distance of the power reduction initial point according to the manner of the second step until the moon latitude and the selenocentric distance of the power reduction initial point are set in the allowable envelope in design, and hereon utilizing the optimized moon latitude and the selenocentric distance of the power reduction initial point as initial parameter of a power reduction period. The initial parameter determined by the method can ensure a detector to safely fall into a preset target area in soft landing process.

Description

technical field [0001] The invention relates to the technical field of lunar exploration, in particular to a parameter optimization method for the initial point of power descent based on lunar surface topography. Background technique [0002] The current lunar soft landing exploration mission, from the flight procedure, is that the probe first enters the circular orbit around the moon after the braking of the last month, and the orbit height is usually 100km-200km. The elliptical orbit at an altitude of about 15km at the moon point also runs for a certain period and then begins to power down at an altitude of about 15km at the near moon point until it softly lands on the lunar surface. [0003] Due to the ups and downs on the surface of the moon, the lunar center distance varies greatly during the soft landing process. Taking the Hongwan and Imbrium areas as examples, the terrain elevation gradually decreases from south to north, and the difference between the highest point ...

AI Technical Summary

Problems solved by technology

[0007] Due to the overload and large changes in attitude during power descent, it usually only depends on battery discharge, and there is a risk in power balance; at the same time, the engine is continuously ignited for a long time, facing the dual effects of the engine's thermal environment and the infrared heat flow of the lunar surface, the thermal design can only rely on thermal Tolerance adaptation, all of which require the time of power descent process to be controlled within a certain range

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