Method for determining distance between lander and lunar surface in consideration of three-dimensional terrain in lunar landing simulation process under power

Abstract

The invention discloses a method for determining a distance between a lander and a lunar surface considering three-dimensional terrain in a lunar landing simulation process under power. The method comprises the following steps: acquiring lunar surface three-dimensional terrain data near a target landing area of the lander; determining a track change envelope in the landing month process under thepower according to the deviation caused in the landing month process under the power of the lander engine; intercepting target landing area topographic data enveloped and covered by flight path changefrom the acquired lunar surface three-dimensional topographic data near the target landing area of the lander; defining a terrain file format, and generating a binary terrain file for downloading according to the intercepted target landing area terrain data enveloped and covered by the track change; downloading the binary terrain file into a ground simulation computer; and the ground simulation computer is used for obtaining the distance relative to the lunar surface in the lunar landing process under the lander power considering the lunar surface topography according to the binary topographyfile and the three-dimensional topography search mode. According to the method, the safety and effectiveness of lunar back power reduction guidance can be verified.

Description

technical field [0001] The method for determining the distance of the lander relative to the lunar surface in consideration of the three-dimensional terrain during the simulation process of the powered landing of the present invention can be applied to the real-time simulation verification based on the three-dimensional terrain during the landing process of Chang'e-4, Chang'e-5 and Mars. Background technique [0002] During the power descent of the lunar soft landing, the real-time position and velocity can be calculated by the inertial navigation, but the calculation results of the inertial navigation will drift and error with time, so it is necessary to use the distance data of the ranging sensor to correct the inertial navigation error. Commonly used ranging sensors include laser ranging sensors and microwave ranging sensors. No matter which system of ranging sensor is used, its measurement output will be directly affected by the lunar surface terrain, which will affect ...

AI Technical Summary

Problems solved by technology

[0005] (1) The three-dimensional terrain data of the lunar surface contains the three-dimensional terrain data of the entire lunar surface. The file data volume is large, usually above the GB level, and cannot be directly used for terrain search;

[0006] (2) There is no unified standard interface between the three-dimensional lunar surface terrain file and the simulation computer, and it is impossible to effectively import the three-dimensional lunar surface terrain file into the simulation computer;

[0007] (3) The traditional 3D terrain search method consumes a lot of time. For the simulation system, its real-time requirements are very high. The traditional 3D terrain search method cannot meet the real-time requirements of the simulation.

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