Method for designing earth-moon L2 point task launching window

Abstract

The invention discloses a method for designing an earth-moon L2 point task launching window. The method comprises the steps of obtaining window design constraint conditions, tracks, task important parameters and the like according to engineering constraints, task requirements and track design conditions; simultaneously carrying out constraint condition-related characteristic analysis on the transfer section and the mission section orbit, and respectively screening out launching window date sets meeting task requirements; and finally, solving a union set of the two to generate a complete nominal flight path under a corresponding date for confirmation, thereby obtaining a final launching window design result. The method can meet the multi-constraint requirements of engineering tasks on the launching window.

Description

technical field [0001] The invention relates to the technical field of orbit design for deep space exploration, in particular to a launch window design method for the Halo orbit mission of the L2 translation point of the Earth-Moon system. Background technique [0002] The translation point is the dynamic balance point between the gravitational resultant force and the third body's own inertial force when the third body is subjected to the universal gravitational force of two large celestial bodies. The L2 translation point of the Earth-Moon system is located on the extension line of the Earth-Moon line, and the Moon revolves around the Earth at the same revolution angular rate, and the spacecraft operating near this point can always run over the back of the Moon. Due to this special spatial geometry, the Earth-Moon L2 point has important application value in missions such as landing exploration missions on the far side of the moon and space science observations. At present,...

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Problems solved by technology

However, due to the special spatial geometric position and orbital configuration of the orbit near the Earth-Moon L2 point, the law of illumination and shadows is very different from that of the orbit around the Moon. correlation, but there is no analytical calculation formula available, nor significant periodicity, and the duration is much longer than the orbit around the moon, even up to tens of hours, which seriously threatens the safety of the spacecraft on orbit

However, in the Earth-Moon L2 point exploration missions that have been carried out before the Queqiao relay satellite, since they are all extended test missions, they do not involve launch constraints. Therefore, there is no precedent for the design method of the launch window of the Earth-Moon Equilibrium Mission.

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