High-precision Earth-Moon Free Return Orbit Design Method

Abstract

The invention provides a high precision earth-moon free return track design method, which comprises the steps of setting a track parameter of a free return track near- earth parking track before track transferring; selecting variable controlled variable; fixing speed increment of a spacecraft and earth-moon flight time, and adjusting right ascension of ascending node and a perigee argument of the near-earth parking track; simulating track of the earth-moon transfer segment, namely adjusting the speed increment, the track inclination angle, the right ascension of ascending node and the perigee argument in an integral way for the first time; simulating track of the earth-moon and the moon-earth transfer segment, namely adjusting the speed increment, the track inclination angle, the right ascension of ascending node, the perigee argument and flight time in the earth-moon / moon-earth transfer segment in an integral way for the second time; and simulating track of the earth-moon and moon-earth transfer segment to obtain an accurate free return track parameter. Therefore, by designing the free return track search flow reasonably, the initial track parameter of the free return track can be determined gradually, and a design personnel can design the free return track directly and accurately.

Description

technical field [0001] The invention relates to a high-precision earth-moon free-return orbit design method, and more specifically, relates to a free-return orbit design scheme during the earth-moon transfer process of a manned lunar landing spacecraft. Background technique [0002] The free return orbit around the moon refers to a special earth-moon transfer orbit in which the spacecraft does not perform orbit-changing maneuvers after reaching the near-moon point, but can automatically return to the earth after flying through the moon. In manned missions to the moon, from the perspective of ensuring the safety of astronauts, the Earth-Moon transfer orbit is generally designed as a free return orbit. When a system (for example, the propulsion system) of the manned lunar landing spacecraft fails during the earth-moon transfer process, the mission to the moon can be abandoned and directly return to the earth without any adjustments, which greatly guarantees the safety of the a...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that due to the neglect of other perturbing forces, there is a certain error between the free-return simplified orbit and the free-return accurate orbit obtained by it, and further precise orbit design is required, and the steps are relatively cumbersome

However, if the precise orbit design of the free return orbit is carried out directly, the search time will be increased due to the large error between the given initial conditions and the correct solution of the initial orbit parameters, and even divergence will occur.

Images