A three-pulse Earth-Moon l2-point halo orbit capture method

Abstract

The invention provides a capturing method of a three-pulse earth-moon L2 point Halo orbit. The capturing method comprises the specific processes: firstly, the perilune pulse entering an earth-moon L2point Lissajous orbit is calculated according to characteristics of the orbit; then positions of two-time pulse capturing and the Halo entry point positions are given, the first-time captured pulse ofthe Halo orbit is solved by a method for correcting the initial state through a state transition matrix, and the second-time captured pulse is obtained by subtracting the speed of the orbit when operating to the second-time capturing position from the speed needed by the Halo orbit on the second-time capturing position; and finally, according to the engineering constraint, the positions of two-time pulse capturing are adjusted, two times of pulsed quantities needed by entering of the Halo orbit from different phase points are calculated, and a strategy with the minimum sum of the pulses of three times is selected. The strategy optimizes a Halo orbit capturing strategy through the three pulses, the multi-constraint demand in engineering is met, the speed increment is decreased, and the application range is wide.

Description

technical field [0001] The invention belongs to the technical field of orbit design for deep space exploration, and in particular relates to a method for capturing the Halo orbit at the L2 point of the three-pulse Earth-Moon point. Background technique [0002] In the exploration mission of landing on the back of the moon, since the moon is always facing the earth, the probe cannot directly communicate with the ground, and a relay satellite is needed as a communication bridge between the two. There are two orbit schemes available for relay satellites: circumlunar orbit and Earth-Moon L2 point orbit. The near-month braking speed increment of the orbit around the moon is generally greater than 250m / s, and due to the influence of the moon's occlusion, the continuous visibility of the moon's back cannot be realized. The Halo orbit scheme at the Earth-Moon L2 point has a brake speed increment of about 200m / s in recent months, which can ensure continuous communication with the ba...

AI Technical Summary

Problems solved by technology

The near-month braking speed increment of the orbit around the moon is generally greater than 250m / s, and due to the influence of the moon's occlusion, it is impossible to achieve continuous visibility on the back of the moon

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