Autonomous navigation method for libration point constellation

Abstract

The invention provides an autonomous navigation method for a libration point constellation. The method basically comprises the steps of firstly, constructing the state equation of a spacecraft based on the dynamic characteristic of the spacecraft at the libration point; secondly, observing a pulsar through a detector on a spacecraft in the constellation, calculating the included angle between the base line vector of the two spacecrafts and the absolute direction vector of the pulsar with the relative time delay of a pulse signal arriving at the two spacecrafts as the measurement quantity, and constructing a system observation equation on this basis; finally, processing a libration point dynamical model and observation information by means of the filtering algorithm, and obtaining the position information and velocity information of each spacecraft through time updating information and measurement updating information. The problem that autonomous positioning of a libration point constellation is hard to achieve currently is solved, and autonomous navigation and positioning of constellations are achieved through pulsar observation.

Description

technical field [0001] The invention relates to the field of aerospace technology, in particular to an autonomous navigation method for a translation point constellation. Background technique [0002] The translation point was first discovered by Euler and Lagrange in the restricted three-body problem. The vicinity of the sun-earth translation point is an ideal place to observe the universe and study astronomy; the Halo orbit and the Lissajous orbit near the collinear translation point are ideal positions for deep space probes performing special missions; the collinear unstable Rag Sun Point can become a space base and an interstellar navigation port. [0003] An X-ray pulsar is a rapidly rotating neutron star that is far from Earth and produces X-band electromagnetic radiation. The rotation period of X-ray pulsars is stable for a long time, and has extremely high long-term stability. It has been more than 30 years since Chester and Butman first formally proposed the idea...

AI Technical Summary

Problems solved by technology

[0005] The patent application with application number 200710005043.9 discloses an autonomous navigation system and method for navigation satellites based on X-ray pulsars. This method uses X-ray photons radiated by pulsars as external information input, and realizes by extracting pulse arrival time and angular position information. Constellation autonomous navigation, but this method does not use the pulsar-based relative measurement method, the spacecraft moves in a two-body environment, and does not realize the autonomous navigation of the translation point constellation

Images