Independent celestial navigation method of deep space probe based on minor planet intersection

Abstract

The invention relates to an independent celestial navigation method of a deep space probe based on minor planet intersection. The method comprises the following steps of: establishing a state model of the deep space probe according to a circular restrictive track dynamics model; acquiring picture element and picture line information of minor planets and a background fixed star by using a sensor, converting the acquired picture element and picture line information into angle information of the minor planets and the background fixed star and establishing an angle measuring model of the minor planets; and estimating the position and speed of the deep space probe in combination with self-adaptive Unscented Kallman filtering. The method has high estimation accuracy, and is very suitable for independent navigation during minor planet intersection. The method belongs to the technical field of aerospace navigation. By adopting the method, high-accuracy navigation parameters can be provided for the deep space probe, and references can be provided for the design of an independent navigation system of the deep space probe.

Description

technical field [0001] The invention relates to an autonomous astronomical navigation method based on asteroid angle information during the rendezvous stage between a deep-space probe and an asteroid, and is an autonomous navigation method very suitable for a deep-space probe in the rendezvous period with an asteroid. Background technique [0002] In the solar system, more than 140,000 asteroids gather between the orbits of Mars and Jupiter, and some asteroids orbit between the orbits of the Earth and Mars, becoming near-Earth asteroids. Small celestial bodies such as asteroids and comets retain a lot of information about the early days of the solar system, and are important evidence for the study of the origin and evolution of the solar system; by looking for evidence of the existence of water and organic matter on asteroids, it is helpful to understand the origin and origin of life in the earth and the solar system. evolution. In recent years, more and more attention has ...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved in the present invention is: to overcome the distance between the sun and planets and their satellites and pulsars to the detector based on the self-navigation method of the sun and the planets and their satellites and pulsars, or the number of navigation pulsars is small, the precision is low, and the detection is difficult. It makes up for the shortcomings of traditionally observing asteroid pixel image line measurement information that is constrained by the attitude of the detector, and solves the problem that the system cannot provide accurate data for existing suboptimal nonlinear estimation methods such as Unscented Kalman filtering. The error distribution characteristics of the state model and measurement model and the prior information of the state quantity provide a high-precision autonomous celestial navigation method for deep space probes in the rendezvous with asteroids

Images