Deep space probe angle measurement and time delay integrated navigation method based on on-line estimation

Abstract

The invention provides a deep space probe angle measurement and time delay integrated navigation method based on on-line estimation, and the method comprises the steps: estimating the current positionand speed information of a probe and a reflection celestial body according to the orbit dynamics, and building a system state model through employing the current position and speed information as a system state quantity; obtaining starlight angular distance measurement between the detector and the reflection celestial body as well as between the detector and the background fixed star by using anangle measurement sensor, and establishing a starlight angular distance measurement model; respectively observing the direct sunlight and the reflected sunlight reflected by the reflection celestial body by using two atom frequency discriminators so as to obtain time delay measurement, and establishing a time delay measurement model; obtaining state estimation and error covariance estimation through implicit unscented Kalman filtering, correcting the actual position and speed information of the reflection celestial body, then obtaining the actual position and speed information of the detector,and achieving detector navigation. The influence of the ephemeris error of the reflection celestial body on the navigation precision is inhibited, and the autonomous navigation precision of the detector is improved.

Description

technical field [0001] The invention belongs to the technical field of autonomous navigation of deep space probes, and in particular relates to an angle measurement and delay combined navigation method for deep space probes based on online estimation. Background technique [0002] 2020 will usher in the best time window for launching the Mars probe. At present, five countries including the United States have announced the "Fire Detection Program". my country also plans to launch the "Mars One" probe to carry out my country's first planetary exploration activities. . For planetary exploration missions, navigation accuracy has a very important impact on the success or failure of the mission. At present, the ground measurement and control station mainly provides navigation information for the detector, but as the distance between the detector and the earth increases, the two-way time delay of signal transmission through the ground measurement and control station will become lar...

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Problems solved by technology

[0004] However, there are inevitably errors in the celestial ephemeris. The above methods do not consider the influence of the reflected celestial ephemeris error on the navigation results. The ephemeris error will lead to deviations in the measurement of starlight angular distance and time delay, and reduce navigation accuracy

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