Observation condition number-based method for selecting autonomously located road sign of deep space probe

Abstract

The invention relates to an observation condition number-based method for selecting an autonomously located road sign of a deep space probe, which is particularly applicable to an autonomously location determining system for a dual-road-sign detector, belonging to the field of autonomous navigation. By calculating and comparing the number of observation matrix conditions, the method can construct the position of the detector in a target celestial fixedly connected coordinate system by selecting two road signs, ensures the precision of determining the detector position can be greatly improved, and provides an accurate and practical located road sign autonomously selecting method for the deep space probe in low-earth orbit flight. The method not only considers the impact of the road sign position to navigation precision, but also has the characteristics of small calculation, practical analysis and the like.

Description

technical field [0001] The invention relates to a method for selecting landmarks for autonomous positioning of deep-space detectors based on observation condition numbers, which is particularly suitable for a detector autonomous location determination system with two landmarks, and belongs to the field of autonomous navigation. Background technique [0002] The near-target celestial body flight stage is the core stage of deep space exploration missions, and the main scientific investigation tasks will be completed in this stage. Therefore, high detector orbit determination accuracy is required to facilitate the collection and processing of scientific observation data. Due to the uncertainty of dynamic parameters such as the spin state of the target celestial body, the gravitational field model, and the existence of unmodeled interference forces, the navigation method adopted by the detector must have strong robustness. At the same time, deep space target celestial bodies are...

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Problems solved by technology

[0007] In order to solve the problem that the current deep space detectors based on landmark navigation do not have an accurate and feasible method for autonomously selecting positioning landmarks, the present invention proposes an autonomous deep space detector for a navigation system that uses dual landmark information to determine the position of deep space detectors. Positioning landmark selection method, this method is mainly based on the condition number of the observation equation to achieve

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