Abstract
Traditional autonomous celestial navigation usually uses astronomical angle as measurement, which is a function of spacecraft’s position and can’t resolve the spacecraft’s velocity directly. To solve this problem, velocity measurement by stellar spectra shift is proposed in this paper. The autonomous celestial integrated navigation method is derived by combining velocity measurement with angle measurement, which can ensure the long-term high accuracy, real-time and continuous navigation performance for deep space exploration (DSE) missions. The observability of the integrated navigation system is analyzed. Moreover, the design of doppler navigator and hardware in-the-loop simulation system are described. Finally, a simulation example is employed to demonstration the feasibility and effectiveness of the proposed navigation algorithm.
Highlights
Compared with near-Earth missions, higher navigation performance is required by deep space exploration (DSE) missions for the complicated environment such as long flight distance, many unknown factors of the environment, complicated flight procedures, high communication delay and loss, tracking blind and celestial shelter, etc
The practicalities of hardware in-the-loop simulation system is shown as According to the functional design of the integrated navigation system, it can be divided into the following components: deep space dynamic environment output module, navigation image output module, navigation image acquisition module, angle navigation information extraction module, Sun/star spectrum output module, velocity measurement navigation information extraction module, integrated navigation filter estimation module, navigation performance evaluation and display module
An integrated navigation method based on stellar spectra shift velocity measurement is proposed
Summary
Compared with near-Earth missions, higher navigation performance is required by deep space exploration (DSE) missions for the complicated environment such as long flight distance, many unknown factors of the environment, complicated flight procedures, high communication delay and loss, tracking blind and celestial shelter, etc. In some special flight phases, such as closing, fly-around, landing, adhesion and increased rendezvous, the precise position and velocity information relative to the target objects are required, and the autonomous navigation and control method can perform better than ground measure in these DSE mission [6,7,8]. The traditional autonomous navigation methods mostly depend on angle measurement or ranging information to obtain the real-time estimation state of probe currently [9]. A practical guide is proposed to develop and realize an autonomous celestial navigation based on the spectrum velocity measurement technology in DSE, which can improve the velocity estimation accuracy of angle navigation and inhibit the divergence of position estimation of velocity navigation as well.
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