Abstract
Based on the theory of atmospheric refraction, combined with the atmospheric parameter data of NCEP (National Centers for environmental prediction), the Fourier interpolation fitting algorithm is used to model and analyze the parameters affecting atmospheric refraction on a global scale. The atmospheric temperature and density model with space-time variation is constructed. The spacecraft state equation and the measurement equation with the starlight apparent height as the observation quantity are established. Moreover, the Unscented Kalman filter is applied to the indirect sensitive horizon autonomous astronomical navigation of starlight refraction. The relative error of fitting the measured data with the spatiotemporal atmospheric temperature model established in this paper is less than 2%. The position estimation error of the navigation system is 94 m, and the velocity estimation error is 0.16 m/s. Compared with the traditional model, the navigation and positioning considering complex atmospheric changes are more accurate.
Highlights
Astronautical navigation is a positioning navigation method that uses the information of objects measured by optical sensors to calculate the position of the carrier
Erefore, based on NCEP global atmospheric parameter data, this paper establishes an atmospheric parameter model considering time and space changes using the Fourier interpolation algorithm, studies the changes of atmospheric density with latitude, modifies the traditional atmospheric parameter model combined with the characteristics of star light transmission in the atmosphere, and uses unscented Kalman filter for indirectly sensitive horizon autonomous astronomical navigation of star light refraction
In the astronomical navigation of starlight refraction indirectly sensitive horizon, the refraction apparent height hais usually selected as the observation measurement, but there is no direct relationship between the apparent height haand the refractive angle R. e apparent height needs to be obtained indirectly through the relationship between the refractive height hgand R. erefore, equation (4) is transformed into the measurement equation by adding the Gaussian measurement noise v
Summary
Astronautical navigation is a positioning navigation method that uses the information of objects (moon, sun, other planets, and stars) measured by optical sensors to calculate the position of the carrier. Astronomical navigation has become the most effective autonomous navigation method for spacecraft because of its high navigation accuracy, no error accumulation with time, strong anti-interference ability, and the ability to provide position and attitude information at the same time [3]. In 2013, Ning et al analyzed the atmospheric environment when they studied the method of autonomous astronomical navigation of the Earth’s direct sensitive horizon. Erefore, based on NCEP global atmospheric parameter data, this paper establishes an atmospheric parameter model considering time and space changes using the Fourier interpolation algorithm, studies the changes of atmospheric density with latitude, modifies the traditional atmospheric parameter model combined with the characteristics of star light transmission in the atmosphere, and uses unscented Kalman filter for indirectly sensitive horizon autonomous astronomical navigation of star light refraction
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