Astronomical Doppler differential velocity measurement method based on planetary spectral reflectivity template inversion

Abstract

The invention provides an astronomical Doppler differential velocity measurement method based on planetary spectral reflectance template inversion, and the method comprises the steps: carrying out the inversion and actual measurement of a planetary spectral reflectance template through IMF obtained through EMD, and achieving the optimal combination of IMF through GGA optimization, so as to improve the astronomical spectral velocity measurement precision; the implementation method comprises the following steps: fitting to obtain a high-precision sun and planet reference speed difference according to input celestial body radial speed and observation time, and decomposing an actually-measured solar spectrum and an actually-measured planet spectrum by utilizing EMD to obtain an IMF; screening IMF to construct an initial reflectivity template, and forming a virtual planetary spectrum; calculating a speed difference estimation value, and taking a difference value between the speed difference estimation value and a reference speed difference as an error; gGA is adopted to realize combination optimization of IMF, and an optimal planetary spectral reflectance template is searched; the virtual planetary spectrum is obtained through the optimal planetary spectrum reflectivity template, the estimation precision between the actually-measured solar spectrum and the actually-measured planetary spectrum is improved, high-precision astronomical spectrum speed measurement is achieved, and astronomical Doppler differential navigation performance is improved.

Description

technical field [0001] The invention belongs to the technical field of astronomical signal processing, in particular to an astronomical Doppler differential navigation based planetary spectral reflectance template reflection based on EMD-GGA (Empirical Mode Decomposition-Gaussian Genetic Algorithm, Empirical Mode Decomposition-Gaussian Genetic Algorithm) Acting method. Background technique [0002] In recent years, major aerospace countries have set off an upsurge in deep space exploration. In 2020 alone, humans have launched three Mars probes to Mars, including the US Perseverance, the UAE's Hope, and China's Tianwen-1. Three Mars probes have successfully arrived on Mars. Navigation is one of the key technologies in deep space exploration, which directly affects the success or failure of missions. Celestial navigation does not rely on ground stations, and it is the development direction of autonomous navigation for deep space exploration in the future, with great potenti...

AI Technical Summary

Problems solved by technology

Affected by planetary reflectivity and solar activity, in addition to the phase of the measured planetary spectrum and the measured solar spectrum, the spectral profile will also be distorted, which will affect the Doppler velocity difference between the measured solar spectrum and the measured planetary spectrum. Puller differential navigation has a greater impact

In practical applications, the astronomical spectral velocity estimation for the same light source has certain limitations

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