Multi-star map fused astronomical positioning method

Abstract

The invention belongs to the technical field of astronomical navigation, and relates to a multi-star map fused astronomical positioning method. Experimental verification depends on a digital zenith instrument, and a hardware system of the digital zenith instrument comprises an optical imaging system, a high-precision inclinometer and a precision leveling device. The software system comprises starmap processing, zenith instrument positioning calculation and inclination angle compensation. The method is characterized by comprising three steps of fixed star image point track model construction,multi-star map fusion and fused star map positioning. Compared with the prior art, by adopting the method for positioning, when regional star point missing exists in a small number of star maps due tothe fact that star map shooting is affected by external uncertain factors, it can be guaranteed that the digital zenith instrument has high positioning precision through multi-star map fusion.

Description

technical field [0001] The invention belongs to the technical field of astronomical navigation, and relates to an astronomical positioning method for multi-star map fusion. Background technique [0002] The digital zenith instrument is developed from the analog zenith instrument. Its biggest feature is that it can accurately measure the astronomical position of the station. It is widely used in the field of geodesy and celestial navigation. Precision inclinometer, CCD sensitive components, etc. The University of Hannover in Germany first developed a portable zenith system, and then research institutes such as the Zurich Institute of Technology in Switzerland carried out related research one after another. Compared with foreign countries, domestic scientific research institutes are late in research on digital zenith instruments, but the development speed is relatively fast, which is mainly due to the substantial improvement in the industry's software and hardware levels. Th...

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Problems solved by technology

However, the astronomical positioning method of the above-mentioned digital zenith instrument still has certain deficiencies in the positioning calculation. Due to the influence of factors such as the observation environment during shooting, there are regional star points missing in a small number of star maps. Making related corrections will lead to a decrease in the final positioning accuracy, which cannot meet the precise positioning requirements of the digital zenith instrument. Therefore, a multi-star map fusion astronomical positioning method is proposed

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