Quick and autonomous orientation method of photoelectric theodolite

Abstract

The invention discloses a quick and autonomous orientation method of a photoelectric theodolite and belongs to the technical field of celestial navigation. The method comprises the following steps of: shooting a star map through the photoelectric theodolite, and identifying at least three fixed stars in a view field by using a star map identification algorithm; adjusting the photoelectric theodolite to ensure that the image of one identified fixed star is formed on a visual axis of the photoelectric theodolite, and computing the view position of the fixed star at this time; computing a theoretical azimuth angle and a theoretical angular altitude of the fixed star relative to the true north by combining an astronomical coordinate of the photoelectric theodolite; selecting other fixed stars to obtain a coder average value of the true north; and introducing the photoelectric theodolite to the measured true north direction, and clearing a direction encoder to finish quick and autonomous orientation of the photoelectric theodolite. The method is high in precision and high in speed, and the advantages of the photoelectric theodolite are realized. By the means of star map identification, the photoelectric theodolite can orient autonomously without initial direction, so that the limit of only observing the Polaris in the conventional astronomical orientation method is broken through, and the photoelectric theodolite can orient in any directions by virtue of any fixed stars.

Description

technical field [0001] The invention belongs to the technical field of astronomical navigation, and in particular relates to a method for fast and autonomous orientation of a photoelectric theodolite. Background technique [0002] The photoelectric theodolite is a photoelectric telescope used for precise angle measurement, which integrates tracking, ballistic measurement and target attitude measurement. It is an important optical measurement equipment in the shooting range. Before the equipment is used, preparations such as calibration and orientation are required to establish a unified azimuth reference, otherwise it will cause confusion and future work cannot be completed normally. [0003] The azimuth reference usually chooses the north direction as the zero direction of the azimuth, and the north direction has three different north direction lines: true north, magnetic north and coordinate north. Generally, true north is used as the standard direction, which can be measu...

AI Technical Summary

Problems solved by technology

[0011] This method has certain limitations, such as large errors in observations in high-latitude areas, and difficult observations in low-latitude areas will make orientation impossible

[0012] The current orientation method of the photoelectric theodolite is to arrange 3~5 azimuth markers evenly around the station, and use the azimuth markers to complete the calibration of the zero direction of the azimuth before use, but this method requires additional measurement and cost

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