A fast measurement method for high-precision vertical line deviation integrated with gnss and ccd zenith

Abstract

The invention discloses a high-precision vertical line deviation rapid measurement method integrating GNSS and CCD zenith tube, which shoots the zenith area by making the optical axis of the zenith tube point to the zenith direction at the station to obtain CCD Stellar images, and the image coordinates of the stars are calculated, the exposure epoch is controlled by the geodetic coordinates measured by GNSS and the GNSS time signal, combined with the vertical line deviation of the station calculated by the EGM2008 gravity field model, the zenith is obtained in the applicable star catalog Regional star information, realize the matching and identification of stars in the zenith tangent plane area of ​​​​the celestial sphere in the star catalog and stars in the CCD star image, use the least square method to iteratively calculate the zenith astronomical coordinates, and combine the geodetic coordinates to calculate the vertical line deviation of the observation point. Compared with the prior art, the present invention has the advantages of simple operation, time-saving and labor-saving, and high measurement accuracy, and is suitable for rapid measurement of high-precision vertical line deviation.

Description

technical field [0001] The invention relates to an astronomical geodetic measurement method for vertical line deviation, in particular to a high-precision vertical line deviation rapid measurement method integrating GNSS and CCD zenith tube. Background technique [0002] The angle between the gravity vector g of a point on the ground and the normal vector n on the corresponding ellipsoid is defined as the vertical deviation of the point. The vertical line deviation represents the direction of gravity, and is a necessary geophysical quantity for geodetic reduction, the refinement of the earth's gravity field and geoid model, and the study of the shape of the earth. It has important uses in geodetic surveying and space technology. [0003] The vertical deviation is the performance of the mass distribution inside the earth, which can be used to invert the abnormal refraction of the atmosphere, monitor the mass migration and energy accumulation inside the earth, monitor natural ...

AI Technical Summary

Problems solved by technology

However, the above-mentioned methods generally have shortcomings or deficiencies such as complex basic data collection process, or cannot be effectively obtained at all, cumbersome and complicated post-data processing process, time-consuming and labor-intensive, etc.:

[0012] However, there are limitations in the use of this method. For example, it is too difficult to carry out precise leveling in some areas with large terrain fluctuations, and the baseline cannot be too long. The accuracy of the vertical line deviation calculated by it is low

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