GNSS-CCD-integrated zenith telescope high-precision vertical deflection fast measurement method

Abstract

The invention discloses a GNSS-CCD-integrated zenith telescope high-precision vertical deflection fast measurement method. At a measurement station, the optical axis of a zenith telescope faces to the zenith and takes a picture of a zenith zone so that a CCD fixed star image is obtained, fixed star image coordinates are calculated, exposure epoch is controlled by geodetic coordinates and a GNSS time signal measured by GNSS, fixed star information in the zenith zone is acquired in an appropriate star catalogue according to the measurement station vertical deflection calculated by an EGM2008 geopotential model, coupling identification of fixed stars in a zenith tangent plane zone of a celestial sphere in the star catalogue and in the CCD fixed star image is realized, zenith astronomical coordinates are calculated by least spuare iterative computation, and vertical deflection of the observed point is calculated according to geodetic coordinates. Compared with the prior art, the method provided by the invention has the characteristics of simple operation, time and labor saving and high measurement precision and is suitable for high-precision vertical deflection fast measurement.

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 ...

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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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