A vertical line deviation measurement device and method integrating gnss and laser tracker

Abstract

The invention discloses a plumb line deflection measuring device with an integrated GNSS (Global Navigation Satellite System) and laser tracker and a method. The plumb line deflection measuring devicecomprises a base, a cylinder, a free falling body target ball, a plurality of fixed target balls, a laser tracker and a plurality of GNSS receivers. The plumb line deflection measuring method comprises the following steps: s1, well placing the plumb line deflection measuring device, and vacuuming the interior of the cylinder; s2, acquiring a coordinate of a testing point P in an earth-fixed coordinate system and conversion parameters of a body-fixed coordinate system and the earth-fixed coordinate system by using a GNSS receiver of which the coordinate of the body-fixed coordinate system is known; s3, acquiring conversion parameters and gravity direction vectors of an independent coordinate system and the body-fixed coordinate system by using the laser tracker; s4, calculating an astrogeodetic plumb line deflection and factions of a meridian and a prime vertical circle of the testing point P; s5, calculating a gravity deflection and factions of the meridian and the prime vertical circle of the testing point P. By adopting the device, high-precision plumb line deflections of testing points can be efficiently and rapidly measured, and the device has the advantages of high measurement efficiency, reliable measurement results, high measurement precision, and the like.

Description

technical field [0001] The invention relates to a vertical line deviation measuring device and method integrating GNSS and laser tracker. Background technique [0002] Gravity direction vector g at a point on the ground di The included angle u with the normal vector p on the corresponding ellipsoid is the vertical deviation of the point, which represents the inclination of the geoid. U is usually represented by the meridian component ξ (the component in the north-south direction) and the unitary circle component η (the component in the east-west direction). Obviously, according to the different ellipsoids used, it can be divided into absolute vertical deviation and relative vertical deviation. The angle formed by the vertical line and the normal of the total earth ellipsoid (or reference ellipsoid) is called the absolute (or relative) vertical deviation , they are collectively referred to as astronomical geodetic vertical deviations. In addition, the gravitational directi...

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Problems solved by technology

[0007] However, the first three of the above four methods all have the disadvantages of heavy workload and low measurement efficiency; the GPS leveling method must use leveling technology to measure the vertical line deviation in order to obtain the difference of the geoid gap or the abnormal difference of the elevation. Generally, it will be combined with a precision level, but due to the constraints of the accuracy of the instrument itself and external conditions, the measurement accuracy of geodetic height difference and level difference is not high

The high-precision measurement instruments for vertical deviation mainly include astronomical theodolite and digital zenith camera. The measurement principle is astronomical geodesy. Although the measurement accuracy is high, it is restricted by the measurement environment and can only be carried out on clear nights. Observation, and there can be no influence of background light, so the measurement effect of astronomical theodolite and digital zenith camera is poor in crowded areas with strong background light

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