METHOD FOR CORRECTING THE ANGLES OF SIGHT TO A POINT Russian patent published in 2021 - IPC G01C15/00 

FIELD: land surveying.

SUBSTANCE: invention relates to the field of geodetic measurements, measurements of the trajectory of a point, when it is necessary to obtain angular directions to a point in a local (topocentric) horizontal coordinate system, where one of the planes is oriented horizontally. The method for correcting the angles of sight to a point provides for measuring the azimuth angle and elevation angle to the target and consists in the fact that in the measurement zone of the angle-measuring device, two reference points are additionally selected, which are well observed from the point of placement of the device and allow geodetic bindings to be made, the geodetic coordinates of the first and second reference points are measured. Then the angles of sight to the first and second reference points are measured, while the measured angles refer to the “skewed” coordinate system of the angle-measuring device, the angles of sight to the reference points are determined by the standard method for solving the inverse geodetic problem, during which, according to the known geodetic coordinates of two points, polar angles of sight are obtained from the first point to the second. At the same time, the viewing angles already belong to the local (topocentric) horizontal coordinate system and are accurate (reference). The Euler angles α₀, β₀, γ₀ are determined, then a standard matrix of angular corrections is formed, expressing three consecutive rotations by angles (-α₀, -β₀, -γ₀) and the converting “skewed” coordinate system of the measuring device into a topocentric horizontal coordinate system based on the found Euler angles α₀, β₀, γ₀ taken with opposite signs, the viewing angles obtained by the measuring device in its “skewed” coordinate system are recalculated. At the same time, as a result of this correction, the correct azimuth angle and elevation angle to the target of the local horizontal system are obtained for any point based on the coordinates measured by the angle meter in the “skewed” coordinate system of the azimuth angle and elevation angle of the target point.

EFFECT: increase in the accuracy of angular measurements in the horizontal coordinate system of a measuring device designed to measure the angles of the direction to the target.

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