Resolving method of rotating shaft of digital zenith instrument

Abstract

The invention belongs to the technical field of geodesic astronomy measurements, particularly relates to the digital zenith instrument. The technical solution is as follows: a resolving method of a rotating shaft of a digital zenith instrument, comprising the following steps: (A) building an image model of symmetrical observation pictures; (B) building resolving equation of the rotating shaft and computing Charge Coupled Device (CCD) plane coordinate; (C) computing ideal coordinate and earth coordinate of the rotating shaft; and (D) iteratively computing the rotating shaft. Actual experiments verifies that the method can accurately complete resolving of the rotating shaft in the location of the zenith instrument; the national first-class astronomical measurement accuracy level (not more than 0.3 inches and mLambda is not less than 0.3 inches) can be achieved primarily according to the digital zenith instrument designed by the invention; meanwhile, inner parameters such as focal length, principal point coordinate, distortion coefficient and so on do not need to be known; and the inner parameters are difficult to standardize when the optical axis resolving principle. Due to the fitting model, the method is suitable for tiny change of the optical system in a certain range, so that the system is more practical in the field environment.

Description

technical field [0001] The invention belongs to the technical field of geodetic astronomy surveying, in particular to a digital zenith instrument. Background technique [0002] The digital zenith instrument consists of an optical telescope, a CCD imaging device, a rotating platform, a leveling device, an inclination measuring instrument, a control and timing device, measurement data processing software, a notebook computer and an instrument erection device. Among them, the CCD imaging device and the telescope are installed on the rotating platform, which can rotate the telescope to shoot stars in different directions; the leveling device is used to automatically level the instrument, and measure the instrument tilt at the moment of shooting through a high-precision tilt measuring instrument; control and keep The timing device is used for instrument leveling, rotation, exposure, control of data transmission, and provision of precise time signals; the measurement data processi...

AI Technical Summary

Problems solved by technology

[0032] In order to control the imaging distortion of the telescope, the field of view of the general zenith instrument is very narrow (the field of view is usually only 1°~5°), and the light rays imaged by the telescope are almost parallel. At this time, the normal equation for solving the optical axis is very ill-conditioned. number reached 10 10 , the optical axis cannot be accurately calculated; at the same time, the internal parameters such as the focal length of the telescope, the coordinates of the principal point of the image, and the distortion constant cannot be calibrated accurately. Even if they are calibrated, they will change with the environment during use. Technology not feasible for digital zenith

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