Dynamic measuring device and method for plumb line deviation kept on basis of astronomical attitude reference

Abstract

The invention discloses a dynamic measuring device and method for plumb line deviation kept on the basis of an astronomical attitude reference. An INS / GPS attitude measurement subsystem and an LGU / GPS attitude measurement subsystem are built, wherein an initial value adopted for attitude updating by the LGU / GPS attitude measurement subsystem is provided by attitude information output by a star sensor. The difference between the attitude output by the LGU / GPS attitude measurement subsystem and the attitude output by the INS / GPS attitude measurement subsystem is obtained, and further the plumb line deviation is calculated. Finally, jump errors in the measuring values of the plumb line deviation are finally corrected, and low frequency errors in the measuring values of the plumb line deviation are corrected by utilizing global gravity model data. The systems in the invention are simple; the method provided by the invention is strong in robustness, and the measuring results are stable; requirements to GPS accuracy are lowered; compared with a traditional vector airborne gravitometer which relies on high precision difference GPS, the dynamic measuring device provided by the invention only requires common GPS single point positioning to meet accuracy requirements. Therefore, the application scope of the measuring method is expanded.

Description

technical field [0001] The invention relates to the field of surveying and mapping, in particular to a dynamic measurement method for vertical line deviation based on astronomical attitude reference maintenance. Background technique [0002] Due to factors such as the irregular shape of the earth, the undulation of the terrain, and uneven density distribution, there are differences between the actual gravity field and the normal gravity model, which are called gravity disturbances. The vertical component is called gravity anomaly, and the horizontal component is shown as a vertical line deviation. Perpendicular deviation is a very important data in geodesy and space science. The elevation anomaly can be calculated and the geoid can be determined through the vertical deviation, and it can also be applied to the reduction calculation of astronomical geodetic observation data, ballistic calculation, space technology and high-precision inertial navigation. In addition, by stud...

AI Technical Summary

Problems solved by technology

However, for applications in some special fields, such as earthquake and volcano monitoring, mineral exploration, and ultra-high-precision navigation, it is still difficult to meet the requirements

[0009] In view of the difficulty in obtaining high-precision vertical deviation data, it is urgent to develop a new method that can realize vertical deviation measurement under dynamic conditions, so as to obtain high-precision, high-resolution vertical deviation data more efficiently and reduce measurement The cost and time consumed to promote the development of other related disciplines

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