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Ultrashort base line magnetic declination measuring method based on gyro theodolite

A measurement method and ultra-short baseline technology, applied in theodolite, measuring device, measuring angle, etc., to achieve the effects of ensuring measurement accuracy, reducing centering errors, and reducing length requirements

Inactive Publication Date: 2014-06-11
THE CHINESE PEOPLES LIBERATION ARMY 92859 TROOPS
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a kind of ultra-short baseline magnetic declination measurement method based on gyro theodolite, solve the magnetic declination measurement problem when the observation baseline is shorter than 200m

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  • Ultrashort base line magnetic declination measuring method based on gyro theodolite

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[0015] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0016] An ultra-short baseline magnetic declination measurement method based on gyro theodolite is a method for measuring magnetic declination with gyro theodolite for the problems existing in the land mobile geomagnetic measurement scheme (GNSS-based magnetic declination measurement method). new ideas. Design thinking of the present invention is described below:

[0017] We analyze the mobile geomagnetic survey scheme on land: assuming that the observation baseline length is s and the centering error is Δ, then the earth azimuth error caused by the centering error of the instrument is:

[0018] m = Δ s × 206265

[0019] Due to the strong wind and fog during the measurement of islands and reefs, the final centering error is generally 5mm no matter whether op...

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Abstract

The invention relates to an ultrashort base line magnetic declination measuring method based on a gyro theodolite. The main technical characteristics are as follows: erecting a magnetic theodolite and a gyro theodolite respectively on a primary measuring point and an auxiliary measuring point on a base observing line, centering and leveling respectively, then aiming at each other by telescopes, and locking the telescopes of the magnetic theodolite and the gyro theodolite still; using the sight axis of the magnetic theodolite and the gyro theodolite as the aiming direction of the geodetic azimuth and magnetic declination of the base observing line; measuring the geodetic azimuth alpha of the base observing line; measuring the magnetic azimuth alpham of the base observing line; and calculating the magnetic declination D of the base observing line. By adopting the method of aiming the magnetic theodolite and the gyro theodolite with each other, the centering error is greatly reduced, the length requirement of the base observing line is lowered, the measurement of magnetic declination can be relatively suitable for being used performed on an island reef with the small area and insufficient effective sight distance, the measuring precision is ensured, and the problem of measurement of the magnetic declination of an ultrashort base line is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of marine measurement, in particular to a method for measuring ultra-short baseline magnetic declination based on a gyro theodolite. Background technique [0002] Magnetic declination measurement on islands and reefs is an important part of oceanographic measurement. The National Earthquake Administration's "China Geomagnetic Map Field Observation Specification and Its Implementation Rules 2003" requires that the observation baseline of land mobile geomagnetic survey should be greater than 200m, and differential GPS should be used for true azimuth measurement. When measuring magnetic declination on land, it is not difficult to ensure that the observation baseline is greater than 200m, but it is difficult to achieve when measuring on islands and reefs. This is because most of the islands and reefs in my country are small in size, with large terrain drop and dense vegetation, and it is generally difficult to ...

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Application Information

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IPC IPC(8): G01C1/00
CPCG01V3/40G01C1/02
Inventor 任来平欧阳永忠吴太旗李凯锋陆秀平黄贤源邓凯亮王耿峰
Owner THE CHINESE PEOPLES LIBERATION ARMY 92859 TROOPS
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