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Correction method for the deviation of magnetic compass

A self-difference correction and magnetic compass technology, which is applied in the field of magnetic compass self-difference correction, can solve problems such as difficulty in implementation, inability to determine compass heading, cumbersome procedures, etc.

Active Publication Date: 2010-01-20
ARMY MILITARY TRANSPORTATION UNIV OF PLA ZHENJIANG
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Problems solved by technology

[0006] (1) This method theoretically requires the ship to eliminate the self-difference force in certain special magnetic headings. However, in the case of unknown magnetic compass self-differences, it is impossible to determine the corresponding magnetic heading by the magnetic compass itself. Luo Xiangxiang
Airifa proposes that the magnetic heading can be replaced by the Luo heading first, and then the Luo heading can be gradually approached to the magnetic heading after repeated corrections of multiple sets of overlapping marks. This compromise method not only has certain errors, but also has cumbersome procedures and is difficult to implement.
[0007] (2) Since the Airy method needs to compare the compass azimuths of multiple sets of known magnetic azimuths to determine the magnitude of the self-difference angle, in the traditional implementation process, it needs to be performed in a special calibration site.

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0036] The theoretical system of this method mainly includes two parts: one is to calculate the accurate differential coefficient of the magnetic compass, and the other is to eliminate the four main differential forces in a single magnetic heading according to the accurate differential coefficient. 2.1 Calculation of the accurate error coefficient of the magnetic compass

[0037] According to the analysis of the self-difference principle of the magnetic compass, when the hull is level, the magnetic compass on the ship receives a total of six forces in the horizontal direction, namely: λH, A′λH, B′λH, C′λH, D 'λH, E'λH. Among them, λH is the northerly force, and the other forces are self-differential forces, whose magnitude is basically fixed after the ship is built, and its direction changes regularly with the ship's turning.

[0038] Under the combined action o...

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Abstract

The invention discloses a correction method for the deviation of a magnetic compass, belonging to the technical field of the deviation elimination method of a magnetic compass. The invention comprises the following steps: firstly, calculating accurate deviation coefficient of the magnetic compass, and secondly, eliminating four main deviation forces in a single magnetic heading direction. The invention has the advantages of little ground dependence, simple process, easy implementation, reduced range, fuel saving, software calculation and high automation degree.

Description

technical field [0001] The invention relates to a magnetic compass self-difference correction method, which belongs to the technical field of magnetic compass self-difference elimination methods. Background technique [0002] The magnetic compass is an ancient nautical pointing instrument, which indicates the magnetic north for people by sensing the direction of the geomagnetic force lines. Due to the simple working principle of the magnetic compass, it can work without external energy, so even in today's increasingly automated navigation instruments, the United Nations Maritime Organization still stipulates that the magnetic compass is one of the necessary instruments for seagoing ships. Since modern ships use a large amount of steel for hull construction, the magnetic compass on the ship will also be affected by the magnetism of these steels, resulting in pointing errors. This error is the self-difference of the magnetic compass. In order to ensure the safety of navigatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C17/38
Inventor 赵柯时昌金
Owner ARMY MILITARY TRANSPORTATION UNIV OF PLA ZHENJIANG
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