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Multi-position strapping north-seeking system direction effect calibration method

A technology of azimuth effect and calibration method, which is applied in the direction of measuring devices, instruments, rotating gyroscopes, etc., to achieve the effect of improving measurement accuracy and eliminating measurement errors

Inactive Publication Date: 2008-05-28
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Retrieval of relevant literature, no relevant reports, patents and papers reported on it, only related articles on the course effect and course drift of the platform inertial navigation system

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  • Multi-position strapping north-seeking system direction effect calibration method

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[0016] The method of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0017] With reference to Fig. 1, 2, the calibration method of the azimuth effect of the multi-position strapdown north-seeking system of the present invention, by means of a true north prism, two theodolites and a mechanical indexing turntable is carried out as the auxiliary test tool according to the following steps:

[0018] a. The multi-position strapdown north-finding system 5 to be calibrated fixed on the mechanical indexing turntable 4 and the true north prism 3 and two theodolites 1 and 2 are placed on the same horizontal plane, and the two theodolites The first theodolite 1 of the two theodolites is collimated and aimed at the true north prism 3 so that it is on the normal line of the true north prism, and the second theodolite 2 of the two theodolites is collimated and aimed at the casing of the multi-position strapdown north-seeking sys...

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Abstract

The invention belongs to a calibration method of an error which is measured by a multi-position strapdown north seeking device, in particular to a calibration method of orientation effect of a multi-position strapdown north seeking device. A true north prism, two theodolites and a mechanical dividing rotating platform are used as auxiliary testing tools, the multi-position strapdown north seeking device is fixed on the mechanical dividing rotating platform, and is divided according to one circle equipartition point, an angle of a benchmark prism of a strapdown north seeking system and the true north direction is defined through rotating an equipartition angle value at one time by the mechanical rotating platform and through the true north prism system in an initial rotating position of the north seeking system, and then the angle is compared with a north-oriented value which is measured by the strapdown north seeking system, the error is calculated, and an azimuthal effect of a gyroscope which is simulated according to the characteristic of the error is marked. The invention effectively eliminates measuring error which is caused by the azimuthal effect, thereby improves the measuring accuracy of the multi-position strapdown north seeking system.

Description

technical field [0001] The invention belongs to a method for calibrating measurement errors of a multi-position strapdown north-seeking system composed of gyroscopes as sensors, in particular to a method for calibrating measurement errors caused by azimuth effects. Background technique [0002] A gyro compass is a navigational instrument that can automatically find and track the local geographic meridian. The gyro compass uses the comprehensive effect of the earth's rotation angular velocity and the gravitational field to make the rotation axis of the two-degree-of-freedom gyroscope automatically find the true north. The true north here is actually the direction determined by the north component of the earth's rotation angular velocity. It uses a gyroscope as a sensor to indicate the true north. It does not depend on any external conditions and does not need other heading instruments for correction. Its greatest feature is its strong autonomy. Azimuth datum. The successful...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00G01C19/38
Inventor 沈铖武王志乾赵雁高峰端李建荣刘畅
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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