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Inertial navigation system combining fibre-optic gyroscope with micromechanical gyroscope and navigation method

A micromachined gyroscope and inertial navigation system technology, applied in the field of high-performance inertial systems, can solve the problems of high cost, weak market competitiveness, and low cost performance, and achieve the effects of improving performance, low cost, and low power consumption

Active Publication Date: 2015-05-06
AKD COMM TECH
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Problems solved by technology

Generally, high-precision optical gyroscopes and high-precision accelerometers are used to realize, but the cost is expensive, the cost performance is low, and the market competitiveness is weak

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  • Inertial navigation system combining fibre-optic gyroscope with micromechanical gyroscope and navigation method

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[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0036] Compared with the MEMS gyroscope, the fiber optic gyroscope has high precision, high price and large volume. In the integrated navigation system, since the drift of the celestial gyro is generally unobservable, resulting in the drift of the heading angle, the medium-precision fiber optic gyroscope can be used as a heading hold, so that...

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Abstract

The invention provides an inertial navigation system combining a fibre-optic gyroscope with a micromechanical gyroscope and a navigation method. The system comprises the fibre-optic gyroscope and an MEMS gyroscope which are arranged in the form of mutual redundancy; in a normal state, the fibre-optic gyroscope measures an angular velocity in an azimuth axis, and is automatically switched to the MEMS gyroscope while being failed. A navigation method of the inertial navigation system combining the fibre-optic gyroscope with the micromechanical gyroscope provided by the invention provides an online calibration and compensation function, that is, after the inertial system finishes rough error calibration, error estimation and compensation for the drifting of the gyroscopes and the zero offset of an accelerometer are realized in a set motion mode, so that the requirements of the system on equipment are reduced, the cost is greatly reduced, and the performance of the inertial system is also improved in real time.

Description

technical field [0001] The invention relates to the technical field of inertial navigation systems, in particular to an inertial navigation system and a navigation method combining optical fiber gyroscopes and micromechanical gyroscopes, which combine the advantages of optical gyroscopes and micromechanical gyroscopes to form a high-performance inertial system that complements each other. Background technique [0002] Traditional inertial navigation systems are classified according to gyroscopes, and are generally divided into optical (such as optical fiber, laser, etc.), micromechanical (MEMS), flexible, etc. [0003] The fiber optic gyro adopts solid structure and uses light as a sensitive signal, so the warm-up time is very short, and it has high reliability, long life and anti-interference. Since the light source is located at the periphery of the working circuit, even at low speed rotation, there will be no latch-up problem similar to that of a laser gyro. However, the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/16G01C25/00
CPCG01C21/16G01C25/005
Inventor 张金余
Owner AKD COMM TECH
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