Marine compass and dynamic calibration method thereof

Abstract

The invention discloses a marine compass and a dynamic calibration method thereof, belonging to the field of course and attitude measurement of marine carriers. The marine compass comprises a fiber-optic gyroscope, two single-axis tilt angle sensors and two electronic bubbles. The fiber-optic gyroscope measures a course angle in real time; the single-axis tilt angle sensors measure pitch angles and roll angles in real time; the electronic bubbles detect whether a carrier is located at a horizontal position or not, and performs calibration compensation by acquiring angle measurement errors generated by the tilt angle sensors when the carrier is located at the horizontal position. The marine compass disclosed by the invention can provide course and attitude information for the carrier and calibrate inclination angle measurement data by adopting the electronic bubbles, so the attitude measurement accuracy of the tilt angle sensors is improved; and the marine compass has the advantages oflow manufacturing cost, small size and high dynamic angle measurement accuracy.

Description

technical field [0001] The invention relates to the field of heading and attitude measurement of a sea carrier, in particular to a marine compass for a sea carrier working in a dynamic environment and a method for dynamic calibration thereof. Background technique [0002] The compass is an instrument that provides a direction reference and is used to determine the course and the orientation of the observed objects. It is widely used on marine vehicles. The accuracy of the compass directly affects the course and safety of the vehicle. [0003] At present, the common marine compass is based on the strapdown inertial navigation system, which uses three fiber optic gyroscopes to continuously measure the angular velocity of the carrier, and then obtain the attitude change angle and heading change angle of the carrier within a certain time interval. However, since the marine carrier is always in a dynamic environment, the drift of the fiber optic gyro has become the main factor of...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem that the marine compass in the prior art cannot eliminate the cumulative error and cannot be widely used in small carriers due to high cost, the present invention provides a marine compass, which replaces the marine fiber optic gyroscope by using two single-axis inclination sensors The fiber optic gyro on the X-axis and Y-axis on the compass space coordinate system provides heading and attitude information, and uses electronic water bubbles to calibrate its measurement data to eliminate the cumulative error in attitude measurement. While meeting the accuracy requirements, it has the advantages of low cost, Advantages of small size and high precision of dynamic angle measurement

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