Inertial navigation system and high-rotating-speed rotating body attitude measurement method

Abstract

The invention provides an inertial navigation system and a high-rotating-speed rotating body attitude measurement method. The method comprises the following steps: measuring normal inertia informationand geomagnetic information of a rotating body in a present resolving period; and establishing a geomagnetic attitude calculation coordinate system, performing attitude calculation in the geomagneticattitude calculation coordinate system by utilizing the geomagnetic information and the normal inertial information, and performing coordinate transformation on the calculated attitude to obtain attitude information of a projectile body coordinate system relative to the geographic coordinate system. According to the invention, the sensor cost can be reduced, and the problems of insufficient rollangle range and rapid divergence of measurement precision along with time in the existing inertia / terrestrial magnetism combined attitude measurement system are solved.

Description

technical field [0001] The invention belongs to the technical field of inertial navigation, and relates to an inertial navigation system and a method for measuring the attitude of a high-speed rotating body. Background technique [0002] Attitude information is the core measurement data of the navigation and guidance system. It usually refers to the attitude angle of the missile body coordinate system relative to the geographic coordinate system, including roll angle, pitch angle and heading angle. For high-speed rotating bodies such as guided rotating bombs, the conventional inertial attitude measurement system cannot measure the roll angle because the roll angle rate is as high as 8 to 15 revolutions per second, which is far beyond the range of typical gyro devices. [0003] Using geomagnetic information to calculate the roll angle and pitch angle has the advantages of large measurement range and no error accumulation over time, but usually requires other heading angle inf...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide an inertial navigation system and a method for measuring the attitude of a high-speed rotating body, reduce the cost of sensors, and solve the problem of existing inertial / geomagnetic combined attitude measurement In the system, the roll angle measurement range is insufficient and the measurement accuracy diverges rapidly over time.

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