Light and small high-precision composite inertial navigation system and navigation mode switching method

Abstract

The invention discloses a light, small, high-precision composite inertial navigation system and a navigation mode switching method. The navigation system includes a base, an outer rotating frame mounted on the base through a first bearing rotation, and an outer rotation frame installed on the outer rotation frame through a second bearing rotation. The inner rotating frame on the rotating frame and the inertial measurement unit arranged on the inner rotating frame, one end of the inner rotating frame and the outer rotating frame are respectively provided with a driving assembly, and the other end is respectively provided with a locking mechanism, and the driving assembly includes an ultrasonic motor and an angle The sensor and the locking mechanism include a moving plate, a disc spring, a coil, a casing and a fixed plate. The moving plate is in contact with the inner rotating frame and the outer rotating frame respectively. The disc spring is arranged between the moving plate, the fixing plate and the housing. The magnetic field generated by the coil is stretched to realize the support and distance of the moving plate, and the coil changes the magnetic field by controlling the current input. Ultrasonic motor and electromagnetic lock can be quickly locked and unlocked in harsh mechanical environments to meet the needs of complex mechanical environments.

Description

technical field

[0001] The invention belongs to the technical field of inertial navigation, and in particular relates to a light, small and high-precision composite inertial navigation system and a navigation mode switching method. Background technique

[0002] The strapdown inertial system with a rotating mechanism, referred to as "composite inertial system", is a new type of inertial navigation system between the strapdown inertial system and the platform inertial system proposed in China in recent years. In terms of system composition, compared with the traditional strapdown inertial navigation system, the composite inertial system adds a set of rotating mechanisms; compared with the traditional platform inertial system, the composite inertial system greatly reduces the rotation accuracy of the rotating mechanism. The difficulty is greatly reduced. In terms of performance, the composite inertial system can have a self-calibration function after adopting a rotating mechan...

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