Optical fiber inertia measurement combined device

Abstract

The invention discloses an optical fiber inertia measurement combined device which comprises an inertia framework, a fiber-optic gyroscope assembly, accelerometers, a tail fiber coiling plate and a locking pressing block. The inertia framework is of a spherical structure. The fiber-optic gyroscope assembly comprises three ring body assemblies and a light source and signal processing assembly. The three ring body assemblies are mounted in the inertia framework in a mutually orthogonal mode. The light source and signal processing assembly is connected with optical fibers of the ring body assemblies through the tail fiber coiling plate. The three accelerometers are mounted on the inertia framework in a mutually orthogonal mode. On the basis that fiber-optic gyroscopes have enough design space to guarantee precision, the rotating body rotating diameter generated when an inertia measuring assembly designs the self-calibration and self-alignment function is greatly reduced, and the optical fiber measuring assembly with high precision, self-calibration and self-alignment miniaturization and low cost is made possible.

Description

technical field [0001] The invention belongs to the field of inertial measurement technology and inertial devices, in particular to an optical fiber inertial measurement combined device. Background technique [0002] Strapdown inertial measurement unit (hereinafter referred to as inertial unit) is a combination of accelerometer, gyroscope and necessary signal processing components, used to measure the acceleration and angular velocity of moving carriers (such as vehicles, ships, aircraft, spacecraft, etc.), to complete the guidance and navigation function. With the development of technology, strapdown inertial groups with self-calibration and self-alignment functions (hereinafter referred to as "double self" inertial groups) have become a research hotspot. [0003] The self-calibration function aims at the fact that the parameters of the inertial device itself change with time, and the inertial group must be regularly removed and calibrated on the turntable, which leads to ...

AI Technical Summary

Problems solved by technology

Although the current high-precision laser gyroscope can meet the requirements of self-alignment accuracy of about 1′ or higher, the high-precision laser gyroscope is expensive and bulky, resulting in bulky and expensive inertial group products; the cost of fiber-optic gyroscope is low, but the accuracy of fiber-optic gyroscope Volume parameters are highly correlated, and the size of the fiber optic gyroscope with a precision of 0.001° / h is significantly larger than that of the 0.1° / h-0.01° / h fiber optic gyroscope, which brings great difficulties to the miniaturization design of the product structure, resulting in an excessively large inertial group rotation core. Finally, the volume of the rotary mechanism and the whole machine is too large

Under the premise of a certain cost, the huge conflict between precision and volume seriously restricts product design and application

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