A lightweight, miniature, three-axis integrated fiber optic inertial navigation device

Abstract

This invention discloses a lightweight, compact, three-axis integrated fiber optic inertial navigation device, belonging to the field of inertial navigation technology. Specifically, it relates to a lightweight, compact, three-axis integrated fiber optic inertial navigation device, comprising a housing, an inertial measurement unit (IMU), a magnetic shielding plate, and navigation control circuit components. The IMU includes three orthogonally arranged accelerometers, three orthogonally arranged fiber optic loop components, and an SLD (Single-Loop Light Source). The three fiber optic loop components share a single SLD light source, forming a three-axis integrated fiber optic gyroscope. The fiber optic loop components include a loop support, a 260m polarization-maintaining fiber optic loop, and a magnetic shield. The magnetic shield is fixed to the lower end face of the loop support, forming a closed magnetic shielding environment. The 260m polarization-maintaining fiber optic loop is located within this closed magnetic shielding environment. This invention optimizes the design of the IMU and navigation control circuit components of the fiber optic inertial navigation system, achieving magnetic shielding isolation of the fiber optic loop and physical isolation of heat-generating devices while reducing system weight and volume, thereby improving the stability of the navigation system.

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