Fiber Optic Gyro for Land Navigation
نویسندگان
چکیده
Requirements for a gyroscope intended for use in land navigation in a coupled dead-reckoning/GPS are governed more by cost than by performance. As a result, explicit performance measures are poorly defined. The development of a low-cost fiber optic gyro for this application is described. Using openloop signal processing, a short coil length, and simple packaging concepts, it represents an evolutionary approach to meeting market demands. Based on elliptical-core polarization maintaining fiber, fused fiber couplers and an on-fiber polarizer, the components are assembled by fusion splicing. The optical circuit exhibits stability of less than 6 deg/hr RMS, although the overall gyro bias performance exhibits a temperature-dependent offset due to the analog signal processing technique. The optical circuit loss is low, permitting use of a low-power optical source.
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