A Down Sampling Technique for Open-Loop Fiber Optic Gyroscopes and Its Implementation with a Single-Chip Digital Signal Processor

概要

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A down sampling technique was applied to signal processing of fiber optic gyroscopes with optical phase modulation. The technique shifts the frequency spectrum of the gyroscopic signal down to low frequencies, and lowers the speed requirements for analog-to-digital (A/D) conversion and numerical operations. A single-chip digital signal processor (DSP)with a built-in A/D converter and timers was used to demonstrate the proposed technique. The DSP internally generated a phase modulation signal and sampling trigger timing. The reference signals for digital lock-in discrimination of gyroscopic spectrum are generated by using an external binary counter, and their phases were adjusted optimally by DSP software. The DSP compensated for the fluctuations in laser source intensity and phase modulation index, using the signal spectrum extracted, and linearized the gyroscopic response. The measured resolution of rotation detection was 0. 9 deg/s (with a full scale of ± 100 deg/s) and it agreed with the resolution in A/D conversion.
社団法人電子情報通信学会の論文
1995-08-25