Optimization of second-harmonic’s quantization precision for intensity modulation noise suppressing in a digital RFOG
| Autor: | Jianmin Mao, Zeyu Wang, Kebin Ye, Zhonghe Jin, Diqing Ying |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
business.industry Quantization (signal processing) Shot noise 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials 010309 optics Optics Control theory 0103 physical sciences Demodulation Hardware circuits Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology business Closed loop Intensity modulation |
| Zdroj: | Optics Communications. 405:114-119 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2017.07.071 |
| Popis: | Aiming at the demodulation signal compensation technique for intensity modulation noise suppressing in a digital RFOG, which is based on the detection of closed loop’s second-harmonic, the quantization precision for second-harmonic is discussed and optimized. By analyzing second-harmonic’s fluctuation under the intensity modulation noise equal to shot noise limited sensitivity, the expression for the required minimum quantization bits of second-harmonic signal is obtained. Based on this expression, numerical simulations are carried out to optimize the quantization bits in a digital RFOG in detail. Based on over-sampling technique, the stability of gyro output signal with different quantization bits and rotation rates is tested to verify the theoretically analyzed results. It is concluded that the minimum quantization bits of second-harmonic is related to the rotation rate and the ratio of second-harmonic’s maximum to minimum, and it gets larger as these two parameters are increased. Especially, the required minimum quantization bits for second-harmonic would generally exceed that supported only by hardware circuits, which leads to the adoption of over-sampling technique. And it is proven that the quantization precision improvement for second-harmonic, realized by the over-sampling technique, does work in improving the effect of intensity modulation noise suppressing. |
| Databáze: | OpenAIRE |
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