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双光束干涉仪的相位调制解调通常会用到椭圆拟合的方法来计算相应的解调参数,提出了一种用于评价这类参数的计算精度的方法。根据自适应的蒙特卡罗法,计算不同噪声水平下椭圆拟合估算的参数的最大偏差;根据实验测得的干涉信号噪声本底的大小,判断拟合的参数的精度。以基于3×3耦合器的光纤水听器的两路输出方案为例,该方案为提高水听器的解调性能,需研究参数的数值随器件性能的变化规律,因此首先要判定实验中通过椭圆拟合所求得的参数的准确性。将该精度评定方法运用在水听器测量实验中,测量的干涉信号在20 Hz~4 k Hz处的噪声本底接近-70 d B·V2/Hz,根据自适应的蒙特卡罗法,得到参数的偏差不超过0.06%和0.08°。
The phase modulation and demodulation of the dual-beam interferometer usually uses the ellipse fitting method to calculate the corresponding demodulation parameters, and proposes a method for evaluating the calculation accuracy of such parameters. According to the adaptive Monte Carlo method, the maximum deviation of the parameters estimated by ellipse fitting under different noise levels is calculated. The accuracy of the fitted parameters is judged according to the noise background of the interferometric signal measured experimentally. Taking the two output schemes of a 3 × 3 coupler-based fiber hydrophone as an example, in order to improve the demodulation performance of the hydrophone, the program needs to study the variation of the parameter values with the performance of the device. Therefore, The accuracy of the parameters obtained by ellipse fitting. The accuracy evaluation method is applied to the hydrophone measurement experiment. The noise floor of the measured interference signal at 20 Hz ~ 4 k Hz is close to -70 d B · V2 / Hz. According to the adaptive Monte Carlo method, The deviation of the parameters does not exceed 0.06% and 0.08 °.