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光栅法布里-珀罗腔干涉型水听器系统内的时域串扰严重限制了其实际应用,因此,对系统内时域串扰的产生机理进行分析,讨论在相位产生载波(PGC)解调方法下干涉信号的幅度对其相位信息的影响,并制作了两组不同反射率光栅水听器进行对比实验。实验表明,高反射率(R=0.6)光栅系统时分串扰明显,串扰信号在满足PGC解调能力的基础上其相位信息不会明显衰减;低反射率(R=0.02)光栅实现了34dB的串扰抑制。进一步研究发现,低反射率光栅系统中的串扰主要由前端水听器单元外加信号引起的多普勒效应噪声和时分串扰噪声组成。
The time-domain crosstalk in a grating Fabry-Perot cavity interferometric hydrophone system severely limits its practical application. Therefore, the generation mechanism of time-domain crosstalk in the system is analyzed. The phase-generated carrier (PGC) demodulation Method of interference signal amplitude of its phase information, and made two different reflectivity grating hydrophone for comparative experiments. Experiments show that the crosstalk of the grating system with high reflectivity (R = 0.6) is obvious, and the phase information of the crosstalk signal will not be obviously attenuated when the PGC demodulation ability is satisfied. The grating with low reflectivity (R = 0.02) inhibition. Further study found that the crosstalk in the low reflectivity grating system mainly consists of Doppler effect noise and time-division crosstalk noise caused by the signal applied by the front-end hydrophone unit.