Signal detection stability is very important for vector fiber-optic hydrophone and hydrophone array, because theinstability of the demodulated signal directly leads to the target azimuth estimation error and the degradation of systemperformance. In this paper, a method to achieve high-stability signal demodulation for interferometric vector fiber-optichydrophone is studied. A parameter estimation and demodulation parameter compensation method for phase generatedcarrier demodulation system is proposed based on elliptic curve parameter fitting algorithm. An elliptic curve isconstructed using the second and third frequency of the reference interference signal. The ellipse curve fitting algorithmis introduced to estimate the distortion parameter of the modulation and demodulation system by fitting the value of eachelliptic curve parameter. By compensating the PGC demodulation for the tested signal with the estimated parameters,the instability of demodulation system caused by PGC modulation depth variation and additional modulation intensity ofthe light source can be effectively reduced. The feasibility of the method is verified by simulation experiments and actualsystem experiments. High stability signal detection is realized using the proposed method, which can effectivelyimproves the detection effect of the vector fiber-optic hydrophone array.
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