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在光纤水听器时分复用系统中,需要设计高增益,大带宽的信号检测电路。为了减小系统的噪声同时抑制通道间串扰,必须选择合适的电路带宽。本文分析了待检测信号带宽与脉冲形状的关系,以及电路串扰率与电路带宽、脉冲宽度、通道间延时的关系,给出了电路串扰率的解析表达式,得到了电路串扰带来的解调信号误差的表达式,分析表明电路串扰导致的解调信号误差的幅度与电路串扰率成正比,与前一通道施加的声信号的幅度的贝塞尔函数成正比,最后给出了与理论分析相符的实验结果。
In fiber optic hydrophone time division multiplexing system, the need to design high gain, large bandwidth signal detection circuit. In order to reduce the system noise while suppressing the inter-channel crosstalk, you must select the appropriate circuit bandwidth. This paper analyzes the relationship between the signal bandwidth to be detected and the shape of the pulse, the relationship between the circuit crosstalk rate and the circuit bandwidth, the pulse width and the delay between channels, and gives the analytical expression of the crosstalk rate of the circuit. The analysis of the signal error shows that the amplitude of the demodulated signal error caused by the circuit crosstalk is proportional to the crosstalk rate of the circuit and is proportional to the Bessel function of the amplitude of the acoustic signal applied in the previous channel. Finally, Analysis of the corresponding experimental results.