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由于环境的要求,深海走航抛弃式测量仪器信号传输大多使用有线信道,然而,信道的电阻抗随放线长度不断变化,严重影响了深海走航抛弃式测量仪器信道传输的稳定性.本文以国家海洋技术中心自主研发的走航抛弃式温度、盐度、湿度(XCTD)剖面仪的传输信道为原型,提出了一种动态分析有线信道对传输信号幅值和相位影响的方法.首先推导出各电路参数随信道长度变化的规律,建立简化的传输电路模型和该模型的传输函数.通过定性分析得出传输频率、分布电容和缠绕电感对信号相位的影响.利用MATLAB软件分析XCTD在动态放线过程中信道对信号幅值和相位的影响.研究结果可进一步指导抛弃式走航测量系统的电路设计,提高测量数据的精度和信号传输的稳定性.
However, the electrical impedance of the channel keeps changing with the length of the pay-off line, which seriously affects the stability of the channel transmission of the abyssal sea-going abandoned measuring instruments.In this paper, A prototype of the transmission channel of abandonment temperature, salinity and humidity (XCTD) profiler independently developed by CNOOC is proposed, and a method of dynamically analyzing the influence of a wired channel on the amplitude and phase of the transmitted signal is proposed. Firstly, The circuit parameters of each circuit vary with the channel length, and a simplified transmission circuit model and the transfer function of the model are established. The influence of transmission frequency, distributed capacitance and winding inductance on signal phase is obtained through qualitative analysis. By using MATLAB software, The influence of the channel on signal amplitude and phase in the process of line.The research results can further guide the circuit design of the abandoned navigation system and improve the accuracy of measurement data and the stability of signal transmission.