| Ocean, about 69.5% of the Earth’s surface area, is the largest natural geographical unit in which the hidden part of the natural resources even richer than the same resources known on the land. Marine resources has been a treasure trove of countries around the world tried to explore, therefore, development of marine exploration-type devices attracted widespread attention at home and abroad. Especially after the event of Malaysia Airlines lost contact, the development of this type of equipment is attached great importance. XCTD (Expendable Conductivity Temperature Depth Profiling System) is a cheap type of marine detect equipment that abroad in recent years to develop. Since the advent, it get the high concern on oceanography.The Expendable Conductivity-Temperature-Depth (XCTD) profiler is often used for ocean depth measurement and uses an enameled wire transmission channel. However, the changing impedance characteristics of the dynamic real-time channel affect the stability of the signal transmission. In this paper, we study the XCTD of China, using a deep-sea abandoned measuring instrument transmission channel as the original model, we present:(a) a method for establishing a time-varying channel model, (b) accurate computation of the transmission cable and spool cable distributed capacitance, winding inductance and distributed resistance, (c) a discussion on the impedance values generated by the coupling effect of seawater. The establishment of the channel transfer function model illustrates the effects of the time-varying channel on the signal transmission performance and can improve the signal transmission capacity by providing a theoretical basis for analysis of the XCTD channel.
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