Method for analyzing influence of time-varying channel of deep sea navigation XCTD on transmission performance

Abstract

The invention provides a method for dynamically analyzing a wired channel of a navigation XCTD section plotter on a transmission signal amplitude and phase, wherein the transmission channel of the navigation XCTD section plotter is adopted as a prototype. The paying off length is changed constantly, so that online parameters are changed constantly, a stable channel cannot be guaranteed, and the channel transmission stability of the deep sea navigation disposable measuring instrument is seriously influenced by the channel impedance characteristic changed in real time. A simplified transmission circuit model and a transmission function of the model are built. The transmission frequency, distributed capacitance and the influence of winding inductance on the signal phase are obtained through qualitative analysis. The influence of the channel on the signal amplitude and phase in the dynamic paying off process of the XCTD is analyzed through MATLAB software. The circuit design of a disposable navigation measuring system can be further guided, and the precision of measuring data and the stability of signal transmission are improved.

Description

technical field [0001] The invention takes the transmission channel of a mobile disposable temperature, salinity and humidity (XCTD) profiler as a prototype, and proposes a method for dynamically analyzing the influence of the wired channel on the amplitude and phase of the transmission signal. Background technique [0002] The main products of disposable measuring instruments are temperature profiler (XBT), temperature and salinity profiler (XCTD), sound velocity profiler (XSV) and ocean current profiler (XCP), among which XCTD is the most commonly used. This type of instrument is for one-time use. It consists of two parts: an underwater receiver and an underwater probe. After entering the water, the sensor in the probe starts to measure. The internal data collector completes the collection, processing and transmission of marine environmental parameters in real time, and transmits them to the ship synchronously in the form of digital signals through the thin transmission li...

AI Technical Summary

Problems solved by technology

Due to the requirements of the environment, most of the signal transmission part of the deep-sea navigation disposable measuring instrument uses a wired channel. With the rapid decline of the probe, the transmission line originally wound on the spool is continuously released, and the inductance of the spool continues to decrease as the length of the pay-off line changes Small, the capacitance between the expanded transmission lines is increasing, the electrical impedance of the channel, and the capacitance between the lines is becoming more and more destructive to the integrity transmi

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