Modeling method of long-distance linear time-varying transmission channel for deep-sea navigation and disposable profiler
A transmission channel and discarding technology, which is applied in the field of long-distance linear time-varying transmission channel modeling of deep-sea navigation and discarding profilers, can solve the problem of unguaranteed stable channels, difficult signal demodulation, and affecting channel transmission stability To achieve the effect of improving the accuracy and stability of transmission and solving the bottleneck problem of technological development
Inactive Publication Date: 2018-12-25
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology
Due to the requirements of the environment, most of the signal transmission parts of deep-sea navigation and discarded measuring instruments use wired channels. With the rapid decline of the probe, the transmission line originally wound on the bobbin is continuously released. Decrease, expand the inter-line capacitance of the transmission line is increasing, the electrical impedance of the channel, the inter-line capacitance is more and more destructive to the integrity transmission of the signal, the online distribution parameters are constantly changing, and a stable channel cannot be guaranteed. This dynamic The real-time changing channel impedance characteristics destroy the stability of signal transmission, and the signal distortion is serious, which seriously affects the stability of channel transmission of deep-sea navigation and abandonment measuring instruments
Especially in high-speed communication, the commonly used digital communication methods are no longer suitable for this situation, which brings great difficulties to signal demodulation
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Embodiment 1
[0027] For the XCTD channel, the entire system is a complex time-varying system because the length of its payout is constantly changing. If the entire dynamic process is directly measured, it will not only increase the difficulty of the actual measurement but also bring various problems to the actual measurement. Various problems affect the measurement results. Therefore, in order to simplify the difficulty of the experiment and increase the accuracy of the measurement, we choose to fix the length of the wire. Once the length of the wire is fixed, the various impedance parameters are fixed. The channel system is a constant The changed system is more conducive to channel measurement.
[0028] Step 1. Measurement of channel transmission characteristics
[0029] For a system at an unknown fixed depth, assuming that its transfer function is H(jw), the sending signal is X(jw), and the system receiving signal is Y(jw), then
[0030] Y(jw)=H(jw)X(jw) (1)
[0031] where H(jw) is a c...
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By using a transmission channel of an oceanpack expendable temperature, salinity and humidity profiler as a prototype, the invention brings forward a method for directly testing channel characteristics without system modeling on the basis of the channel itself. With the increasing of measurement depth, impedance parameter of the transmission channel changes greatly, leading to severe distortion and attenuation of data during the transmission process. Thus, the precision of measurement data is severely influenced. Due to XCTD transmission channel time-varying complex characteristics, the research on characteristics of the transmission channel itself is of great significance for the precision of data transmission. Based on the XCTD channel itself, by the utilization of an LABVIEW platform and a data collection card, amplitude-frequency and phase-frequency characteristics of a channel at fixed depth are obtained through lots of experimental data statistics, and the measured channel transmission characteristics are verified, and a corresponding communication mode is designed in allusion to channel transmission characteristics and signal frequency. Therefore, new ideas of solution are provided for accurate transmission of communication data of those apparatuses.
Description
technical field [0001] The present invention uses the transmission channel of the deep-sea sailing and discarding type temperature, salinity and depth profiler (abbreviation, XCTD) as a prototype to propose an effective method for the amplitude-frequency and phase-frequency characteristics of this type of unknown linear time-varying wired channel. Measurement methods, and finally a new method for this type of channel model building is established. Background technique [0002] XCTD is a typical representative of deep-sea navigation and disposable profilers. It is disposable and consists of two parts: a receiver on the water and an underwater probe. The sensor in the probe starts to measure after entering the water. Shen (speed about 3-5 m / s), the data collector inside the probe completes the collection, processing and transmission of marine environmental parameters in real time, and uploads them to the receiver on board synchronously in the form of digital signals through th...
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IPC IPC(8): G01C13/00
CPCG01C13/00
Inventor 郑羽靳翔羽王晓瑞东磊窦珺荣宋国民尚应生
Owner TIANJIN POLYTECHNIC UNIV