Research On Inductively Coupled Data Transmission Rate Of Mooring Buoy

Inductively coupled transmission mooring buoys are used in long-term in-situ fixed-point observations and underwater data acquisition in marine environments.Inductively coupled transmission mooring buoy adopts inductively coupled data transmission mode.Compared with wired transmissions directly connected by conventional cables and wireless transmission based on acoustic principles,it's reliability and cost advantages are obvious,but it's data transmission rate is low,and it cannot cope with the real-time observation and transmission of huge ocean information in the future.Therefore,based on theory and practice,studies on the inductive coupling data transmission rate of mooring buoys and related technologies have very important application value for real-time observation of a large amount of information.Firstly,according to the structure of inductively coupled transmission mooring buoy which is composed of seawater and transmission cable,the corresponding inductively coupled data transmission circuit model is established.And the 2FSK(Frequency Shift Keying)digital signal modulation and demodulation method is adopted.The relation between carrier frequency and data transmission rate and data transmission performance is obtained through theoretical analysis.Secondly,in order to obtain the appropriate frequency parameters of the inductively coupled data transmission system,the experimental device is optimized by the coupled magnetic ring,the transmission cable electrode and the water body experiment,and the optimized device is used to conduct the inductively coupled data transmission characteristic experiment.The analysis shows that due to the inherent characteristic of the experimental system,the operating frequency and magnetic permeability of the coupled magnetic ring were limited,the amplitude of the output signal had a maximum value,and the appropriate frequency parameter were selected according to the frequency value corresponding to the maximum value.Then,the whole hardware circuit of the system was designed,the inductively coupled transmission mooring buoy system test prototype was built,the inductive coupled data transmission experiment was carried out,the underwater digital baseband signal transmission,the data transmission rate improvement and the bit error rate analysis were completed.Then,the multi-load inductive coupled data transmission experiment was carried out to realize the data transmission and rate optimization of the overwater digital baseband signal.The experimental results show that the inductively coupled data transmission rate of the system can reach 100 kbps,and the data transmission reliability is high,which can meet the needs of real-time observation of a large amount of information.