Design Of A Multi-physical Parameter Data Acquisition And Transmission Device For Shallow Oceans In The Kilometer Level

The collection and transmission of ocean data is the key technology for obtaining ocean data and an important driving force for studying ocean energy and making the ocean transparent.According to the project "Research on MEMS-based deep turbulence mixing matrix profile observation instrument for the whole sea",the requirement for data collection CTD,MEMS turbulence sensor,compass sensor,and attitude sensor at 1000 m on the seafloor is proposed in the project,This paper proposes the design of a multi-physical parameter data acquisition and transmission device for shallow oceans with a distance of more than one kilometer.This system can realize the full data acquisition and storage of these four types of sensors,In addition,the data of the CTD,compass sensor,and attitude sensor are transmitted in real time,and the data is analyzed through the host computer to realize real-time display of important physical quantities such as temperature,depth,salinity,conductivity,and profiler attitude;Design the throwing circuit module,combined with the display of the important physical parameters of the host computer to throw the sub-equipment;real-time transmission and storage of the camera video carried by the profiler,so as to make full preparations for the profiler to release the subequipment at a distance of 500-1000 m.This article summarizes and compares the various existing long-term transmission methods and various ocean data observation systems,combines the technical indicators of the project and the advantages and disadvantages of various methods,according to the needs of real-time display of some data and the need to carry a camera for observation.The optical fiber is selected as the transmission medium under the requirement of ensuring the transmission rate.The system uses FPGA as the core timing control chip,and uses RS232 digital interface to realize the data acquisition of temperature,depth,salinity,conductivity and threedimensional attitude.It uses the dual-channel synchronous analog-to-digital conversion chip ADS8353 to meet the requirements of the two-dimensional vector MEMS turbulence sensor.Synchronous collection of X and Y data.Because the received digital signal and the analog-todigital conversion acquisition rate are different,a variable-length hybrid frame transmission structure is designed to realize the full data acquisition and real-time transmission of sensors with different transmission rates.The data is completed by designing a matching frame structure Storage.The design circuit and data frame structure transmission mode has been applied to the pool and reservoir experiment,and it has the test conditions in the marine environment.The experimental results show that there is no garbled phenomenon in the real-time data transmission and storage readback data,which verifies the reliability of the design.It has certain application value for multi-parameter data synchronization acquisition device.