Research On Measurement System Of Underwater Acoustic In-situ Observation Device

The South China Sea has become an important sea area for China to provide mineral resources,biological resources,tourism resources and shipping in the 21 st century.The establishment of a marine survey network to monitor the ocean from top to bottom has important scientific research value and practical application significance for ship navigation,resource exploration and exploitation,and low-quality disaster prevention.Seabed in-situ observation system is the basic system of the whole ocean observation network,and its research is the difficulty and hotspot of ocean technology development.In order to satisfy the in-situ observation of the acoustic characteristics of seabed sediments,a seabed in-situ acoustic observation device is designed to realize the measurement of the motion state of the observation device,the measurement of the acoustic physical characteristics of seabed sediments and the measurement of the environmental state of seabed water,thus providing system equipment for the exploration of seabed resource distribution and seabed state change.In this paper,the measurement system of undersea acoustic in-situ observation device is designed and studied.The main work is as follows:1.The overall scheme of hardware unit and software unit of the system are designed.The selection of core control chip,communication mode and data storage mode,temperature,salinity,depth and other major sensors are designed.The research scheme and simulation analysis of acceleration sensor detecting bottom contact and penetration depth are designed.2.The overall hardware unit of the measurement system is designed.The design of5 V,12V boost circuit,sensor communication circuit and host computer communication circuit and the selection of control chip in the power supply circuit are completed.The hardware circuit PCB design is completed by Altium Designer.3.The overall software unit of the measurement system is designed.The program function logic design of the content arrangement of the upper computer login interface and the main program interface and the background is realized.The main program of the lower computer,the communication program and other module programs are designed and the specific program logic is designed.4.The method of penetration depth and bottom touch detection is proposed and verified.The depth calculation method based on acceleration sensor is simulated to verify that the calculation error is less than 3%;the design simulates the process of penetration of seabed in-situ measuring equipment into sediments,and the detection error of penetration depth is about 10%.At the same time,the scheme of acceleration detection touching bottom is verified to be feasible.Through research and design,the measurement system of the in-situ acoustic observation device for the measurement of the device's motion state,the measurement of the physical characteristics of the seabed sediments,and the measurement of the environmental state of the seabed water has been established to solve the problem that the penetration depth of the seabed cannot be effectively measured.Through functional experiments,the measurement function of the measurement system of the in-situ acoustic observation device on the seabed was verified.