Design And Implementation Of Offshore Cable Observation System

In order to prevent marine disasters, real-time monitoring of the offshore marine environment is very meaningful, especially the data of the ocean dynamic environment includes ocean currents, waves, sea temperature, sea salinity and so on. The long-term, real-time data provided by the ocean observation system is helpful to improve the prediction of marine disasters and the capabilities of warning, so as to minimize the loss of life and property. In many marine environment monitoring methods, submarine cable observation can stably monitor ocean internal environment for long time and the monitoring data has the more scientific value.This paper mainly introduces the process of the implementation of offshore cable observation system, including the design of seabed observation platform, the design of shore monitoring station and the design of remote monitoring center. The seabed observation platform connects shore monitoring station through 1Km submarine cable. After the time of the completion of each part of the hardware and software design of each part, they will be integrated into a complete set of the offshore marine environment online monitoring system by system integration method.Seabed observation platform manages each sensor by the mode of distributed management based on CAN bus, design power distribution board to provide uniform interface of the power supply for each device. Each sensor has a SCM system as CAN node, which adopts the chip of AT90CAN128 with a integrated CAN controller for CPU. The SCM system can convert RS232 protocol data to CAN protocol data or convert CAN protocol data to RS232 protocol data, as well as manage the power of sensor. At the same time, the platform adopts double redundancy embedded ARM as control core, and adopts multi-threaded control programming which is mainly responsible for the communication between the ARM embedded and each CAN node, the acquisition of sensor data, the real-time upload of sensor data. Through all kinds of tests platform can work stably for a long time. Shore monitoring station convert AC 220V50HZ into different DC voltages by AC/DC converter for the energy supply of shore control system and seabed observation platform, and transfers 380V DC to the seabed observation platform. The shore control system adopts PCM-3363 as the control core, communicates with the remote monitoring center through the GPRS or CDMA DTU or Beidou terminal which is mounted on the serial port. Two bridges provide the communication velocity of 5Mbps for the communication between the seabed observation platform and the shore control system. The multi-threaded control program of the shore control system complete information transfer. The core of remote monitoring center is the control program based on GUI.The paper is divided into seven chapters. The first chapter introduces the research background of the observation of the offshore marine, the domestic and foreign development status of the observation of the offshore marine, the development trend of marine observation, and the structure of this paper is briefly introduced. The second chapter describes the overall of this system. The third chapter introduces the overall structure of seabed observation platform, mainly includes the sensor subsystem, energy supply and distribution subsystem, communication and power management subsystem, data acquisition and control subsystem, and then introduces concrete implementation of each subsystem. The fourth chapter mainly introduces the energy supply system and shore control system of the shore monitoring station. The fifth chapter mainly introduces the control program based on GUI. The sensor sampling scheme and remote management of each sensor power module are also briefly introduced. The sixth chapter introduces the system integration test. The last chapter mainly summarizes the work and prospect.