A Marine Environmental Monitoring System Based On Wireless Sensor Networks

The marine enviromental monitoring system is the most importantapplication in the field of wireless sensor networks marine monitoring.The thermohaline,deep, flow, PH, dissolved oxygen and other sensorswas placed in the distribution of the waters to real-time monitoringmarine information. And processing the collected data, sent data to theremote monitoring center to stored and display from satellite signals.Compared to other monitoring systems, The real-time monitoring marinesystems have many advantages, such as relatively inexpensive sensornodes, highly independence, highly accuracy.However, in the field of real-time monitoring ocean system, becauseof the sensor nodes generally use batteries or solar power, so the energyof its is very limited, life is not long, and the battery can not be rechargedor replaced. And the magnitude of marine monitoring, a wide range ofcommunications leading to faster energy consumption, thus reducing theenergy consumption of the sensor is the main problem of the presentstudy. Energy-saving strategies in wireless sensor networks is that to minimize power consumption sensor networks and ensure the authenticityof the data. Data acquisition, signal processing and data communicationare the three main stages of consumption in wireless sensor network.The main way to reduce energy consumption is that the topologycontrol in data communication and node energy data control in signalprocessing. Topology control technology have great significance forwireless sensor networks in improve network energy efficiency, improvethe efficiency of network communication, improve efficiency, andimprove the routing protocol scalability and reliability of the network andother aspects. Practical and efficient topology control technology not onlycan greatly save wireless sensor network energy consumption ininformation communication, but also played a good supporting role innetwork encryption, data integration and node localization. The wirelesssensor network node energy control technology is that ensure theauthenticity of data, reliability, continuity and improve the originally dataencoding protocol to reduce the transmission data symbols and energyconsumption in the encoding/decoding process. Compared to thetopology control technology, node energy control technology had morespace can be studied, because of there have less study in the field and nouniform standard.Therefore, this article research on node energy control technology, cited several typical sensor nodes coding algorithm. Such as no encodingsent directly, LDPC codes, Growth codes, random linear code, binarycode, etc. And select a real-time decrease transmit data to achieve theeffect of reducing energy consumption binary difference compressalgorithm. Differential binary coding longitudinal cut the sensor collectdata to reduce the signal bits and the energy consumption of sensor nodes.In addition introduce the differential encoding to improve noise immunity,reduce the impact of error codes to the entire monitoring system. Theencoding algorithm is relatively simple and easily implemented inhardware. Finally based on raspberry pi, ADCP doppler instrument,temperature and humidity sensors build a small vessel stent damperreal-time monitoring system, which could efficiently and independentlyaccomplished the monitoring mission.