The Design For The Oceanic Hydrology And Meteorology Automatic Observation System Based On The CAN Bus

The ocean is all lives'cradle. Along with the human culture development, people thirst for cognition the ocean and reasonable use marine resources. Because of the swift development of the information technology, the electronic technology and the computer control technology, the ocean detecting instruments and equipments obtain the considerable progress. But in our country the seashore observation stations'development level has a large disparity with the international advanced level. For the sake of better observation the oceanic hydrological and meteorological elements, we design a set of technological advanced oceanic meteorology and hydrology automatic observation system to be imperative.The present dissertation is devoted to the development of oceanic meteorology and hydrology automatic observation system with higher integration level more advanced technical higher reliability and more advantageous for the maintenance. This article according to the existing seashore observation station's shortcomings and the insufficiencies uses the present advanced SOPC technology and very mature CAN bus technique, proposes the based on the CAN bus oceanic hydrology and meteorology automatic observation system's overall solution.This dissertation first discusses principles of the oceanic hydrology and meteorology automatic observation system, and then compares and demonstrates in detail the designing and actualization scheme of the system. Finally, FPGA chip is chosen as the hardware developing platform for the project, and SOPC technology is used to conduct cooperative designing of software and hardware, takes by the CAN bus to connect the various sensor nodes and the central data processing part to compose a network, so as to meet the demand of high performance processing and flexibility, and meet the goal to lower the cost. This system chooses EP2C20 chip of the Cyclone II device family of Altera as the main controller of the system, AT90CAN128 as the sensor node's control chip. And this dissertation also proposes the circuit designing of the main function module.The best important issue discussed in this dissertation is to make this system's overall construction unprecedented change. Firstly, using the present advanced FPGA embedded technology, uniting its supported the SOPC technology, integrating the massive digital logic module which the system needs on one piece of FPGA chip. The dissertation has completed the central data processing system hardware platform designed function IP Cores, realized numerous data processing duties, simultaneously there are several man-machine connection ways such as LCD, keys and the interface of the transportable storage device. Secondly, introducing the CAN bus that presently widespread application in the automobile profession to the oceanic hydrology and meteorology observation system, taking the AVR monolithic integrated circuit AT90CAN128 as the core chip to design intelligence sensor node circuit, with the central data processing part composition communication network, has simplified the system structure, formulating the data communication protocol. Thirdly, Designing many kinds of choice wireless communication ways, designing interface in central data processing part for each kind of communication way, has expanded the application scope of the system.Finally, characteristics of this system are summarized based on the actual result of the research and development of this system, and the future designing work is also prospected.