Design Of Expendable Conductivity Temperature Depth Survey Data Processing System

After the recovery of marine equipment to the ground,it is needed to easily transfer data to the general computer for further data processing and analysis.Compared with detection results of the original data,the formation of the background fitting and processing chart gives a more intuitive impression.At present,most of the ocean measurement data background processing system are applied with PC,while ordinary computer is not suitable for harsh environment of sea trial.The general use of foreign naval is reinforcement computer which can adapt to a variety of harsh environment.As the reinforcement computers are industry-specific computers which are expensive,so the application is not very common. Therefore,the study of more economical,portable marine surveying data processing system has important social and economic significance.On the base of analysing the development status of survey data processing system,this paper designs a kind of expendable conductivity temperature depth survey data processing system.It uses high-performance ARM Cortex-M3 32-bit ARM7 RISC core microprocessor STM32F103VB.In this design,it receives data from Lower computer using RS-232 interface.The system uses SD memory card to store data,and uses LCD screen to display the dynamic curves.This design uses High Capacity SD Memory Card (SDHC) of 8GB.In order to facilitate reading the data of the card in operating system and facilitate further analysis and processing of data,we have to build FAT32 file system on the SDHC.It completes the hardware design and the function module debugging. It discusses several common SD card command format and response format of the corresponding instructions.In addition,the method of reading and writting SD memory cards is provided.It also points out the different between SD1.x and SD2.0,and describes the structure of FAT file system and the composition of the various parts.The basic principles of FAT file system is also described.It lists the characteristics of the file system,design goals of file system,and the overall design framework.The functions of each section containing is descript one by one.Based on this,it describes the initialization of LCD and the method of displaying points,lines and characters.It describesμC/OS-II porting in STM32F103VB and problems that is needed to attend.A few tasks is successfully added.Finally,the overall debugging of the system is made.As shown in the results,the system is reliable.