| As improvement of people’s living standard, outdoor adventure climbing sport is becomingmore and more popular in China, but many safety accidents occurred oft during climbing. Thus,peoples are in urgent need of monitoring equipment, which can provide real-time wearer’s keyphysiological and geographical information, and can also early warn immediately. In this paper,targeting market demand on information collection for outdoor adventure rescue, we researched thetechnology of key related information collection for outdoor rescue, and designed new modelelectronic sphygmomanometer and high-precision compass, which could be applied in the outdooradventure field. Under combination together with above mentioned two parts technology we builtthe monitor for outdoor adventure rescue.The paper is set in outdoor information monitoring and remote medical care, and then showsthe recent domestic and international new technology development situation and background inoutdoor information monitoring area. Moreover, execution proposal of key signal samplingtechnology is introduced, and compared with advantages and disadvantages of different proposal, inorder to put forward a key signal sampling proposal in the paper. Information collection is the coretechnology of outdoor rescue and monitoring equipment. According to the topic and requirement inthe paper, the key signal to be collected includes blood pressure, heart rate, movement direction andmovement posture and so on. Signals of blood pressure and heart rate are physiological signals,which can be detected by dynamic electronic sphygmomanometer; movement direction andmovement posture are geographic signals, which can be detected by geographic informationmonitoring module i.e. high-precision electronic compass. Dynamic electronic sphygmomanometeris designed based on blood pressure measurement through measurement of pulse wave transmissionspeed, and high-precision compass is design based on geomagnetic navigation theory.Then, hardware and software design process of the dynamic electrical sphygmomanometer anddigital compass, and encountered difficulties and solution are described. The stabile acquisition ofpulse wave signals and calculation of signal phase difference are the main difficulties in the designof dynamic electrical sphygmomanometer. With comparison of different pressure-sensitive sensormaterial, PVDF membrane is selected as pulse signal acquisition material, and finally differentialpulse wave sensor is innovated designed. Digital compass is based on geomagnetic navigationtheory, and removal of hard and soft iron interference is its design challenge, and the accuracy isincreased ultimately within 2°through self-calibration algorithm.Finally, the monitor for outdoor adventure rescue is designed based on the non-invasivesphygmomanometer and 3-axis electronic compass, which is also implemented and developed by the ARM embedded platform. A graphical user interface (GUI) is designed and the real-time datacommunication between various modules is realized based the embedded platform with the coreprocessor S3C2440. In addition, the data transmission format and the interface are designed forremote communication in the future.First, the capital cost is reduced greatly through the independent design of the key modules.Second, the advanced signal sampling scheme and the optimal digital signal processing algorithmare used to guarantee the precise and real-time measurement of different parameters. And then theoptimal embedded platform is selected to real-time output the digital information dynamically andto achieve a friendly interactive interface. In addition, the data transmission format and the interfaceare designed for the remote communication and network construction of outdoor adventure rescuein the future. Finally, the whole system focuses on the application in the outdoor adventure rescuearea, moreover, dynamic electronic sphygmomanometer and high-precision electronic compass canbe used independently as well, and it must have very good application prospect. |
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