The Elderly Outdoor Monitoring System Based On The Beidou Satellite Navigation System

Both heart disease and accidental falls were the most important threat to the safety of the elderly people. The elderly people could be protected from badly situations by necessary care monitoring devices. The existing monitoring devices were not optimized for the elderly people. The volume was large, the care range was small, expensive and the device interfere the normal life of the elderly people.In this paper, a heart rate monitor and a combination of fall detection monitoring system for the elderly people to get the heart rate were designed. The posture information of the elderly people was get via triaxial acceleration sensor. The location information was get using the Beidou Satellite Navigation module. The data was send to the guardian through the GSM network by the MCU.The elderly care system designed for outdoor sports based on Beidou Satellite Navigation system mainly includes the following aspects.(1) Monitor the heart rate. The weak electric current generated by the heart beaten could be monitored using electrodes. The weak current signal was amplified and filtered. Then the heart rate of the elderly was calculated by using ECG algorithm.(2) Detect the accidental falls. The physical location information of the elderly people was obtained by using the three-axis accelerometer ADXL345. The FIR low-pass filter was used for data processing. The adaptive threshold was used to calculate the fall information.(3) Obtain the location information of the elderly people through the Beidou Satellite Navigation module in the event of emergency situations.(4) Send the important information of the elderly to the guardian timely through the GSM module to protect the lives and safety of the elderly people when some sudden and unexpected situation occurred.(5) The main controller was designed based on the STM32F103 to obtain the heart rate, complete the fall detection, get the location information and send the important data to the guardians.In this paper, an outdoor sports elderly care system was designed based on the Beidou Satellite Navigation System. Real-time heart rate monitoring, motion monitoring, and accidental falls monitoring were designed. All data was sent to the data center and guardians through the GSM/GPRS network to protect elderly people's lives and health safety.