Old people fall detection and alarm system based on 3D (3-dimensional) accelerometer and gyroscope

An accelerometer, fall alarm technology, applied in alarms, instruments, diagnostic recording/measurement, etc., can solve the problems of high dependence on the environment and high misjudgment rate

Active Publication Date: 2013-04-10
BEIJING UNIV OF TECH
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Problems solved by technology

The traditional method of detecting the fall of the elderly based on acceleration has a high misjudgment rate; w

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  • Old people fall detection and alarm system based on 3D (3-dimensional) accelerometer and gyroscope
  • Old people fall detection and alarm system based on 3D (3-dimensional) accelerometer and gyroscope
  • Old people fall detection and alarm system based on 3D (3-dimensional) accelerometer and gyroscope

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Embodiment Construction

[0024] The invention uses a 3D accelerometer and a gyroscope to obtain 3D acceleration and angular velocity data of the activities of the elderly. The 3-axis accelerometer uses ADXL345 (Analog Devices Inc.), and its measurement range is ±16g; the gyroscope uses ITG3200 sensor (InvenSense Inc.), and its measurement range is ±2000° per second. The size of the motherboard is 22mm×52mm×1mm (width×length×thickness), and the microcontroller processor is ATmega328P-AU (Atmel Co.). The Bluetooth module adopts BC04-B of CSR Company, which adopts Class2 standard, the effective communication distance is 10 meters, and the baud rate is 115200bps. The sampling frequency of the sensor module is 100Hz.

[0025] The smart phone runs Android2.3 system, and runs a fall detection algorithm based on thresholds and so on. The algorithm is based on a human activity model of 3D acceleration and angular velocity. attached figure 1 Shown is the acceleration model of human activities, the accelerat...

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Abstract

The invention relates to an old people fall detection and alarm system based on a 3D (3-dimensional) accelerometer and a gyroscope, belonging to the field of electronic information. The old people fall detection and alarm system is characterized in that a human body motion activity sensing module which is integrated with the 3D accelerometer, the gyroscope, a bluetooth chip and a microprocessor is embedded into a vest which is put on by old people, the 3D acceleration and the angular speed data of the activities of the old people are acquired in real time, the data of the activities is transmitted to a smart mobile phone in which fall detection software runs through bluetooth; the fall detection software automatically calculates the corresponding resultant acceleration alpha and the corresponding deflection angle theta according to the received activity data; and when the resultant acceleration alpha is larger than a resultant acceleration threshold alpha T and the deflection angle theta is larger than a deflection angle threshold theta T, a fall which occurs is judged, an alarm is given out by calling a designated contact person or transmitting a short message containing the position of the old people to the designated contact person through the mobile phone. The resultant acceleration threshold alpha T and the deflection angle threshold theta T used by the fall detection software are obtained by adopting a Bayesian algorithm. The fall detection and alarm system has the characteristics that the detection accuracy is high and the system is convenient for the old people to use.

Description

technical field [0001] In the field of electronic information, a method and device for detecting and alarming falls of the elderly Background technique [0002] The aging of the population in today's society is becoming increasingly serious, and the health of the elderly has become a hot spot of social concern. Every year, medical expenses caused by falls in the elderly worldwide exceed 1 billion US dollars. The traditional method of detecting the fall of the elderly based on acceleration has a high misjudgment rate; while the method of detecting the fall of the elderly based on the camera has a high dependence on the environment. The invention integrates 3D acceleration and gyroscope sensors, bluetooth chips and microprocessors into vests worn by the elderly, collects the 3D acceleration and angular velocity data of the elderly's activities in real time, and sends the activity data to the operating system based on Threshold fall detection software for smartphones; after d...

Claims

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Application Information

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IPC IPC(8): A61B5/11G08B21/04
Inventor 何坚纪应龙李杨胡晨
Owner BEIJING UNIV OF TECH
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