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Fall-down detection method and system

A technology of phase difference and signal flow, which is applied in the direction of transmission system, scattering propagation system, baseband system components, etc.

Active Publication Date: 2016-09-07
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if the activity is cut out, distinguishing falls from all other everyday activities is akin to searching for a solution in an infinite problem space, which remains challenging

Method used

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  • Fall-down detection method and system
  • Fall-down detection method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] Embodiment 1. A method for fall detection, comprising:

[0158] receiving a first WiFi signal stream passing through the environment through a first receiving antenna;

[0159] receiving a second WiFi signal stream through the environment via a second receive antenna;

[0160] Determine the physical layer channel state information flow of the first WiFi signal flow, that is, the first CSI flow;

[0161] Determine the physical layer channel state information flow of the second WiFi signal flow, that is, the second CSI flow;

[0162] determining the phase difference between the corresponding states at the same moment in the physical layer channel state information flow of the first WiFi signal flow and the physical layer channel state information flow of the second WiFi signal flow, that is, the CSI phase difference, so as to form CSI phase difference stream; and

[0163] A fall event is determined according to the CSI flow and the CSI phase difference flow.

Embodiment 2

[0164] Embodiment 2. According to the embodiment described in embodiment 1, it is further configured to determine a fall event according to the first and second CSI streams.

Embodiment 3

[0165] Embodiment 3. The method for fall detection according to embodiment 1, further comprising transmitting a WiFi signal stream into the environment through a transmitting antenna of a WiFi transmitting device, wherein the first WiFi signal stream is consistent with the The second WiFi signal stream originates from the WiFi signal transmitted by the transmitting antenna of the WiFi transmitting device.

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Abstract

The invention relates to a fall-down detection method and system. The fall-down detection method includes receiving a first WiFi signal flow passing through the environment via a first reception antenna; receiving a second WiFi signal flow passing through the environment via a second reception antenna; determining the physical layer channel state information flow, namely a first CSI flow, of the first WiFi signal flow; determining the physical layer channel state information flow, namely a second CSI flow, of the second WiFi signal flow; determining the phase difference, namely the CSI phase difference, between the physical layer channel state information flow of the first WiFi signal flow and the physical layer channel state information flow of the second WiFi signal flow in the corresponding state at the same time to form a CSI phase difference flow; and determining the fall-down event based on the CSI flows and the CSI phase difference flow.

Description

technical field [0001] The invention relates to the field of fall detection, in particular to a real-time non-contact fall detection method and system using commercial WiFi equipment. Background technique [0002] Falls have become a major cause of fatal and non-fatal injuries among older adults in modern society. For elderly people living alone, 50% of falls occur in their own homes, so timely and automatic fall detection has long been an important research goal in the field of assistive technology for the aged. Various technologies ranging from wearable sensor-based, environmental device-based to computer vision-based schemes have thus been proposed and studied. Approaches based on wearable sensors are among the first techniques developed for fall detection. Since the accelerometer-based method proposed by Lord and Colvin in 1991, various types of sensors for fall detection have been developed in the past decades, ranging from gyroscopes, air pressure sensors, RFID to se...

Claims

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Application Information

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IPC IPC(8): H04B17/309
CPCH04B17/309G08B21/043H04B7/22H04L25/02A61B5/1117H04B17/336H04B7/0413
Inventor 张大庆王皓王亚沙
Owner PEKING UNIV
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