Human Presence Detection via RF Signal Scattering
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Solution Overview
Problem
Existing object detection systems, such as GPS and radar, are less effective indoors and require fiducial elements, which may not be present or functional in all scenarios, and are susceptible to noise and interference, limiting their accuracy and reliability in detecting human presence without additional hardware.
Innovation Solution
A method using a network of transceivers and a computer server to create baseline signal profiles based on wireless communication properties, allowing for the detection of human presence by comparing signal properties in real-time data to these profiles, without the need for fiducial elements, using signal absorption and scattering characteristics in a wireless communication network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar is used for object detection, then detection capability is improved, but susceptibility to noise and interference increases
Solution Approach 1:
The patent replaces traditional radar-based electromagnetic detection with acoustic wave-based detection. The system uses acoustic waves to interact with the target object, detecting changes in acoustic properties (such as reflection, absorption, or transmission) to identify the presence and characteristics of objects. This substitution of the detection medium from electromagnetic waves to acoustic waves provides immunity to electromagnetic interference while maintaining detection capability.
Solution Approach 2:
The patent introduces acoustic waves as an intermediary medium between the detector and the target object. Instead of directly using electromagnetic waves that are susceptible to interference, the system uses acoustic waves as a mediator to probe the target environment. The acoustic waves interact with objects through mechanical vibration and pressure changes, providing indirect but interference-resistant detection of target characteristics.
2Measurement precision
If GPS or Bluetooth beacons are used for location tracking, then location determination is improved, but requirement for fiducial elements increases
Solution Approach 1:
The patent enables objects to be detected and located without requiring them to carry or provide any fiducial elements. The detection system passively senses the presence and location of objects by detecting their acoustic signatures or the acoustic field disturbances they cause. Objects are detected based on their inherent acoustic properties rather than any attached tracking devices, making the system applicable to all objects regardless of their ability to carry electronics.
Solution Approach 2:
The patent extracts the fiducial element requirement from the detection system entirely. Instead of requiring objects to have attached transceivers or fiducial markers, the system detects objects based on their natural acoustic characteristics. This extraction of the fiducial element dependency simplifies the system architecture and expands applicability to objects that cannot or should not carry electronic devices.
3Reliability
If transceivers are attached to objects for tracking, then detection reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The detection system operates passively by sensing acoustic field changes caused by objects. Objects do not need to be actively equipped with transceivers or participate in the detection process. The system automatically detects and tracks objects based on their acoustic presence, making the operation simple and non-intrusive while maintaining reliable detection through continuous acoustic monitoring.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and reliable detection of human presence within a wireless communication network, improving indoor detection capabilities and reducing interference susceptibility, without requiring additional hardware or fiducial elements, and allows for continuous monitoring and location determination.
Implementation Method 1
providing a first transceiver disposed at a first position within a detection area; providing a second transceiver disposed at a second location within the detection area; the first transceiver receiving a first set of wireless signals from the second transceiver via the wireless communications network
Implementation Method 2
using signal absorption and scattering characteristics in a wireless communication network
Implementation Method 3
using signal absorption and scattering characteristics in a wireless communication network
Data Source
AI summary
Systems and methods for detecting the presence of a body in a network without fiducial elements, using signal absorption, and signal forward and reflected backscatter of radio frequency (RF) waves caused by the presence of a biological mass in a communications network.