Device-Free Object Detection Using Wireless Beamforming
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Solution Overview
Problem
Device-free detection methods face challenges in achieving high detection accuracy without increasing costs, particularly when detecting objects without special devices like antennas, due to small changes in the propagation environment.
Innovation Solution
The method employs a beamforming function in wireless communication systems to detect objects within a detection area by using wireless transmission and reception devices that transmit and receive radio signals with predetermined beam patterns, and analyze the received signal strength to determine object presence and location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of wireless base stations and wireless terminals is increased to improve detection accuracy, then detection accuracy is improved, but system cost increases
Solution Approach 1:
The patent changes the parameter of beamforming from conventional communication use to object detection use. By utilizing the beamforming function already present in wireless communication systems and repurposing it for detection purposes, the system achieves high detection accuracy without needing to increase the number of base stations or terminals. The beam patterns and beam identifiers become the basis for detecting object presence and location.
2Device complexity
If device-free detection is used to reduce system complexity, then device portability is improved, but detection accuracy deteriorates due to small propagation environment changes
Solution Approach 1:
The patent introduces beam identifiers as an intermediary element that mediates between the wireless signal and the detection process. The beam identifiers, which are already generated by the beamforming function in wireless communication systems, serve as a bridge to enable accurate object detection without requiring objects to carry special devices. This intermediary allows the system to detect objects based on beam pattern changes while maintaining system simplicity.
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
This approach enables high detection accuracy while preventing cost increases by leveraging the beamforming function in wireless communication systems for device-free object detection.
Implementation Method 1
a beamforming technique that controls directivity of radio waves
Implementation Method 2
measures received signal strength for each of the beam patterns
Data Source
AI summary
A wireless transmission device transmits a radio signal with a plurality of beam patterns and outputs transmission beam identifiers corresponding to the beam patterns to an object detection device, a wireless reception device receives the radio signal transmitted by the wireless transmission device with a plurality of beam patterns, measures received signal strength for each of the beam patterns and outputs reception beam identifiers and the received signal strength to the object detection device, and the object detection device detects an object within a detection area on the basis of the transmission beam identifiers, the reception beam identifiers and the received signal strength. This enables device-free object detection by utilizing a beamforming function, so that it is possible to achieve high detection accuracy while preventing increase in cost.