Ultrasonic Access Control for Precise Reader Location Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing access control systems using Bluetooth technology face challenges with high power consumption, reduced credential detection range, and inaccurate position detection of mobile devices, leading to security issues and inefficient door access control.
Innovation Solution
An access control system utilizing ultrasonic technology in conjunction with Bluetooth to transmit unique identifiers and proximity signals, enabling precise location detection and secure door access by distinguishing between multiple locks and identifying user intent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If Bluetooth technology is used for credential communication, then wireless communication capability is provided, but power consumption increases and credential detection range is reduced
Solution Approach 1:
The patent introduces ultrasonic waves as an intermediary communication medium between the access control device and mobile device. The ultrasonic transmitter emits ultrasonic waves that carry credential data, which are then received by the mobile device's microphone. This intermediary ultrasonic communication method reduces the power consumption compared to continuous Bluetooth transmission while extending the effective detection range through acoustic wave propagation.
2Measurement precision
If Bluetooth credential detection is used, then wireless access control is enabled, but position detection accuracy deteriorates and false credential detection increases
Solution Approach 1:
The patent uses ultrasonic frequency modulation as an analog of 'color changes' to encode different credential information. Different ultrasonic frequencies or frequency patterns represent different credentials or credential types, enabling the system to distinguish between multiple credentials and accurately identify the intended one, thereby improving both position detection accuracy and reducing false detections.
3Area of stationary object
If multiple credential readers are deployed in a facility, then coverage area increases, but credential identification accuracy decreases
Solution Approach 1:
The patent segments the credential identification process by using unique ultrasonic frequency signatures for each access control device. Each reader/lock combination transmits or responds with a specific frequency pattern, allowing the mobile device to identify which specific reader it is communicating with even when multiple readers are present. This segmentation of identification through frequency coding maintains high accuracy across wide coverage areas.
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
The ultrasonic solution enhances precision in door access control by accurately identifying the location of the reader/lock, enhancing security and efficiency in securing door access control systems, enhancing user intent detection and reducing false positives.
Implementation Method 1
a first signal in a first protocol over ultrasound from the reader device to the mobile device
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A system including a reader device and a mobile device having a user credential. The reader device includes an ultrasonic transmitter configured to transmit an identifier, and a wireless transceiver configured to receive information from and transmit information to the mobile device. The identifier is configured to be received by a microphone of the mobile device. The mobile device may determine a position of the mobile device based on the identifier.