UWB Access Reader Module for Multipath-Resistant Credential Ranging
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Solution Overview
Problem
Current access control systems face challenges in providing robust and efficient authorization and authentication methods, particularly in environments where traditional credential systems may be compromised by interference or multipath fading, and there is a need for more reliable and power-efficient solutions for secure area access control.
Innovation Solution
The implementation of an ultra-wide band (UWB) module within access control systems, which uses short, low-power pulses over a wide frequency spectrum for communication, encoding data via time modulation, and integrates with existing reader systems to enhance authorization and authentication processes, including the use of a battery-powered UWB module that operates independently of external power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional credential systems (RFID) are used for access control, then the system is simple to implement, but the communication is vulnerable to interference and multipath fading
Solution Approach 1:
The patent transitions from narrowband RFID communication to ultra-wideband (UWB) communication, fundamentally changing the frequency spectrum parameters. UWB uses extremely wide bandwidth (typically 500 MHz to 2 GHz) and short pulses, which provides immunity to multipath fading and interference while maintaining system functionality. This parameter change resolves the contradiction by improving communication reliability through physical layer characteristics without requiring complex higher-layer protocols.
2Ease of repair
If the UWB module is integrated into the reader system with external power source, then the system has centralized power management, but the maintenance requires replacing power sources in the reader system
Solution Approach 1:
The patent segments the power management system by providing the UWB module with an independent battery power source, separating it from the reader system's external power source. This segmentation allows the UWB module to be maintained independently - the battery can be replaced without affecting the reader system, significantly easing maintenance operations. The complexity of centralized power management is traded for the simplicity of independent module maintenance.
3Reliability
If UWB communication is implemented for robust authorization, then the authorization process becomes more reliable, but the power consumption increases
Solution Approach 1:
The patent employs periodic pulsed transmission characteristic of UWB technology, where communication occurs in short bursts rather than continuous transmission. The UWB module transmits authorization data using brief pulses across the wide frequency spectrum, consuming power only during these periodic transmission events. This periodic action maintains high authorization reliability through robust UWB communication while significantly reducing average power consumption compared to continuous transmission modes.
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 UWB module provides robust communication resistant to multipath fading and reduces interference, enabling reliable and efficient authorization processes while conserving power and simplifying maintenance by allowing battery replacement in the UWB module rather than the reader system.
Implementation Method 1
uses short, low-power pulses over a wide frequency spectrum for communication, encoding data via time modulation
Data Source
AI summary
A device connectable to a reader of an access control system includes an antenna, an ultra-wide band (UWB) front end circuit, a controller, and a communication link. The (UWB) front end circuit is connected to the antenna to facilitate UWB communication with a credential device. The controller is connected to the UWB front end and configured to perform ranging for the credential device using the UWB communication. The communication link is configured to interface with the reader.