UWB Reader Clock Synchronization via Pulse Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Real-time UWB locating systems face challenges in achieving precise synchronization among readers in a simple, versatile, and cost-effective manner, as existing methods require significant computational effort or may not suit the requirements of simple readers in real-time locating systems.
Innovation Solution
The system employs a master UWB reader that transmits UWB pulses periodically, with slave readers adjusting their clocks to synchronize with the master reader using the received pulses, leveraging CDMA or CSMA-CA techniques, and utilizing software-based synchronization protocols like IEEE 1588 PTP or NTP for coarse synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing synchronization methods are used, then synchronization accuracy can be achieved, but computational effort and system complexity increase significantly
Solution Approach 1:
The system uses the existing UWB communication infrastructure to provide synchronization services. Readers synchronize by detecting and processing each other's normal location signals without requiring separate synchronization hardware or protocols. The synchronization function is embedded within the existing communication framework, allowing readers to self-synchronize using routine signal exchanges.
Solution Approach 2:
The UWB communication signals serve dual purposes: both location determination and clock synchronization. The same signals used for measuring distance and position are simultaneously used for time synchronization, eliminating the need for dedicated synchronization signals or separate functional modules.
2Measurement precision
If existing synchronization methods are used, then synchronization accuracy can be achieved, but additional hardware resources are required
Solution Approach 1:
The existing UWB transceiver hardware performs both location measurement and synchronization functions. The same antennas, signal processors, and timing circuits used for location tracking are simultaneously employed for clock synchronization, eliminating the need for additional dedicated synchronization hardware.
Solution Approach 2:
The system utilizes its own operational signals for synchronization purposes. Readers detect synchronization information embedded in their normal location signals and use this to adjust their clocks, requiring no external synchronization hardware or additional signal generation equipment.
3Ease of manufacture
If simple readers are used, then cost and complexity are reduced, but synchronization capability is compromised
Solution Approach 1:
Simple readers achieve synchronization by detecting and processing signals from other readers in the network. Each reader contributes to the synchronization of others, distributing the synchronization function across all devices rather than requiring a dedicated master synchronizer, thus maintaining reliability while keeping individual reader complexity low.
Solution Approach 2:
Readers continuously monitor the arrival times of signals from other readers and adjust their local clocks based on detected timing deviations. This feedback mechanism enables automatic synchronization without complex preprocessing or specialized hardware, maintaining both simplicity and reliability.
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
In a UWB real time locating system, UWB readers (12) are synchronized by adjusting a clock of a UWB slave reader (12) until the UWB reader (12) receives each UWB pulse (34) of a sequence of UWB pulses (34) having a predetermined pulse period (Tp) and encoding a master UWB reader unique identifier at an expected time slot (35) within each predetermined pulse period (Tp), the expected time slot (35) being related to the distance between the UWB tag reader (12) and a master UWB reader (12).