Reference Signal Synchronization for Distributed Sensor Recording
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Solution Overview
Problem
Existing signal synchronization methods rely on centralized synchronization using a common clock or satellite timing, which can be limited by radio link range and prone to interference, and installation of signal cables is costly and logistically challenging.
Innovation Solution
A system that uses sensor devices to record both informational and reference signals independently, allowing for post-recording synchronization using a reference signal, such as an FM radio station or optical signal, enabling flexible deployment and synchronization of multiple sensors without requiring precise initial alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If centralized synchronization using common clock or satellite timing is used, then signal synchronization accuracy is improved, but radio link range is limited and interference susceptibility increases
Solution Approach 1:
The patent introduces a reference signal as an intermediary carrier that transports timing information from a central source to multiple sensor devices. Instead of direct centralized control, the reference signal acts as a mediator that enables autonomous synchronization at each device without requiring continuous radio communication links, thereby extending operational range and reducing interference susceptibility.
Solution Approach 2:
The system performs preliminary action by embedding timing information within the reference signal itself before distribution to sensor devices. Each device records the reference signal along with its sensor data, capturing the timing relationship in advance. This preliminary encoding of synchronization information eliminates the need for real-time centralized coordination during data collection.
2Reliability
If signal cables are installed for synchronization, then synchronization reliability is improved, but installation cost and logistical complexity increase
Solution Approach 1:
The patent replaces the mechanical/cable-based synchronization system with an electromagnetic signal-based system. Instead of physically connecting sensor devices through cables to a central timing source, the system uses wireless reference signals that can be received by all devices independently. This substitution eliminates the need for complex cable installation while maintaining synchronization reliability through the recorded reference signal timestamps.
3Adaptability or versatility
If multiple sensors are deployed independently without precise initial alignment, then deployment flexibility is improved, but signal synchronization becomes difficult
Solution Approach 1:
Each sensor device autonomously records the reference signal alongside its sensor data, creating a self-contained timing reference at each location. During post-processing, the system automatically calculates time shifts by comparing reference signal arrivals at different devices, enabling independent deployment without requiring manual alignment or precise initial positioning of sensors.
Data Source
AI summary
An example method includes: recording, at a first sensor device, (i) a first informational signal as detected at the first sensor device; and (ii) a reference signal as detected at the first sensor device; recording, at a second sensor device (i) a second informational signal as detected at the second sensor device; and (ii) the reference signal as detected at the second sensor device; determining a time shift between the reference signal as recorded by the first sensor device and the reference signal as recorded by the second sensor device; and applying the determined time shift to the second informational signal to time-align the first informational signal and the second informational signal.