Reference Time Generator Using QOT-Based Atomic Clock Selection
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Solution Overview
Problem
Current clocking devices, including atomic clocks, have limitations in accuracy and stability, which can lead to imperfect timekeeping in modern technologies such as GPS and telecommunications networks.
Innovation Solution
A reference time generator that employs multiple clock sources and a quality of time (QOT) metric to select the most accurate clock source at any given time, using a defined absolute reference time stamp (DARTS) for improved time generation, enabling selection between different clock sources like cesium, rubidium, and hydrogen atomic clocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single atomic clock source is used, then the device complexity is reduced, but the timekeeping accuracy and stability deteriorate
Solution Approach 1:
The patent combines multiple atomic clock sources (cesium, rubidium, hydrogen) into a single reference time generator system. The system merges these different clock sources and uses a selection mechanism to choose the best performing clock at any given time, achieving higher accuracy than any single clock could provide alone.
Solution Approach 2:
The system dynamically selects between different clock sources based on real-time performance metrics. The clock selection is not static but adapts to changing conditions, allowing the system to optimize timekeeping accuracy by switching to the best performing clock source as conditions change.
2Reliability
If multiple clock sources are used, then the timekeeping accuracy is improved, but the device complexity increases
Solution Approach 1:
The system implements feedback through the quality of time (QOT) metric, which continuously monitors the performance of each clock source. This feedback mechanism allows the system to assess clock performance and make informed decisions about which clock to use, improving reliability while managing complexity through automated evaluation.
Solution Approach 2:
The reference time generator performs self-evaluation and self-selection of clock sources based on the QOT metric. The system automatically monitors its own clock sources and selects the best one without external intervention, improving reliability while keeping the management process automated and relatively simple.
3Measurement precision
If a single clock source is used, then the device complexity is reduced, but noise and jitter increase
Solution Approach 1:
The system combines multiple clock sources to provide a pool of time signals. By merging these sources and selecting the best one based on QOT metrics, the system reduces the noise and jitter that would be present in a single clock source, achieving cleaner time signals.
Solution Approach 2:
The system changes the operational parameters by switching between different clock sources based on their real-time performance. This parameter change strategy allows the system to avoid the degradation of signal quality (noise and jitter) that occurs when relying on a single clock source.
Data Source
AI summary
A reference time generator including a first clock source including a reference synthesizer and cesium atomic clock configured to produce a cesium reference signal and a cesium QOT metric, a second clock source including a reference synthesizer and rubidium atomic clock configured to produce a rubidium reference signal and a rubidium QOT metric, and a circuit for selecting from the clock sources one reference signal based on the best QOT metric.