Radio-Controlled Watch Leap Second Correction
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Solution Overview
Problem
Radio-controlled watches that receive time information from satellites, such as GPS, often face challenges in performing leap second corrections due to infrequent transmission of leap second information, leading to potential inaccuracies in Coordinated Universal Time (UTC) synchronization.
Innovation Solution
Incorporating storage for leap second correction values, display mechanisms for user instruction, and update functionality to manage expiry dates, allowing manual correction and validation of leap second information, even in the absence of satellite updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radio-controlled watch relies on satellite signals for leap second correction, then time synchronization accuracy is improved, but the frequency of receiving leap second information decreases leading to potential time inaccuracies
Solution Approach 1:
The watch pre-stores leap second correction values and their corresponding expiry dates in memory before they become invalid. This preliminary storage allows the watch to maintain accurate time synchronization even when satellite signals are not immediately available, as the stored correction data can be applied until its expiry date.
Solution Approach 2:
The expiry date information acts as an intermediary mechanism between the satellite signal and the timekeeping system. By tracking when stored leap second correction values expire, the watch can determine when new correction data is needed, bridging the gap between infrequent satellite updates and continuous time accuracy requirements.
2Measurement precision
If the radio-controlled watch continuously monitors for leap second information from satellites, then time accuracy is maintained, but power consumption increases
Solution Approach 1:
Instead of continuous monitoring, the watch employs periodic action by only attempting to receive leap second information from satellites when the currently stored correction value reaches its expiry date. This periodic reception strategy maintains time accuracy while significantly reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The watch's control unit automatically manages the leap second correction process by monitoring expiry dates and initiating satellite signal reception only when necessary. This self-service mechanism eliminates the need for continuous user intervention or constant active monitoring, optimizing power usage while maintaining accuracy.
3Reliability
If the radio-controlled watch stores leap second correction values with expiry dates, then time synchronization reliability is improved, but device complexity increases
Solution Approach 1:
The watch pre-stores not only leap second correction values but also their corresponding expiry dates in memory. This preliminary storage of metadata (expiry dates) alongside the correction values simplifies subsequent management by providing clear validity indicators, reducing the complexity of determining when updates are needed.
Solution Approach 2:
The expiry date information provides feedback to the control unit about the validity status of stored correction values. This feedback mechanism automates the decision-making process for when to seek new correction data, improving reliability while managing complexity through systematic data tracking.
Data Source
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AI summary
Provided is a radio-controlled watch capable of performing leap second correction even when information on a leap second is not received from a satellite. Provided is a radio-controlled watch that adjusts time by receiving a signal containing time information from a satellite, the radio-controlled watch being configured to: store a leap second correction value to be used for leap second correction with respect to the time information; display a numerical value corresponding to the leap second correction value; receive an instruction operation of changing the leap second correction value from a user in a state in which the numerical value is displayed; and change the leap second correction value in response to the received instruction operation.