Radio Wave Timepiece Time Acquisition Using Predicted Waveform Patterns
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Solution Overview
Problem
Existing time information acquisition apparatuses for radio wave timepieces face challenges in quickly and accurately acquiring current time due to noise interference and the need for extensive processing times, especially when receiving standard time radio waves with low signal intensity.
Innovation Solution
A time information acquisition apparatus that generates input and predicted waveform data patterns, detects errors, and corrects the base time using a controller to determine the number of predicted waveform data patterns needed, thereby reducing processing time and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the processing circuit performs multiple synchronization processes and code acquisition processes to accurately extract time information from the standard time radio wave, then the time information acquisition accuracy is improved, but the time required to acquire time information increases significantly
Solution Approach 1:
The patent applies preliminary action by pre-generating multiple candidate code strings corresponding to different possible time values before the actual time information acquisition. When the standard time radio wave is received, the system can directly compare the received signal with these pre-prepared candidate codes, eliminating the need for multiple sequential synchronization and decoding processes. This allows the system to quickly identify the correct time information without undergoing repeated synchronization attempts, thereby significantly reducing acquisition time while maintaining accuracy.
Solution Approach 2:
The patent implements dynamics by adaptively adjusting the number of candidate code strings to be generated based on the current time and reception conditions. The system dynamically determines which candidate codes are most likely to be received based on the internal timer's current time display, and generates only those specific candidate codes for comparison. This dynamic approach optimizes the balance between processing speed and acquisition accuracy, avoiding unnecessary processing of unlikely candidates while ensuring the correct code is among those compared.
2Reliability
If the receiver continuously monitors and processes the standard time radio wave signal to ensure accurate time acquisition, then the reliability of time correction is improved, but the energy consumption increases
Solution Approach 1:
The patent applies partial action by generating and comparing only a specific subset of candidate code strings that are most likely to correspond to the current time, rather than continuously monitoring and processing all possible time codes. The system determines the current time displayed on the internal timer and generates candidate codes based on this information, performing processing only on relevant portions of the possible code space. This reduces unnecessary energy consumption while maintaining reliable time acquisition by focusing computational resources on the most probable correct codes.
3Reliability
If the processing circuit performs repeated synchronization processes due to noise interference, then the robustness against noise is improved, but the time required to acquire time information increases
Solution Approach 1:
The patent applies preliminary action by pre-generating all necessary candidate code strings before receiving the standard time radio wave. When noise interference occurs during signal reception, the system can immediately compare the received (potentially noisy) signal against the pre-prepared candidate codes without needing to perform repeated synchronization processes. This approach maintains robustness against noise by ensuring the correct code is among the comparison candidates, while avoiding time loss from repeated processing attempts.
Solution Approach 2:
The patent implements feedback by using the comparison results between the received signal and candidate codes to quickly determine the correct time information. The system receives the standard time radio wave, compares it with pre-generated candidate codes, and immediately identifies the correct time based on the matching result. This feedback mechanism eliminates the need for repeated synchronization processes that would otherwise be required to overcome noise interference, thereby maintaining robustness while significantly reducing acquisition time.
Data Source
AI summary
A time information acquisition apparatus comprises an input waveform data pattern generator configured to sample a standard time radio wave signal in order to generate an input waveform data pattern, a predicted waveform data pattern generator configured to generate predicted waveform data patterns, represents a string of codes based on a base time, and has a head position, an error detector configured to detect non-coincidence between the input waveform data pattern and each of the predicted waveform data patterns in order to acquire a number of errors indicative of a number of non-coincidences, a current time correction module configured to correct the base time based on the predicted waveform data pattern indicative of a minimum value of the number of errors, and a controller configured to determine the number of predicted waveform data patterns to be generated.