Mobile Terminal Time Calibration via GPS Navigation Messages
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Solution Overview
Problem
Mobile terminals cannot precisely adjust their time automatically without accurate reference time or network coverage, as existing methods are prone to errors and rely on network connectivity.
Innovation Solution
A time calibration method using GPS navigation messages and time zone information to determine local time, allowing for automatic time calibration in both active and passive modes, eliminating the need for network coverage and achieving high precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual adjustment based on known reference time is used, then time calibration can be performed without network coverage, but manual errors are introduced and time precision deteriorates
Solution Approach 1:
The mobile terminal automatically performs time calibration by itself using GPS satellite signals as the time reference. The terminal extracts time data from GPS navigation messages and automatically adjusts its system time without requiring manual user input or external assistance, thereby eliminating manual errors while maintaining the capability to operate without network coverage.
Solution Approach 2:
The GPS satellite system serves as an intermediary time reference source between the mobile terminal and accurate time. Instead of relying on manual reference time or network infrastructure, the terminal receives precise time data through GPS signals, which act as a reliable intermediary providing both accuracy and independence from terrestrial networks.
2Extent of automation
If automatic adjustment by network time synchronization is used, then time calibration is automated, but the terminal must be within wireless network coverage and time accuracy is limited to second level
Solution Approach 1:
The GPS satellite system serves as an intermediary time reference source between the mobile terminal and accurate time. Instead of relying on manual reference time or network infrastructure, the terminal receives precise time data through GPS signals, which act as a reliable intermediary providing both accuracy and independence from terrestrial networks.
Solution Approach 2:
The patent replaces the network-based time synchronization mechanism with a GPS-based time calibration mechanism. By substituting the wireless network infrastructure with GPS satellite signals, the system achieves both automation and higher precision (microsecond level compared to second level), eliminating the limitations of network-dependent time calibration.
3Extent of automation
If time calibration by short messages and time servers is used, then automatic time calibration is achieved, but network coverage is required and usage cost increases
Solution Approach 1:
The mobile terminal automatically performs time calibration by itself using GPS satellite signals as the time reference. The terminal extracts time data from GPS navigation messages and automatically adjusts its system time without requiring manual user input or external assistance, thereby eliminating manual errors while maintaining the capability to operate without network coverage.
Solution Approach 2:
The patent extracts the time calibration function from the network-dependent short message and time server system, and relocates it to a GPS-based autonomous system. By taking out the time reference function from the network infrastructure and embedding it in the GPS satellite system, the terminal achieves automatic calibration independent of terrestrial network coverage and associated costs.
4Measurement precision
If GPS-based automatic time calibration is implemented, then all-weather global automatic calibration with high precision is achieved, but the terminal must have GPS signal access
Solution Approach 1:
The mobile terminal integrates multiple time calibration approaches, with GPS-based calibration as the primary method providing high precision when available. The system maintains adaptability by being capable of operating in different modes depending on GPS signal availability, making the time calibration system universally applicable across various environmental conditions while prioritizing the most accurate method when possible.
Data Source
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AI summary
Disclosed are a time calibration method and device. The method includes: a mobile terminal determines the local time where the mobile terminal is located according to the time data in a received GPS navigation message and time zone information about the mobile terminal (S102); and the mobile terminal performing time calibration on itself according to the local time where it is located (S104). The embodiments of the present invention can solve the problem that a mobile terminal cannot precisely adjust the time automatically if there is no accurate reference time or if there is no network coverage.