Synchronization Correction via Bidirectional Phase Compensation
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Solution Overview
Problem
Existing synchronization mechanisms require multiple signal transmission lines, making wiring inconvenient, and lack bidirectional communication to account for delay errors caused by line length and other factors.
Innovation Solution
A synchronization correction method and system that uses a bidirectional transmission interface, such as a synchronous serial bus, allowing the master device to transmit synchronization signals and receive feedback from the slave device, enabling phase compensation to correct transmission time points of reference 1PPS signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple signal transmission lines are used for synchronization, then synchronization accuracy is improved, but wiring complexity increases
Solution Approach 1:
The patent combines multiple synchronization signals (frequency, phase, and time of date information) into a single integrated synchronization signal frame transmitted over one transmission line. This merging approach maintains synchronization accuracy while eliminating the need for multiple separate transmission lines, thus reducing wiring complexity.
Solution Approach 2:
The single transmission line is designed to carry multiple types of synchronization information simultaneously through a unified protocol structure. The synchronization signal frame includes synchronization header, 1PPS signal, time of date information, and phase compensation information, making the single line multi-functional and replacing what would traditionally require multiple dedicated lines.
2Device complexity
If single signal transmission line is used, then wiring complexity is reduced, but delay error compensation capability is lost
Solution Approach 1:
The patent implements a feedback mechanism where the master device sends phase compensation information in the synchronization signal frame based on the actual receiving time of the reference 1PPS signal from the slave device. This closed-loop feedback enables the system to measure and compensate for transmission delays accurately, even though only a single transmission line is used.
Solution Approach 2:
The system performs preliminary timing measurement by recording the receiving time of the reference 1PPS signal at the master device. Based on this preliminary measurement, the master device calculates the transmission delay and pre-compensates for it by adjusting the phase compensation information in the next synchronization signal frame, ensuring accurate synchronization despite line length variations.
Data Source
AI summary
A synchronization correction method, a master device, and a slave device are provided. The method includes: transmitting a synchronization signal frame to a slave device during a first period of an ith second, where the synchronization signal frame includes a synchronization header, a first pulse per second (1PPS) signal, first time of date information, and first phase compensation information, where the first phase compensation information is configured to request the slave device to correct a transmission time point at which a first reference 1PPS signal is transmitted during a second period of the ith second; receiving the first reference 1PPS signal from the slave device during the second period of the ith second; and determining second phase compensation information transmitted to the slave device according to a receiving time point at which the first reference 1PPS signal is received during a first period of an (i+1)th second.