US 12,432,001 B2
Distributed synchronization system
Chih-Chin Chang, New Taipei (TW); Yu-Min Wang, Taoyuan (TW); Hai-Jian Zhang, New Taipei (TW); and Kai-Yu Yang, New Taipei (TW)
Assigned to Ufi Space co., Ltd., New Taipei (TW)
Filed by Ufi Space co., Ltd., New Taipei (TW)
Filed on Jan. 31, 2023, as Appl. No. 18/162,621.
Prior Publication US 2024/0259151 A1, Aug. 1, 2024
Int. Cl. H04J 3/06 (2006.01); H04L 5/00 (2006.01)
CPC H04J 3/0697 (2013.01) [H04L 5/0048 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A distributed synchronization system, comprising:
a plurality of synchronization devices connected in series with each other, wherein each of the synchronization devices comprises a network input interface and a network output interface; and
a management device, the management device comprising a network input interface and a network output interface and being configured to:
receive a precision time protocol packet, and decode the precision time protocol packet to obtain a reference 1 pulse per second (PPS) signal, a reference frequency signal, and reference time of day information; and
send a reference synchronization signal and a reference control signal to a first synchronization device among the synchronization devices through the network output interface of the management device, wherein the reference control signal requests the first synchronization device to synchronize with the management device based on the reference synchronization signal,
wherein the first synchronization device among the synchronization devices is configured to:
receive the reference synchronization signal and the reference control signal through the network input interface of the first synchronization device;
perform a synchronization operation with the management device based on the reference synchronization signal and the reference control signal, and accordingly generate 1PPS1, f1, and ToD1, wherein 1PPS1 is a 1PPS signal generated by the first synchronization device, f1 is a frequency signal generated by the first synchronization device, and ToD1 is time of day information generated by the first synchronization device; and
send a first synchronization signal and a first control signal to a second synchronization device among the synchronization devices through the network output interface of the first synchronization device, wherein the first synchronization signal comprises 1PPS1, f1, and ToD1, and the first control signal requests the second synchronization device to synchronize with the first synchronization device, wherein f0 and f1 correspond to a preset frequency,
wherein the synchronization operation comprises a phase synchronization operation, and the first synchronization device is configured to:
perform the phase synchronization operation based on 1PPS1 to generate a specific 1PPS signal, and estimate a specific offset between 1PPS0 and the specific 1PPS signal; and
correct the specific 1PPS signal to 1 PPS1 based on the specific offset, wherein the first synchronization device is connected to the management device through a 10 Gigabit Ethernet interface, and the first synchronization device is further configured to report the specific offset to the management device through the 10 Gigabit Ethernet interface.