Cascading Sensor Network Clock Synchronization Scheme
Meng Zhou, Jie Wu, Xuesong Liu

TL;DR
This paper introduces a hybrid clock synchronization scheme for cascaded sensor networks utilizing GPS and broadcast protocols, achieving high stability comparable to GPS-equipped sensors.
Contribution
It presents a novel hybrid synchronization architecture for cascaded sensors, combining GPS and broadcast sync frames for improved accuracy.
Findings
Center frequency deviation of 0.037 Hz
Clock stability between 0.045 ppm and 0.066 ppm
GPS stability at 0.06 ppm
Abstract
In this paper, we propose a hybrid clock synchronization architecture for a cascaded sensor network based on GPS time service and synchronous frame protocol. The sensor's upper-level unit is called sensor management unit (SMU) which synchronizes the local clock with the GPS and then use the broadcast sync frame to synchronize the clock of the sensor chain. In this paper, we build a link of 20 cascaded sensors to measure the center frequency and clock stability. The results showed that the center frequency deviation was 0.037 Hz and the stability was 0.045 ppm to 0.066 ppm .The stability of GPS is 0.06ppm, the scheme has achieved the effect similar to installing GPS chip on every sensor.
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Taxonomy
TopicsNetwork Time Synchronization Technologies · Context-Aware Activity Recognition Systems · Real-Time Systems Scheduling
