Abstract: This work presents an 8.5–14 GHz dual-path sampling phase detection (SPD)/phase frequency detection (PFD) phase-locked loop (PLL) (DP-SPFDPLL), with extended frequency/phase detection ranges ...
Abstract: The distributed acoustic sensing (DAS) system based on phase-sensitive optical time-domain reflectometry ($\Phi $ -OTDR) uses optical fiber as a medium to detect external vibration ...
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