A two-stage Kalman filter recovers phase at faded points in phi-OTDR, yielding about 15x denser temperature profiles than conventional faded-point removal.
Distributed optical fiber sensing: Review and perspective
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Fully Distributed Fiber-Optic Sensing Enabled by Kalman Filtering
A two-stage Kalman filter recovers phase at faded points in phi-OTDR, yielding about 15x denser temperature profiles than conventional faded-point removal.