Real-Time Processing of a Phase-Sensitive Distributed Fiber OpticPerimeter Sensor

摘要

This paper reports on recent advances made in real-time intruder detection for an intrusion system utilizing a phase-sensitive optical time-domain reflectometer developed at Texas A&M University. The system uses light pulses from a highly coherent laser to interrogate an optical fiber. The Rayleigh backscattered light is detected, and real-time processing of the received signal is implemented using an FPGA-based system. Signatures from a single human on foot and automobile have been obtained, and are comparable to results obtained with previous signal processing techniques. Individual footsteps are clearly identified for the single human intruder. With the introduction of real-time signal processing, the system can be run continuously, only triggering intrusions when they are detected. These recent advancements allow us to process intruder signatures more effectively. With these advancements, this technology is a prime candidate for low-cost perimeter monitoring of high-value and high-security targets such as nuclear power plants, military bases, and national borders.