A model of a sensor of an external action on a fibreoptic cable used in extended-perimeter security systems with localisation of the action site is developed. The detection principle is based on phase-sensitive reflectometry with the use of a narrowband pulsed radiation source. The model has a high sensitivity inherent in interference sensors. The maximum detection range and spatial resolution are 35 km and 5 m, respectively.
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Gorshkov et al. (2006) studied this question.