Temporal Weather Impacts Upon Exterior Intrusion Detection Systems

摘要

This report is a technical analysis of causes of weather driven temporal changesin the environment that impact the operational efficiency of external intrusion detection systems (IDSs). The report is intended to assist security designers in selecting suitable IDSs for a site and to assist security managers in operating IDSs at the required level of reliability. This is accomplished by identifying temporal variations in weather that are sufficiently general to be identified as patterns, and by identifying how different IDS phenomenologies respond to these patterns. The result is an understanding of how weather conditions influence the ability of types of IDSs to detect reliably activities representative of an intruder while successfully discriminating against weather created conditions within a detection zone. The main body of the report is organized by temporal scale: diurnal, quasiperiodic, and seasonal. Within each temporal scale, weather processes common at that scale are explained. Topics covered include air and soil temperature, soil moisture, precipitation, snow cover, winds, fog, storms, urban and topographic effects, vegetation effects, and solar radiation.