The Role of Passive Sensors in Threat Recognition

This article deals with collection methods focusing on passive sensors. New and different sensors along with other sources of intelligence which in fact present new methods that support basis of other traditional methods of intelligence collection and attempts to detect objects and events which themselves are considered as threats.Airborne and space-based threats which monitor military and nonmilitary activities of our country's always try to acquire information about any new movement or activities passively.This article continues to review the role and penetration rate of advanced passive sensors in new environment including acoustic, seismic, scent, light, magnetic, laser and …. so that their significance and capability in identification and detection of targets in passive defense, especially in CCD methods can be explained. Hypotheses and objectives of the research in Delphi method have been examined and analyzed from different sources and practical results of their applications have been presented in the recent wars.