A portable detection and warning system (100) that can be deployed in the field uses an array of compact sensor units (200(1 )-200(7)) that can be quickly and easily dispersed along the perimeter (102) or within an area of interest. Also located in the area of interest is a hub (300), which is in wireless communication with each of the sensor units in the field, and a control station (400) located remotely from the area under observation. Each sensor unit (200(1 )-200(7)) acts independently to detect specific phenomenon that might occur in the sector surveyed by it. When an event is detected that meets certain predetermined criterion, the sensor unit is awakened and wirelessly transmits a warning and other information to the hub (300). The hub (300) is able to gather more information related to the alarm and wirelessly transmits this information to the control station (400).
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