A different category of unattended sensors employs scanning sensors, including EO/IR and ground surveillance radars. Such sensors are scanning a larger area, automatically detecting moving targets. The coverage and distances of such sensors depend on the technology used such as, FLIR sensitivity, radar transmitted power and sensitivity, signal processing etc. These sensors are commonly used for perimeter protection, border security and battlefield surveillance. When operated individually, EO/IR systems could suffer from sensitivity degradation under certain conditions, while radar has its own weak spots, particularly in the rejection of false alarms and low velocity targets. Imaging and radar sensors can be integrated with very high probability of detection under all weather conditions. Scanning sensors can be used to cue adjacent remotely operated weapon stations, therefore rapidly closing a sensor-shooter loop engaging time sensitive targets. When a more flexible response is called for, such systems can be integrated with autonomous patrol vehicles, or manned patrols, to establish an effective rapid-response.
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