US Patent 7893960 Smart sensors for perimeter and border security

A border or perimeter is protected from intruders, such as illegal immigrants, terrorists with WMD or smugglers of drugs. The method comprises a detection and communication processing system capable of a high probability of detection and low probability of false positives. The system includes land-based sensor particles and sensitive airborne or land-based camera processing units. The sensors are sown over key border or perimeter landscape areas and are activated by specific pressure levels characteristic of the weight of transiting intruders whereby the sensors emit characteristic optical signals. Specific emitted indicators detect people, vehicles, or particular animals.