ABSTRACT
Even before the 9/11 attack, the U.S. military and intelligence communities had expended huge amounts of resources to develop new types of sensors and surveillance methods. Advanced sensors range from the development of nanoscale, smart sensors in distributed sensor networks (Smart Dust)1 to national level sensors collecting image and signal data. This trend has enabled an ever-increasing ability to collect data in a vast “vacuum cleaner” approach. The concept is illustrated in Figure 20.1.
