Pentagon plans blimp to spy from new heights
The giant dirigible would use radar to closely and constantly monitor activity on the ground from 65,000 feet.
Space, Near-Space and Airborne Sensors and Structures
Integrated Sensor is Structure (ISIS)
The goal of the ISIS program is to develop a stratospheric airship based autonomous unmanned sensor with years of persistence in surveillance and tracking of air and ground targets. It will have the capability to track the most advanced cruise missiles at 600 km and dismounted enemy combatants at 300 km.
US$10 million skin for DARPA's remarkable ISIS stratospheric airship
clipped from: www.latimes.com 
