The Pentagon said on Thursday that it intends to spend $400 million to develop a giant dirigible that will float 65,000 feet above the Earth for 10 years,providing unblinking and intricate radar surveillance of the vehicles,planes and even people below.
It is absolutely revolutionary, Werner J A Dahm,chief scientist for the Air Force,said of the proposed unmanned airship describing it as a cross between a satellite and a spy plane.
The 450-foot-long craft would give the US military a better understanding of an adversarys movements,habits and tactics,officials said. And the ability to monitor movements in a wide area the Afghanistan- Pakistan border,for example would improve military intelligence.
It is constant surveillance,uninterrupted, Dahm said. When you only have a short-time view whether it is a few hours or a few days that is not enough to put the picture together.
The project reflects a shift in Pentagon planning and spending priorities under Defence Secretary Robert M Gates,who has urged the military services to improve intelligence and surveillance operations.
If successful,the dirigible the brainchild of the Air Force and the Pentagons research arm could pave the way for a fleet of spy airships,military officials said.
However,it marks the return to a form of flight that has stirred anxiety and doubt since the 1937 Hindenburg disaster. Thirty-six people died when that airship went up in flames in New Jersey.
The military has used less-sophisticated tethered blimps called aerostats to conduct surveillance around military bases in Iraq. But flying at 65,000 feet,the giant airship would be nearly impossible to see,beyond the range of any hand-held missile,and safe from most fighter planes.
And its range would be such that the spy craft could operate at the distant edges of any military theater,probably out of the range of surface-to-air missiles as well.
The Air Forces intelligence,surveillance and reconnaissance abilities have improved dramatically in the last five years with the expansion of the Predator and other drones. Although such craft can linger over an area for a long time,they do not watch constantly. The giant airships military value would come from its radar system. Giant antenna would allow the military to see farther and with more detail than it can now. Being able to observe threats [and understand what is happening is really the game-changing piece here, Dahm said.
The dirigible will be filled with helium and powered by a system that uses solar panels to recharge hydrogen fuel cells. Officials said those technologies,plus a lightweight hull,were critical to making the project work.