A good reason for an invigorated passive radar project


#1

2006-05-30
By James Renner
Cleveland Free Times
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Last week, a fire ignited at the Akron Airdock that once housed a
fleet of Goodyear blimps. Firemen rushed to the 211-foot-tall
structure and quickly doused the flames. Reporters and photographers
descended on the landmark. Many were surprised to learn the blimps
were no longer being stored there.

Turns out Lockheed Martin – the company that gave us the Trident
intercontinental ballistic missile – was renovating the site for an
upcoming project when the fire started. It’s being turned into a
hangar for a prototype airship. If you’re frightened of this
administration’s habit of spying on American citizens, you may want
to stop reading.

The prototype is called the High Altitude Airship, or HAA. Lockheed
Martin Maritime Systems & Sensors in Akron won the $40 million
contract from the Missile Defense Agency to build HAA in 2003. It is
essentially another blimp. A giant one. Seventeen times the size of
the Goodyear dirigible. It’s designed to float 12 miles above the
earth, far above planes and weather systems. It will be powered by
solar energy, and will stay in a geocentric orbit for up to a year,
undetectable by ground-based radar. You can’t see it from the ground.
But it can see you.

“The possibilities are endless for homeland security,” says Kate
Dunlap, a Lockheed Martin spokesperson. “It could house cameras, and
other surveillance equipment. It would be an eye in the sky.”

According to a summary released by the U.S. Army Space and Missile
Defense Command, the HAA can watch over a circle of countryside 600
miles in diameter. That’s everything between Toledo and New York
City. And they want to build 11. With high-res cameras, that could
mean constant surveillance of every square inch of American soil. “If
you had a fleet of them, this could be used for border surveillance,”
suggests Dunlap.

Launch date: 2009.

Of course, mimicking its defense of warrantless wiretapping and phone-
log
data mining, the government maintains it only wants to protect
its citizens from external threats. But as any geek can tell you,
blimps were ubiquitous in The Watchmen, the seminal '80s graphic
novel in which heroes have been driven underground and Nixon is still
president.

Just because you’re paranoid doesn’t mean they’re not watching you.

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#2

One relatively popular feature of sci-fi is the assumption that if ETs
did
visit Earth’s surface using physical vehicles they would use some sort
of
stealth technology to hide their craft from discovery. Such speculative
fiction is far afield from the hard science and technology of this list
but
my posting the other day about Lockheed’s HAA project and passive radar
(A
good reason for an invigorated passive radar project) got me to thinking
that maybe the search for both might be an interesting project using
GnuRadio.

From what I understand most of the passive radar discussion in the list
have been focused on some type of phased array radar at a single
geographic
location. For locating stealth craft in the atmosphere (e.g., both HAAs
and ETs) it seems that a more distributed approach might be better,
enabling lower cost per sensor location and greater geographic
coverage. What I have in mind is something akin to the way lightning
strikes are monitored in remote or largely uninhabited areas (e.g.,
forests) using VLF. The passive system could use available high-powered
terrestrial transmitters as the illuminators or perhaps better yet the
HF
emanations from the ionosphere or HF/VHF signals created by
meteors.
http://klickitat.ee.washington.edu/mgmeyer/Articles/morabito+etal-2005.pdf

I suggest the name SETV, or Search for Stealth Vehicles - Online. Each
sensor location in SSV would be a connected to the Internet and
synchronized and phased using a GPS-locked clock. Each might have 3
antennas: 2 vertical loops at right angles to provide direction and one
vertical antenna for overall intensity. The PC components of the
sensors
will perform distributed computation to digest their own data, portions
of
the collective input, exchange captured/reduced data (perhaps via Bit
Torrent) and provide a visualization component to make visible SSV
sighting
candidates.

Steve


#3

I forgot to cc this to the list.

NJ