Feeds

Spies in the sky: The leaps and bounds from balloons to spook sats

A brief history of aerial surveillance around the globe

SANS - Survey on application security programs

We can thank the CCD for the today's high-resolution satellite imagery, but until the 1970s, everything shot from above had to be recorded on physical media.

No doubt Gaspard-Félix Tournachon struggled aloft with a glass plate camera for his first shots of Paris over 150 years ago, and by the Great War aerial photographers were still grappling with cumbersome devices, albeit a little more user-friendly.

By 1917, the British Williamson P7 camera packed a handy magazine of 24 glass plates of 5in x 4in, but the same manufacturer's WW2 F.24 had embraced roll film, offering up to 250 5in x 4in exposures.

The F.24 system offered interchangeable lenses at focal lengths of 5in, 8in, 14in and 20in, but the image format lacked detail at even the longest of these when photos were taken from high altitude.

The larger F.52 used a 8.5in x 7in film format, with up to 500 exposures available in a single magazine. Optional longer lenses of 36in and 40in focal lengths addressed the resolution from altitude issue.

A montage of aerial surveillance cameras

Post-war surveillance programmes saw the design of increasingly complex roll-film cameras, with many of the US's needs met by the Itek Corporation. The company's HYAC-1 panoramic model, used in the Genetrix balloon missions, led to 70mm film stock models for Corona.

The first Corona launches used a single camera, quickly replaced with a twin-camera set-up dubbed "MURAL" (see above). The cameras' 24in (610mm) focal length lenses - ultimately supplied by 4,900m of film each - could initially resolve objects on the ground of 12m in diameter.

Improvements in the system allowed later Corona satellites to resolve objects just 1.5m in diameter.

By contrast, the folding optics telescope design of the KH-11 satellites' cameras, with a primary mirror of around 230cm and an 800 x 800px CCD, could - based on analysis of leaked photographs - resolve down to 14cm.

While the prospect of photographing a grapefruit from space is a delicious idea, high-altitude fruit surveillance is sadly beyond the pockets of mere mortals.

Next week, we'll have a look at the thriving DIY spy-in-the-sky scene - from UAVs to High Altitude Ballooning (HAB), and give a few pointers as to how those with less than multi-billion dollar budgets can mount their own aerial reconnaissance mission.

In the meantime, we'll leave you with this montage from our Paper Aircraft Released Into Space (PARIS) mission, demonstrating how a balloon, a tank of helium and a $100 camera can provide breathtaking bangs for not many bucks...

Composite image from our PARIS mission

®

Top three mobile application threats

More from The Register

next story
Red-faced LOHAN team 'fesses up in blown SPEARS fuse fiasco
Standing in the corner, big pointy 'D' hats
KILLER SPONGES menacing California coastline
Surfers are safe, crustaceans less so
LOHAN's Punch and Judy show relaunches Thursday
Weather looking good for second pop at test flights
Discovery time for 200m WONDER MATERIALS shaved from 4 MILLENNIA... to 4 years
Alloy, Alloy: Boffins in speed-classification breakthrough
Curiosity finds not-very-Australian-shaped rock on Mars
File under 'messianic pastries' and move on, people
Elon Musk's LEAKY THRUSTER gas stalls Space Station supply run
Helium seeps from Falcon 9 first stage, delays new legs for NASA robonaut
Top Secret US payload launched into space successfully
Clandestine NRO spacecraft sets off on its unknown mission
New FEMTO-MOON sighted BIRTHING from Saturn's RING
Icy 'Peggy' looks to be leaving the outer rings
Melting permafrost switches to nasty, high-gear methane release
Result? 'Way more carbon being released into the atmosphere as methane'
prev story

Whitepapers

Designing a defence for mobile apps
In this whitepaper learn the various considerations for defending mobile applications; from the mobile application architecture itself to the myriad testing technologies needed to properly assess mobile applications risk.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.
Five 3D headsets to be won!
We were so impressed by the Durovis Dive headset we’ve asked the company to give some away to Reg readers.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.