Jump to content

Reconnaissance satellite

From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by Lojikbom (talk | contribs) at 22:32, 14 January 2013 (→Origins). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Serum and Vaccine Institute in Al-A'amiriya, Iraq, as imaged by a US reconnaissance satellite in November 2002.
KH-4B Corona satellite
U.S. Lacrosse radar spy satellite under construction
A model of a German SAR-Lupe reconnaissance satellite inside a Cosmos-3M rocket.
Microwave interception (Rhyolite)

A spy satellite (officially referred to as a reconnaissance satellite) is an Earth observation satellite or communications satellite deployed for military or intelligence applications. These are essentially space telescopes that are pointed toward the Earth instead of toward the stars. The first generation type (i.e. Corona [1] [2] and Zenit) took photographs, then ejected canisters of photographic film, which would descend to earth.

Corona capsules were retrieved in mid-air as they floated down on parachutes. Later spacecraft had digital imaging systems and uploaded the images via encrypted radio links.

In the United States, most information available is on programs that existed up to 1972. Some information about programs prior to that time is still classified, and a small trickle of information is available on subsequent missions.

A few up-to-date reconnaissance satellite images have been declassified on occasion, or leaked, as in the case of KH-11 photographs which were sent to Jane's Defence Weekly in 1985.

Origins

On March 16, 1955, the United States Air Force officially ordered the development of an advanced reconnaissance satellite to provide continuous surveillance of 'preselected areas of the earth' in order 'to determine the status of a potential enemy’s war-making capability'.[3] In October 1957, the Soviet Union launched Sputnik 1. It was the first man-made object put in Earth's orbit.

On April 20, 2009, India launched RISAT-2. It was India's first radar reconnaissance satellite, which operates in X-band synthetic aperture radar. RISAT-2 was launched before RISAT-1 to accelerate the pace after 2008 Mumbai attacks, due to delay with the indigenously developed C-band SAR for RISAT-1.[citation needed]

Missions

Examples of reconnaissance satellite missions:

Benefits

During the 1950s a Soviet hoax had led to American fears of a bomber gap. After the United States gained satellite photography its intelligence agencies were able to, for example, in 1968 state with certainty that "No new ICBM complexes have been established in the USSR during the past year."[4]: 198  President Lyndon B. Johnson told a gathering in 1967:

I wouldn't want to be quoted on this ... We've spent $35 or $40 billion on the space program. And if nothing else had come out of it except the knowledge that we gained from space photography, it would be worth ten times what the whole program has cost. Because tonight we know how many missiles the enemy has and, it turned out, our guesses were way off. We were doing things we didn't need to do. We were building things we didn't need to build. We were harboring fears we didn't need to harbor.[4]: 191 

In fiction

Spy satellites are commonly seen in spy fiction and military fiction. Some works of fiction that focus specifically on spy satellites include:

See also

  • Spaceflight portal

    • References

    1. ^ Corona page at NRO
    2. ^ Corona page at NASA
    3. ^ Erickson, Mark. Into the Unknown Together - The DOD, NASA, and Early Spaceflight (PDF). ISBN 1-58566-140-6.
    4. ^ a b Heppenheimer, T. A. (1998). The Space Shuttle Decision. NASA.
    Retrieved from "https://en.wikipedia.org/enwiki/w/index.php?title=Reconnaissance_satellite&oldid=533105885"