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SIGINT (signals intelligence) satellites
Reconnaissance (spy) satellites that intercept communications, radar, and other forms of electromagnetic transmissions. ELINT (electronic intelligence) and COMINT (communications intelligence) satellites are sub-categories.
| Chronology of American SIGINT satellites | |||||
|---|---|---|---|---|---|
| 1st generation 1960s |
2nd generation 1970s |
3rd generation 1980s |
4th generation 1990s |
5th generation 2000+ |
|
| GEO-USAF COMINT | Canyon | Chalet/Vortex | Mercury-ELINT | ||
| GEO-CIA ELINT | Rhyolite/Aquacade | Magnum/Orion | Mentor | Intruder | |
| HEO-USAF ELINT | Jumpseat | Trumpet | Prowler | ||
| LEO-USAF ELINT | Ferret | Subsats | Subsats | SB-WASS | |
| LEO-Navy ELINT | GRAB | NOSS | NOSS | SB-WASS |
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