A

David

Darling

SIGINT (signals intelligence) satellites

SIGINT (signals intelligence) satellites are 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