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*'''Raytheon AN/FPS-120<ref name=GlobalSecurityClear>{{cite web|url=http://www.globalsecurity.org/space/facility/clear.htm|title=Clear AFS|first=John|last=Pike}}</ref> Solid State Phased Array Radar''' using an older antenna from the 1987<ref>{{cite web|url=http://www.radomes.org/museum/parsehtml.php?html=EldoradoAFSPAVEPAWSTXdedication87.html&type=doc_html|title=Eldorado AFS Dedication - 1987}}</ref> [[Eldorado Air Force Station|PAVE PAWS EWR in Texas]] (groundbreaking April 16, 1998,{{r|GlobalSecurityClear}} for the "Clear Radar Upgrade")<ref>{{Cite web |title=AN/FPS-120 Solid State Phased-Array System [SSPARS]: Clear Radar Upgrade |url=http://www.globalsecurity.org/space/systems/sspars.htm |publisher=GlobalSecurity.org |access-date=2014-03-08}}</ref>
After the Fylingdales BMEWS radars had been replaced by Raytheon/[[Cossor AeroSpace]] and [[Control Data Corporation]] (embedded CDC-Cyber computer) at a cost of US $100M,{{Citation needed|reason=This claim was in the BMEWS article.date=March 2014|date=March 2014}} in February 1995 the "missile warning center at [[Cheyenne Mountain Air Station|Cheyenne Mountain AS]] [was] undergoing a $450 million upgrade program".<ref name=Orban1995>{{cite news|last=Orban|first=SSgt. Brian|date=February 1995|title=The trip wire|newspaper=Guardian|publisher=Air Force Space Command|page=6|quote=North American Aerospace Defense Command and U.S. Space Command command center. ... For more than 30 years, the crews operating the missile warning center inside Cheyenne Mountain have maintained an early warning trip line [for] incoming ballistic missiles}}</ref> The entire SSPARS became operational on January 31, 2001 when the "SSPARS Site"<ref>{{cite web|url=http://www.airforce-technology.com/projects/clear-air-force-station-alaska/|title=Clear Air Force Station, Alaska}}</ref> at Clear AFS (separate from the BMEWS site) had [[Initial Operational Capability]].<ref>{{Cite web |title=Clear AFS, AK |url=http://www.globalsecurity.org/space/facility/clear.htm |publisher=GlobalSecurity.org |access-date=2014-03-05}}</ref> The Clear AN/FPS-120 was subsequently "upgraded to the AN/FPS-123 model" SSPA Radar,<ref>{{cite web|url=http://www.radomes.org/museum/equip/fps-115.html|title=AN/FPS-115, AN/FPS-120, AN/FPS-123, AN/FPS-126}}</ref> and the SSPARS was modified in the '''Early Warning Radar Service Life Extension Program'''<ref name=Chapman>{{Cite book |last=Chapman |first=Bert |title=Space Warfare and Defense: A Historical Encyclopedia and Research Guide |year=2008 |publisher=Bloomsbury Academic |isbn=978-1-59884-006-3 |url=https://books.google.com/books?id=Ae9f-7bV5w4C&q=%22Early+Warning+Radar%22+SSPARS&pg=PA153 |format=Google books |access-date=2014-03-13 |quote=BMEWS was replaced by the Solid State Phased Array Radar System (SSPARS) in 2001.
==Classification of radar systems==
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