Ground Equipment Facility J-31
| San Pedro Hill Air Force Station | |
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| Part of 1961-1968:  Air Defense Command1968-1979:  Aerospace Defense Command
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| San Pedro Hill, Rancho Palos Verdes, California (highest elevation of the Palos Verdes Hills) |
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San Pedro Hill AFS in 1988.
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| Coordinates |
33°44′46″N 118°20′10″W / 33.74611°N 118.33611°WCoordinates: 33°44′46″N 118°20′10″W / 33.74611°N 118.33611°W 1.2 miles (1.9 km) southeast of Rolling Hills |
| Type | USAF General Surveillance Radar Station |
| Code | RP-39: 1950 ADC permanent network Z-39: 1963 July 31 NORAD network J-31: 1983 Joint Surveillance System |
| Site information | |
| Controlled by | 1960-79: USAF 670th Radar Squadron 1979-97: Federal Aviation Administration |
| Condition | radar site of Los Angeles ARTCC |
| Site history | |
| In use | 1960-1979 |
 1970s w/ 2 radomes & empty pedestal
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San Pedro AN/FPS-116
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2005 FAA image w/ 2 radomes
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Ground Equipment Facility J-31 (San Pedro Hill Air Force Station during the Cold War) is a Joint Surveillance System radar site of the Western Air Defense Sector (WADS) and the Federal Aviation Administration's air traffic control radar network [1] for the Los Angeles Air Route Traffic Control Center. The facility's Air Route Surveillance Radar Model 1E with an ATCBI-6 beacon interrogator system are operated by the FAA and provide sector data to North American Aerospace Defense Command. The site provided Semi-Automatic Ground Environment data to the 1959-66 Norton AFB Direction Center for the USAF Los Angeles Air Defense Sector. The site also provided Project Nike data to the 1960-74 Fort MacArthur Direction Center ~3 mi (4.8 km) away for the smaller US Army Los Angeles Defense Area—as well as gap-filler radar coverage for the 1963-74 Integrated Fire Control area of Malibu Nike battery LA-78 on San Vicente Mountain.
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Wikipedia