AN/APS-20
The AN/APS-20 was an airborne early warning, anti-submarine, maritime surveillance and weather radar developed in the United States in the 1940s. Entering service in 1945, it served for nearly half a century, finally being retired in 1991. Initially developed at Massachusetts Institute of Technology (MIT) under "Project Cadillac", the radar was developed to be carried by aircraft to extend the sensor range of ships by placing a radar at altitude. Although developed for carrier-borne operation, first being installed in the single-engined General Motors TBM-3W Avenger, it was also used in larger four-engined airframes, the last being a fleet of Avro Shackleton AEW.2 which were converted from maritime patrol aircraft. Similarly, although developed for detecting aircraft, it saw extensive service in anti-submarine and maritime patrol roles and was one of the first radars to be used in researching extreme weather like hurricanes by agencies like the Environmental Science Services Administration (ESSA). As well as the United States, the radar was used by a large number of services in other countries, including the French Navy, Japan Maritime Self-Defense Force (JMSDF), Royal Air Force (RAF) and Royal Canadian Air Force (RCAF). Early versions of the radar could see a low-flying aircraft at and a ship at . This was improved, so that later versions had a range against aerial targets of .
Q161341
airborne early warning
MISC
Q1073579
anti-submarine
Concept
Q6765889
maritime surveillance
Concept
Q863343
weather radar
Concept
Q49108
Massachusetts Institute of Technology
ORG
Q734103
General Motors TBM-3W Avenger
MISC
Q791508
Avro Shackleton AEW.2
MISC
Q6765889
maritime patrol
Concept
Q3055447
Environmental Science Services Administration
ORG
Q217406
French Navy
ORG
Q731647
Japan Maritime Self-Defense Force
ORG
Q165862
Royal Air Force
Concept
Q25456
Royal Canadian Air Force
ORG
Q18061051
AN/APS-20
MISC
1940-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1940
DATE
1945-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1945
DATE
1991-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1991
DATE
-20^^http://www.w3.org/2001/XMLSchema#decimal
-20
NUMBER
-3^^http://www.w3.org/2001/XMLSchema#decimal
-3
NUMBER
+2^^http://www.w3.org/2001/XMLSchema#decimal
2
NUMBER
use
part of