Westinghouse AN/GPA-35 Ground Environment

The Westinghouse AN/GPA-35 Ground Environment (GPA-35 colloq.) was a surface-to-air missile weapons direction system for Cold War launch and steering during CIM-10 Bomarc tests.^[1] The command guidance system manufactured by Westinghouse Electric Corporation^[2] used Bendix AN/FPS-20 Radar data to track the missile, and Lincoln Laboratory Division 6 had an "AN/GPA-35 Study Group" for integrating the AN/GPA-35 into the SAGE System.^[3] Notable launches with GPA-35 guidance included ^[4] (e.g., at the Eastern Range):

• 1956 October—Six launches were used to test the AN/GPA-35 capability to command BOMARC intercept of QB-17 drones.
• 1957 October—A BOMARC test with "live high-explosive warhead" failed when the GPA-35 commanded "faulty mid-course guidance".
• 1958 May 1 -- The "GPA-35 could not control the missile beyond 130 miles."
• 1958 August 7 -- A GPA-35 took control of an airborne BOMARC from the Experimental SAGE Sector, and the missile malfunctioned and crashed into the Atlantic Ocean.
• 1959 March 6 -- A straying BOMARC was self-destructed near the western boundary of the "Eglin Gulf Test Range" after a GPA-35 had transmitted the wrong commands.
• 1959 April 13—The GPA-35 lost control of the missile 100 seconds after launch.
• 1959 April 24—GPA-35 control was used for simultaneous guidance of 2 BOMARCS.

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