(U) The Fixed Reception Pattern Antenna (FRPA) and Antenna Electronics (AE-4) are used in conjunction to receive signals from the GPS satellites. They are used in aircraft, on board ship, and in manpacks.
(U) Fixed Reception Pattern Antennas (FRPAs) have been developed for aircraft and shipboard use with GPS receivers. These comprise a single element, omni-directional antenna to receive GPS satellite signals from about five to ten degrees above the horizon and up. The FRPA-3 is used for aircraft applications, the FRPA-GP (a FRPA-3 mounted on a ground plane) is used for shipboard applications, and the FRPA-4 is used with the Manpack.
(U) Antenna Electronics (AEs) are used for three basic purposes: to amplify the incoming GPS signal to support longer cable runs to the GPS receiver; to convert the incoming GPS signal to the required Intermediate Frequency (IF); and to process adaptively the signal received from a Controlled Reception Pattern Antenna (CRPA) to reduce the effectiveness of any received jamming signals (AE-1/AE-1A only). Current models are the AE-1/AE-1A, which operates with the CRPA-2, and the AE-4, which is used with the FRPA-3 and FRPA-GP.
(U) The FRPA/AE is used to receive GPS signals and route them to GPS receivers in airborne and ship applications providing highly accurate, all weather navigation and timing information to the aircraft allowing more precise flight patterns, rendezvous, and weapons delivery.
|FRPA||Fixed Reception Pattern Antenna|
|CRPA/AE-1||Controlled Reception Pattern Antenna (CRPA/AE-1)|
|GAS-1 CRPA/AE||GAS-1Controlled Reception Pattern Antenna (CRPA)/AE|
|GPS Block IIA||NAVSTAR Global Positioning System(GPS) Block IIA|
|GPS Block IIF||NAVSTAR Global Positioning System(GPS) Block IIF|
|GPS Block IIR||NAVSTAR Global Positioning System(GPS) Block IIR|
|NAVIGATION||SPACE FORCE ENHANCEMENT: NAVIGATION|
(U) DoD: USD(A&T) and OASD(C3I), Pentagon, Washington, DC
(U) Service Staff: SAF/AQS, Pentagon, Washington, DC
(U) Major Command: HQ AFSPC/DR, Peterson AFB, CO: HQ ACC/DR, Langley AFB, VA
(U) Program Management; SMC/CZ, Los Angeles AFB, CA
(U) Maj Chuck Kastenholz, SMC, Open Phone: (310) 363-6402.
(U) 01 November 1997
(U) Road Map Production Date: 23 June 2001