(U) The Controlled Reception Pattern Antenna (CRPA-2) has been developed for aircraft use where there is a requirement to provide anti-jamming protection. This is a multi-element antenna, which when used with the AE-1/AE-1A, has the capability to form nulls in the antenna reception pattern. This reduces the effectiveness of jamming signals.
(U) Antenna Electronics (AE)s 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 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. The AE-1A will have the same form-factor and look similar to the AE-1.
(U) An acquisition is ongoing to provide a modernized version of the AE-1/CRPA-2, entitled the GPS Antenna System-1 (GAS-1). A future acquisition will procure the AE/CRPA-F. This antenna system will incorporate state-of-the-art electronics and signal processing techniques to considerably improve the A-J capability of this type of system.
(U) The CRPA/AE is used to receive GPS signals and route them to GPS receivers in airborne applications providing highly accurate, all weather navigation and timing information to the aircraft allowing more precise flight patterns, rendezvous, and weapons delivery. The CRPA provides the capability to receive the GPS signal in a jamming environment.
|FRPA./AE-4||Fixed Reception Pattern Antenna (FRPA)/Antenna Electronics (AE-4)|
|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) 29 June 1998
(U) Road Map Production Date: 23 June 2001