The effects of any budget/program decisions made since the information was collected during 1997-98 are NOT reflected in the National Security Space Road Map (NSSRM).

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(U) 3A Airborne Receiver

Description (U):

(U) Most of the current DoD aircraft are scheduled for integration with GPS JPO-procured 3A and MAGR. These receivers are fully mil-qualified and have undergone extensive developmental and qualification testing.

(U) Although the 3A receiver was developed in 1985, it continues to perform well in the field; the 3A receiver has only received a modest upgrade and is considered to be "older technology." It has five channels to receive and process 5 distinct GPS satellite signals and operates with GPS precision code (P-code) on both GPS L1 and L2 frequencies. The three primary functional shortcomings of the 3A receiver are that:
(U) 1) it is not field reprogrammable (in other words it must be returned to a depot for upgrade),
(U) 2) it does not implement an enhanced anti-spoofing function (recognition and avoidance of deception - intentional or unintentional signal interference)
(U) 3) it is large, heavy and contains many outdated/obsolete components.

(U) The depot at Warner Robins-Air Logistics Command (ALC) provides sustainment support for the 3A receivers, and will continue in that role for the foreseeable future.

User Impact (U):

(U) The GPS 3A receiver is the first GPS DoD receiver widely used in aircraft. It provides highly accurate, all weather navigation and timing information to the aircraft allowing more precise flight patterns, rendezvous, and weapons delivery.

Programmatics (U):

(U) Operational.

• (U) Air Force: Funding Source.
  
  
  (U) PE35164F

Images (U):

(U) None.

Related Initiatives (U):

This Table Is Unclassified.

Name	Title
Embedded GPS Inertial Nav. Sys.	Embedded Global Positioning System (GPS) Inertial (EGI) Navigation System
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
GPS Receiver Applications Module	Global Positioning System (GPS) Receiver Applications Module (GRAM)
Miniaturized Airborne GPS Rec.	Miniaturized Airborne Global Positioning System (GPS) Receiver (MAGR)

Related Requirements (U): None.

Related Categories (U):

This Table Is Unclassified.

Name	Title
Receivers	Receivers

Road Map Placements (U):

This Table Is Unclassified.

Name	Title
NAVIGATION	SPACE FORCE ENHANCEMENT: NAVIGATION

Requirements, Funding and Additional Hotlinks (U):

(U) None.

Lead Office (U):

Air Force.

Point of Contact (U):

(U) Maj Chuck Kastenholz, SMC, Open Phone: (310) 363-6402.

Date Of Information (U):

(U) 17 May 1998

(U) Road Map Production Date: 23 June 2001