Integration of GPS with the Carrier Aircraft Inertial Navigation System (CAINS)

William A Chittick

Abstract:	The Carrier Aircraft Inertial Navigation System (CAINS} ANJASN-130A ls the Navy standard Inertial Navigation system (INS) used in the F/A-18, AV-88, and EA-68 aircraft. This paper includes a brief description of CAINS and the integration approach chosen (and implemented) between the Rockwell-Collins Global Positioning system R-2332/AR receiver (GPS RCVR 3A) and the Navy INS. Data exchange between the GPS RCVR 3A and INS is accomplished with each acting as a remote terminal on a MIL-STD-1553 bus. The Operational Flight Program of CAINS was modified to use the GPS background navigation output, in the closed loop (feedback) mechanization, as specified in ICD-GPS-063. CAINS uses GPS reference data to perform both in-flight alignment on a moving platform (shipboard or airborne) and hybrid navigation. During hybrid navigation CAINS uses GPS data to continuously align and calibrate the inertial system. Testing has been done in the Carrier environment, in a mobile navigation lab (modified Trailways bus) , and in a McDonnell Douglas test aircraft. Test results are included which show the INS calibration benefits of the closed loop mechanization and the resulting INS performance during GPS outages.
Published in:	Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988) September 19 - 23, 1988 The Broadmoor Hotel Colorado Spring, CO
Pages:	227 - 235
Cite this article:	Chittick, William A, "Integration of GPS with the Carrier Aircraft Inertial Navigation System (CAINS)," Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988), Colorado Spring, CO, September 1988, pp. 227-235.
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