Demonstration system for using shipboard-relative GPS

GPS World, April, 2005 by Kathleen Boseley, Jim Waid

Acknowledgements

The authors from Honeywell would like to acknowledge various United States Department of Defense (DoD) agencies for their involvement and technical support of the Honeywell Sea Based Joint Precision Approach and Landing System (JPALS) program. Honeywell's research was accomplished under the joint Army / Navy JPALS/SBJPALS EGI Program, under contract No. F33657-99-C-2040 to the ASC/AAY (EGI SPO Wright Patterson Air Force Base), as part of the JPALS program. Primary government sponsors for this work include the U.S. Army PM-AME, in Huntsville, Alabama, and the U.S. Naval Air Systems Command (PMA 213) at Patuxent River, Maryland.

The objectives of this program include the integration of a single RF SAASM-based 24-channel

Embedded GPS Receiver into Honeywell's H-764 ACE. The application of this new GPS receiver will provide simultaneous L1 and L2 JPALS compliant signal processing necessary to form a relative navigation solution. In addition to the newly integrated 24-channel receiver, Honeywell efforts include developing and embedding the specific Sea Based JPALS processing algorithms required for shipboard landings. This article is based on a technical paper presented at the GNSS ION conference September 20-24, 2004, in Long Beach California, describes Honeywell's results from this effort.

Manufacturers

The 24-channel digital SAASM receiver is being developed by Trimble Navigation (Sunnyvale, California) based on the company's Force 5 GRAM SAASM 12-channel receiver; the SAASM Model 31, Trimble's SAASM multi-chip module which is required for the 24-channel receiver, and the software to handle 24 channels of data instead of the legacy 12 channels. The SAASM Model 31 replaces the SAASM Model 21, which is Trimble's SAASM multi-chip module utilized in their 12-channel variant. The H-764 ACE features three mutually orthogonal QA-2000 accelerometers and three mutually orthogonal GG1320 digital laser gyros from Honeywell and hosts the Honeywell proprietary GCORE4 software on the primary CASP. The CASP serial card developed by Honeywell incorporates the Motorola PowerQUICCII MPC8270.

Further Readings

Altmayer, C., "Cycle Slip Detection and Correction by Means of Integrated Systems," Proceedings of the Institute of Navigation National Technical Meeting 2000, 26-28 January 2000, Anaheim, California.

International Civil Aviation Organization (ICAO), International Standards and Recommended Practices Aeronautical Telecommunications, I Annex 10 Volume I Radio Navigation Aids, July 1996

McCarthy, USN LCDR Chris, and Glenn Colby, Naval Air Systems Command, "Development and Testing of the JPALS Differential GPS Approach and Landing System."

RTCA/DO-245: Minimum Aviation System Performance Standards For The Local Area Augmentation System (LAAS).

Teunissen, P.J.G., and D. Odijk, "Ambiguity Dilution of Precision: Definition, Properties, and Application," Proceedings of the 10th International Technical Meeting of the Satellite Division of the Institute of Navigation, September 1997, pp. 891-899.