Test Results for the IN500 Airport Pseudolite

H. Stewart Cobb, Kurt R. Zimmerman, David G. Lawrence, Gregory M. Gutt, Paul Y. Montgomery, Lars G. Leckie

Abstract:	A new GPS pseudolite transmitter designed for the Airport Pseudolite (APL) role has been constructed and tested. As part of the LAAS architecture, the FAA plans to install one or more APL's at major airports to augment the GPS satellite constellation with additional sources of pseudorange information, increasing the availability, continuity, and integrity of GPS navigation for aircraft near those airports. The IN500 APL transmits L1 C/A-code and P-code signals synchronized to the corresponding signals from the GPS satellite constellation, as described in the RTCA SC-159 draft APL specification. Signals from the IN500 APL can be incorporated directly into navigation algorithms in compatible user receivers. The IN500 signals are pulsed to minimize interference with signals from the GPS satellites. The IN500 transmit power is adjustable up to 10 Watts, providing a usable signal to aircraft beginning their approach to the airport. Test data are presented showing the accuracy of absolute and differential pseudorange measurements using IN500 APL signals. Test results also confirm that the IN500 signals present minimal interference to GPS signals, even at close range. These results show that the IN500 meets all known and anticipated Airport Pseudolite (APL) requirements. Most operating parameters of the IN500 are user-programmable to meet new APL requirements as they arise. These user-programmable parameters include carrier frequency, power level, modulation modes, and data formats.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	1517 - 1522
Cite this article:	Cobb, H. Stewart, Zimmerman, Kurt R., Lawrence, David G., Gutt, Gregory M., Montgomery, Paul Y., Leckie, Lars G., "Test Results for the IN500 Airport Pseudolite," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 1517-1522.
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