An Interfrequency Bias Calibrator for TurboRogue GPS Receivers

Courtney Duncan, Donovan Spitzmesser, Thomas Meehan, Garth Franklin and Brian Wilson

Abstract:	This paper describes the design and performance of a GPS delay calibrator developed at the Jet Propulsion Laboratory for use with TurboRogue receivers in JPL’s global GPS network. The calibrator generates a ranging code at the P-code rate which is modulated onto both L1 and L2 and is injected into the signal path in order to measure the L2 to L1 interfrequency bias in the receiver. TurboRogue receivers with proper software can track the calibration signal continuously during operation. These calibrations eliminate the need to estimate the receiver bias, and increase the absolute accuracy with which ionospheric measurements may be made. In addition, calibrated ground-receiver data can be used to unambiguously estimate the L1-L2 bias that is present at the GPS satellites. This paper discusses the performance of the delay calibrator in laboratory tests.
Published in:	Proceedings of the 1998 National Technical Meeting of The Institute of Navigation January 21 - 23, 1998 Westin Long Beach Hotel Long Beach, CA
Pages:	659 - 666
Cite this article:	Duncan, Courtney, Spitzmesser, Donovan, Meehan, Thomas, Franklin, Garth, Wilson, Brian, "An Interfrequency Bias Calibrator for TurboRogue GPS Receivers," Proceedings of the 1998 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 1998, pp. 659-666.
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