The Statistics of Ionospheria Time Delay for GP8 Ranging on Ll

John A. Klobuchar, Patricia H. Doherty

Abstract:	The L2 frequency on the GPS satellites exists to allow corrections to be made automat- ically by the dual frequency GPS user for the effects of range and range-rate errors induced by the earth's ionosphere. Those GPS users who monitor signals from only the Ll frequency may use an algorithm, transmitted as a part of the GPS message, which allows an approximate 50% rms correction to be made for ionospheric range errors. The ionospheric correction algorithm was constructed using available data from an average solar cycle, yet the present cycle appears to have surpassed all solar activity recorded in the last 300 years. Therefore, it is in order to determine how well the ionospheric algorithm is able to correct for range errors during this period of unprecedented modern ionospheric act- ivity. In this paper the statistics of the actual percentage improvement and residual range error are investigated, as a function of local time, seaswn and solar cycle activity, SW that the potential user of only Ll GPS signals will be better able to understand the distribution of expected residual errors due to the ionosphere.
Published in:	Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990) September 19 - 21, 1990 The Broadmoor Hotel Colorado Spring, CO
Pages:	161 - 168
Cite this article:	Klobuchar, John A., Doherty, Patricia H., "The Statistics of Ionospheria Time Delay for GP8 Ranging on Ll," Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990), Colorado Spring, CO, September 1990, pp. 161-168.
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