An improvement to ionospheric delay correction for single-frequency GPS users – the APR-I scheme |
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Authors: | Y Yuan J Ou |
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Affiliation: | (1) Institute of Geodesy and Geophysics, Chinese Academy of Sciences, 54 Xudong Road, Wuhan, 430077, China e-mail: ojk1009@public.wh.hb.cn; Fax: +86-27-86783841, CN |
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Abstract: | For the commonly used GPS wide-area augmentation systems (WAAS) with a grid ionospheric model, the efficient modelling of
ionospheric delays in real time, for single-frequency GPS users, is still a crucial issue which needs further research. This
is particularly necessary when differential ionospheric delay corrections cannot be broadcast, when users cannot receive them,
or when there are ionospheric anomalies. Ionospheric delays have a severe effect on navigation performance of single-frequency
receivers. A new scheme is proposed which can efficiently address the above problems. The robust recurrence technique is based
on the efficient combination of single-frequency GPS observations by users and the high-precision differential ionospheric
delay corrections from WAAS. Its effectiveness is verified with examples.
Received: 24 December 1999 / Accepted 21 February 2001 |
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Keywords: | : WAAS – APR-I – Ionospheric Delay – Single-frequency GPS Users |
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