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Improving Ambiguity Resolution Rate with an Accurate Ionospheric Differential Correction

  • Mardina Abdullah (a1), Hal J. Strangeways (a2) and David M. A. Walsh (a2)

Ambiguity resolution is essential for precise range determination. As it is difficult to process, a good ionospheric model is essential to get unambiguous results or to reduce time to solve the ambiguities. In this paper, a developed model to determine the differential ionospheric error to sub-centimetre accuracy is described. As a function of elevation angle and TEC, the model is applicable at any location and only requires a single frequency receiver provided the TEC over the reference station is known. It has been evaluated using real GPS measurements at spaced stations in Glasgow (UK) and Stirling (UK), where the results showed good correlation. It was found that the variance ratio and reference variance of the ambiguity resolution rate and the quality of the differential positioning solution are improved. Significant improvements of more than 50% have also been found by correcting the differential ionospheric delay in the measurements for the estimated positions.

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M. Abdullah , H. J. Strangeways and D. M. A. Walsh (2007). Effects of ionospheric horizontal gradients on differential GPS. Acta Geophysica, 55(4), 509523.

L. H. Estey , C. M. Meertens (1999). TEQC: the multi-purpose toolkit for GPS/GLONASS data. GPS Solutions, 3(1), 4249.

J. A. Klobuchar and J. M. Kunches (2001). Eye on the ionosphere: correction methods for GPS ionospheric range delay. GPS Solutions, 5(2), 9192.

G. Seeber (2003). Satellite Geodesy. Walter de Gruyter, Berlin.

H. J. Strangeways (2000). Effect of horizontal gradients on ionospherically reflected or transionospheric paths using a precise homing-in method. Journal of Atmospheric and Terrestrial Physics, 62(15), 13611376.

P. J. G. Teunissen and A. Kleusberg (1998). GPS for Geodesy. Springer, Berlin.

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The Journal of Navigation
  • ISSN: 0373-4633
  • EISSN: 1469-7785
  • URL: /core/journals/journal-of-navigation
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