Title: DCB Estimation Based on Uncombined PPP
Author(s): Yan Xiang
Published in: Proceedings of the 29th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2016)
September 12 - 16, 2016
Oregon Convention Center
Portland, Oregon
Pages: 672 - 681
Cite this article: Xiang, Yan, "DCB Estimation Based on Uncombined PPP," Proceedings of the 29th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2016), Portland, Oregon, September 2016, pp. 672-681.
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Abstract: Differential Code Bias (DCB) determination is much more relevant when GNSS data processing with code measurements being involved, such as in the ionosphere sensing, positioning and timing. The current approach to estimate DCB is based on smoothed code observations together with ionospheric modeling. The limiting factors of these smoothed code observations for the achievable DCB accuracy are modeling errors and ignored levelling errors. To reduce the levelling error, this paper proposes to calculate the DCB based on uncombined Precise Point Positioning (UPPP). A week’s data from May 12-18, 2014 are processed to validate the method. Results show that satellite DCBs estimated from UPPP are 22 out of 31 satellites more stable than that from the smoothed code. The difference in satellite DCBs between the UPPP and smoothed code are about 0.2ns. The stability of receiver DCBs from proposed method is 16 out of 22 better than that from the conventional method. The interpretation of levelling effects is firstly examined by comparison with both a single receiver and co-located receivers. Keyword: GNSS; Differential Code Bias (DCB); Uncombined PPP; Smoothing/levelling errors