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The parameters retrieved from GPS occultation data can be assimilated into numerical weather prediction model. The accuracy of excess phase is affected by the noise from ionosphere and L2 frequency, especially, when L2 signal is encrypted. In order to improve the accuracy of excess phase and remove the noise by the single Difference (SD) method from reference link into occulted link, we use the updated single difference (USD) method to compute atmospheric excess phase. The combined frequency LC data from the reference link are used and smoothed in an interval time window of 2 s. The antenna phase center correction and relativity correction are estimated. The USD method is validated by utilizing COSMIC data. The case analyses of representative rising and setting occultation events indicate that the excess phases from USD and COSMIC are in good agreement. The excess phase of globally distributed 440 occultation events is also computed. The results show that USD method can obviously improve the distribution of mean bias and standard deviation of bias, which demonstrates the reliability of our USD algorithm. The USD method can be applied to the data processing for FY-3 GNOS (GNss Occultation Sounder) occultation mission which uses semi-codeless technique to track L2 signal.
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Keywords:
- GPS /
- occultation /
- excess phase /
- single difference
[1] Ware R, Exner M, Feng D, Gobunov M, Hardy K, Herman B, Kuo Y, Meehan T, Melbourne W, Rocken C, Schreiner W, Sokolovskiy S, Soltheim F, Zou X, Anthes R, Businger S, Trenberth K 1996 Bull. Amer. Meteor. Soc. 77 19
[2] Wickert J, Reigber C, Beyerle G, Konig R, Marquardt C, Schmidt T, Grunwaldt L, Galas R, Meehan T K, Melbourne W G, Hocke K 2001 Geophys. Res. Lett. 28 3263
[3] Luntama J P, Kirchengast G, Borsche M, Foelsche U, Steiner A, Healy S, von Engeln A, O'Clerigh E, Marquardt C 2008 B. Am. Meteorol. Soc. 89 1863
[4] Anthes R A, Bernhardt P A, Chen Y, Cucurull L, Dymond K F, Ector D, Healy S B, Ho S P, Hunt D C, Kuo Y H, Liu H, Manning K, McCormick C, Meehan T K, Randel W J, Rocken C, Schreiner W S, Sokolovskiy S V, Syndergaard S, Thompson D C, Trenberth K E, Wee T K, Yen N L, Zeng Z 2008 B. Am. Meteorol. Soc. 89 313
[5] Guo P, Kuo Y H, Sokolovskiy S V, Lenschow D H 2011 J. Atmos. Sci. doi: 10.1175/2011JAS3612.1
[6] Kuo Y H, Wee T K, Sokolovskiy S, Rocken C, Schreiner W, Hunt D, Anthes R A 2004 J. Meteor. Soc. Japan 82 507
[7] Wickert J, Beyerle G, Hajj G A, Schwieger V, Reigber C 2002 Geophys. Res. Lett. 29 1187
[8] Beyerle G, Schmidt T, Michalak G, Heise S, Wickert J, Reigber C 2005 Geophys. Res. Lett. 32 L13806
[9] Rocken C, Anthes R, Exner M, Hunt D, Sokolovskiy S, Ware R, Gorbunov M, Schreiner W, Feng D, Herman B, Kuo Y H, Zou X 1997 J. Geophys. Res. 102 29849
[10] Sokolovskiy S, Schreiner W, Rocken C, Hunt D 2009 J. Atmos. Oceanic Technol. 26 1398
[11] Schreiner W, Rocken C, Sokolovskiy S, Hunt D 2010 GPS Solutions 14 13
[12] Hu X, Zhang X X, Wu X C 2006 Chinese J. Geophys. 49 22 (in Chinese) [胡雄, 张训械, 吴小成 2006 地球 49 22]
[13] Xu X S, Guo P, Huang S X, Xiang J 2011 Acta Phys. Sin. 60 099202 (in Chinese) [徐贤胜, 郭鹏, 黄思训, 项杰 2011 60 099202]
[14] Wang Y Y, Fu Y, Du X Y, Yan W 2010 Acta Meteorol. Sin. 68 514 (in Chinese) [王也英, 符养, 杜晓勇, 严卫 2010 气象学报 68 514]
[15] Shao H, Zou X L, Hajj G A 2009 J. Appl. Remote Sens. 3 033508
[16] Hajj G A, Kursinski E R, Romans L J, Bertiger W I, Leroy S S 2002 J. Atmos. Sol.-Terr. Phys. 64 451
[17] Dach R, Hugentobler U, Fridez P, Meindl M 2007 Bernese GPS Software Version 5.0, Astronomical Institute, University of Bern
[18] Ashby N 2003 Living Rev. Relativity 6 http: // www. livingreviews. org/lrr-2003-1
[19] Anthes R A 2011 Atmos. Meas. Tech. 4 1077
[20] Schreiner W, Sokolovskiy S, Hunt D, Rocken C, Kuo Y H 2011 Atmos. Meas. Tech. 4 2433
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[1] Ware R, Exner M, Feng D, Gobunov M, Hardy K, Herman B, Kuo Y, Meehan T, Melbourne W, Rocken C, Schreiner W, Sokolovskiy S, Soltheim F, Zou X, Anthes R, Businger S, Trenberth K 1996 Bull. Amer. Meteor. Soc. 77 19
[2] Wickert J, Reigber C, Beyerle G, Konig R, Marquardt C, Schmidt T, Grunwaldt L, Galas R, Meehan T K, Melbourne W G, Hocke K 2001 Geophys. Res. Lett. 28 3263
[3] Luntama J P, Kirchengast G, Borsche M, Foelsche U, Steiner A, Healy S, von Engeln A, O'Clerigh E, Marquardt C 2008 B. Am. Meteorol. Soc. 89 1863
[4] Anthes R A, Bernhardt P A, Chen Y, Cucurull L, Dymond K F, Ector D, Healy S B, Ho S P, Hunt D C, Kuo Y H, Liu H, Manning K, McCormick C, Meehan T K, Randel W J, Rocken C, Schreiner W S, Sokolovskiy S V, Syndergaard S, Thompson D C, Trenberth K E, Wee T K, Yen N L, Zeng Z 2008 B. Am. Meteorol. Soc. 89 313
[5] Guo P, Kuo Y H, Sokolovskiy S V, Lenschow D H 2011 J. Atmos. Sci. doi: 10.1175/2011JAS3612.1
[6] Kuo Y H, Wee T K, Sokolovskiy S, Rocken C, Schreiner W, Hunt D, Anthes R A 2004 J. Meteor. Soc. Japan 82 507
[7] Wickert J, Beyerle G, Hajj G A, Schwieger V, Reigber C 2002 Geophys. Res. Lett. 29 1187
[8] Beyerle G, Schmidt T, Michalak G, Heise S, Wickert J, Reigber C 2005 Geophys. Res. Lett. 32 L13806
[9] Rocken C, Anthes R, Exner M, Hunt D, Sokolovskiy S, Ware R, Gorbunov M, Schreiner W, Feng D, Herman B, Kuo Y H, Zou X 1997 J. Geophys. Res. 102 29849
[10] Sokolovskiy S, Schreiner W, Rocken C, Hunt D 2009 J. Atmos. Oceanic Technol. 26 1398
[11] Schreiner W, Rocken C, Sokolovskiy S, Hunt D 2010 GPS Solutions 14 13
[12] Hu X, Zhang X X, Wu X C 2006 Chinese J. Geophys. 49 22 (in Chinese) [胡雄, 张训械, 吴小成 2006 地球 49 22]
[13] Xu X S, Guo P, Huang S X, Xiang J 2011 Acta Phys. Sin. 60 099202 (in Chinese) [徐贤胜, 郭鹏, 黄思训, 项杰 2011 60 099202]
[14] Wang Y Y, Fu Y, Du X Y, Yan W 2010 Acta Meteorol. Sin. 68 514 (in Chinese) [王也英, 符养, 杜晓勇, 严卫 2010 气象学报 68 514]
[15] Shao H, Zou X L, Hajj G A 2009 J. Appl. Remote Sens. 3 033508
[16] Hajj G A, Kursinski E R, Romans L J, Bertiger W I, Leroy S S 2002 J. Atmos. Sol.-Terr. Phys. 64 451
[17] Dach R, Hugentobler U, Fridez P, Meindl M 2007 Bernese GPS Software Version 5.0, Astronomical Institute, University of Bern
[18] Ashby N 2003 Living Rev. Relativity 6 http: // www. livingreviews. org/lrr-2003-1
[19] Anthes R A 2011 Atmos. Meas. Tech. 4 1077
[20] Schreiner W, Sokolovskiy S, Hunt D, Rocken C, Kuo Y H 2011 Atmos. Meas. Tech. 4 2433
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