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The relative total electron content （TEC） is obtained through the combination of COSMIC radio occultation ionospheric measurements L1 and L2 phase. The TEC data are then calibrated by non-occultation observation data on the auxiliary side to remove portion of TEC above the LEO orbit altitude. The electron density profile can be retrieved from TEC by Abel integral transformation，with a spherically symmetric assumption of electron density and an approximation of signal straight-line propagation. The computation standard deviation of F2-layer critical frequency f0F2 is about 059 MHz，and the standard deviation of F2-layer peak altitude hmF2 is about 3308 km，as through comparing 4903 COSMIC ionospheric occultation profiles with those from ionosonde stations，of which the longtitude deviations are less than 10°，the latitude deviations are less than 2°.
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Keywords:
- COSMIC /
- GPS/LEO radio occultation /
- ionosonde /
- ionospheric retrieval
[1] ［1］Mannucci A，Wilson B，Yuan D，Ho C，Lindqwister U，Runge T 1998 Radio Sci. 33 565
[2] ［2］Schreiner W S，Sokolovskiy S V，Rocken C，Hunt D C 1999 Radio Sci. 34 949
[3] ［3］Lei J，Syndergaard S，Burns A G，Solomon S C，Wang W，Zeng Z，Roble R G，Wu Q，Kuo Y H，Holt J M，Zhang S R，Hysell D L，Rodrigues F S，Lin C H 2007 J. Geophys. Res. 112 A07308 doi：101029/2006JA012240
[4] ［4］Guo P，Yan H J，Hong Z J，Liu M，Huang C 2004 ChA&A 28 441
[5] ［5］Zeng Z，Hu Z，Zhang X X 2004 Chinese J. Geophys. 47 578 （in Chinese）［曾桢、胡雄、张训械 2004 地球物理学报 47 578］
[6] ［6］Guo P，Yan H J，Hong Z J，Huang C，Liu M 2005 ChA&A 46 96 （in Chinese）［郭鹏、严豪健、洪振杰、黄珹、刘敏 2005 天文学报 46 96］
[7] ［7］Hong Z J，Guo P，Liu M，Huang C 2006 ChA&A 47 100 （in Chinese）［洪振杰、郭鹏、刘敏、黄珹 2006 天文学报 47 100］
[8] ［8］Huang C S，Li J，Kelley M C 1994 Acta Phys. Sin. 43 239 （in Chinese）［黄朝松、李均、Kelley M C 1994 物理学报 43 239］
[9] ［9］Gu Z Y，Ji P Y 2002 Acta Phys. Sin. 51 1022 （in Chinese）［顾震宇、季沛勇 2002 物理学报 51 1022］
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[1] ［1］Mannucci A，Wilson B，Yuan D，Ho C，Lindqwister U，Runge T 1998 Radio Sci. 33 565
[2] ［2］Schreiner W S，Sokolovskiy S V，Rocken C，Hunt D C 1999 Radio Sci. 34 949
[3] ［3］Lei J，Syndergaard S，Burns A G，Solomon S C，Wang W，Zeng Z，Roble R G，Wu Q，Kuo Y H，Holt J M，Zhang S R，Hysell D L，Rodrigues F S，Lin C H 2007 J. Geophys. Res. 112 A07308 doi：101029/2006JA012240
[4] ［4］Guo P，Yan H J，Hong Z J，Liu M，Huang C 2004 ChA&A 28 441
[5] ［5］Zeng Z，Hu Z，Zhang X X 2004 Chinese J. Geophys. 47 578 （in Chinese）［曾桢、胡雄、张训械 2004 地球物理学报 47 578］
[6] ［6］Guo P，Yan H J，Hong Z J，Huang C，Liu M 2005 ChA&A 46 96 （in Chinese）［郭鹏、严豪健、洪振杰、黄珹、刘敏 2005 天文学报 46 96］
[7] ［7］Hong Z J，Guo P，Liu M，Huang C 2006 ChA&A 47 100 （in Chinese）［洪振杰、郭鹏、刘敏、黄珹 2006 天文学报 47 100］
[8] ［8］Huang C S，Li J，Kelley M C 1994 Acta Phys. Sin. 43 239 （in Chinese）［黄朝松、李均、Kelley M C 1994 物理学报 43 239］
[9] ［9］Gu Z Y，Ji P Y 2002 Acta Phys. Sin. 51 1022 （in Chinese）［顾震宇、季沛勇 2002 物理学报 51 1022］
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