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- W1969206996 abstract "With the increasing number of remote sensing satellites using the GPS radio occultation technique for atmospheric sounding, the estimation of higher order ionospheric effects and their mitigation have become relevant and important. Due to long ionospheric limb paths, GPS signals are strongly affected by ionospheric refraction during radio occultation. Standard dual-frequency GPS measurements may be used to estimate the first order term of the refractive index. However, non-linear terms such as the second and third order ionospheric terms and ray path bending effects are not considered in occultation measurements so far. Analysing selected CHAMP–GPS occultation events different higher order ionospheric terms are estimated and their effects on dual-frequency range estimation and total electron content (TEC) estimation are discussed. We have found that the separation between the GPS L1 and L2 ray paths exceeds the kilometer level during occultation for a vertical TEC level of more than 160 TEC units. Corresponding errors in the GPS dual-frequency range estimation and TEC estimation are found to exceed the meter and 10 TEC units level, respectively." @default.
- W1969206996 created "2016-06-24" @default.
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- W1969206996 creator A5089981971 @default.
- W1969206996 date "2010-07-01" @default.
- W1969206996 modified "2023-10-05" @default.
- W1969206996 title "Higher order ionospheric propagation effects on GPS radio occultation signals" @default.
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- W1969206996 doi "https://doi.org/10.1016/j.asr.2010.02.013" @default.
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