High-Order Ionospheric Effect on Troposphere Estimation in
Precise Point Positioning
1 Faculty of Geosciences and Enviromental Engineering ,Southwest Jiaotong University,
Abstract Corrected by high-order ionospheric delay, observations are used to estimate satellite orbits and clocks. And the other site’s tropospheric delay is calculated by these orbits and clocks. The results show that it is easy to reach 1cm value in the second-order ionosphere at low latitude areas. This can cause 2-3 mm error to troposphere estimation. But the third-order ionosphere estimation typically cannot exceed 5 mm at low latitude areas. A data test implies that if 1 mm precision of troposphere estimation is desirable, then the site’s second-order ionosphere computation must be corrected in middle and low latitude areas. Since the third-order ionosphere computation effect on troposphere estimation is very small, it can be safely neglected.
Key words ：
high-order ionosphere
precise point positioning
troposphere
Received: 19 April 2014
Published: 02 June 2015
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