Journal
MARINE GEODESY
Volume 33, Issue -, Pages 272-284Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01490419.2010.487801
Keywords
Ionosphere delay; total electron content; Satellite altimetry
Categories
Funding
- NSF [ATM-0418844]
- NASA [JPL 1356532, 154-5322]
- Chang'E-1 VLBI
- BeiDou GNSS
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In this study, we validated the Jason-2 (J2) dual-frequency ionosphere delay measurements in terms of vertical total electron content (VTEC) in the Geophysical Data Record (GDR) with the coarse resolution JPL Global Ionospheric Maps (GIM), the regional ionospheric maps generated by the Crustal Motion Observation Network of China (CMONOC), and the Jason-1 (J1) interleaved tandem mission (with J2) ionosphere delay measurements. The estimates of the relative biases and their uncertainties (95% confidence, in TEC units) for various comparison cases with different data spans and regions are (1) J2-GIM: -3.07 +/- 0.18 TECu (or 6.75 +/- 0.40 mm in the range delay), (2) J2-CMONOC: -2.87 +/- 0.38 TECu (6.31 +/- 0.84 mm), (3) J1-GIM: -0.19 +/- 0.18 TECu (0.42 +/- 0.40 mm), and (4) J2-J1 via double-differencing, that is, (J2-GIM)-(J1-GIM): -2.88 +/- 0.26 TECu (6.34 +/- 0.57 mm). The scatter (RMS, about the mean differences) between J2 and GIM, CMONOC, or J1 is about 3 similar to 8 TECu (6.6 similar to 17.6 mm). We conclude that the results from global and regional analysis are consistent and that the J2 ionosphere delay is about 6 similar to 10 mm (95% confidence) shorter than the delay computed by GIM, J1, or the regional model.
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