TY - JOUR
T1 - Regional Validation of Jason-2 Dual-Frequency Ionosphere Delays
AU - Tseng, Kuo Hsin
AU - Shum, C. K.
AU - Yi, Yuchan
AU - Dai, Chunli
AU - Lee, Hyongki
AU - Bilitza, Dieter
AU - Komjathy, Attila
AU - Kuo, C. Y.
AU - Ping, Jinsong
AU - Schmidt, Michael
N1 - Funding Information:
This research is supported by grants from NSF’s National Space Weather Program (ATM-0418844), and from NASA’s Ocean Science Topography Mission Program (JPL 1356532, and U. Colorado 154-5322). The Shanghai Astronomical Observatory component of the study is supported by the Chang’E-1 VLBI tracking project, and by the BeiDou GNSS Ionospheric Modeling Project. We thank the Crustal Movement Observation Network of China (CMONOC) for providing the high-level GPS VTEC data products used in this study.
Publisher Copyright:
© 2010, Taylor & Francis Group, LLC.
PY - 2010
Y1 - 2010
N2 - 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∼8 TECu (6.6∼17.6 mm). We conclude that the results from global and regional analysis are consistent and that the J2 ionosphere delay is about 6∼10 mm (95% confidence) shorter than the delay computed by GIM, J1, or the regional model.
AB - 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∼8 TECu (6.6∼17.6 mm). We conclude that the results from global and regional analysis are consistent and that the J2 ionosphere delay is about 6∼10 mm (95% confidence) shorter than the delay computed by GIM, J1, or the regional model.
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U2 - 10.1080/01490419.2010.487801
DO - 10.1080/01490419.2010.487801
M3 - Article
AN - SCOPUS:84868626156
SN - 0149-0419
VL - 33
SP - 272
EP - 284
JO - Marine Geodesy
JF - Marine Geodesy
ER -