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The effect of solar radio bursts on the GNSS radio occultation signals
Author(s) -
Yue Xinan,
Schreiner William S.,
Kuo YingHwa,
Zhao Biqiang,
Wan Weixing,
Ren Zhipeng,
Liu Libo,
Wei Yong,
Lei Jiuhou,
Solomon Stan,
Rocken Christian
Publication year - 2013
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/jgra.50525
Subject(s) - radio occultation , gnss applications , ionosphere , occultation , environmental science , remote sensing , space weather , daytime , radio frequency , satellite , meteorology , physics , atmospheric sciences , geology , astronomy , telecommunications , computer science
Solar radio burst (SRB) is the radio wave emission after a solar flare, covering a broad frequency range, originated from the Sun's atmosphere. During the SRB occurrence, some specific frequency radio wave could interfere with the Global Navigation Satellite System (GNSS) signals and therefore disturb the received signals. In this study, the low Earth orbit‐ (LEO‐) based high‐resolution GNSS radio occultation (RO) signals from multiple satellites (COSMIC, CHAMP, GRACE, SAC‐C, Metop‐A, and TerraSAR‐X) processed in University Corporation for Atmospheric Research (UCAR) were first used to evaluate the effect of SRB on the RO technique. The radio solar telescope network (RSTN) observed radio flux was used to represent SRB occurrence. An extreme case during 6 December 2006 and statistical analysis during April 2006 to September 2012 were studied. The LEO RO signals show frequent loss of lock (LOL), simultaneous decrease on L1 and L2 signal‐to‐noise ratio (SNR) globally during daytime, small‐scale perturbations of SNR, and decreased successful retrieval percentage (SRP) for both ionospheric and atmospheric occultations during SRB occurrence. A potential harmonic band interference was identified. Either decreased data volume or data quality will influence weather prediction, climate study, and space weather monitoring by using RO data during SRB time. Statistically, the SRP of ionospheric and atmospheric occultation retrieval shows ~4% and ~13% decrease, respectively, while the SNR of L1 and L2 show ~5.7% and ~11.7% decrease, respectively. A threshold value of ~1807 SFU of 1415 MHz frequency, which can result in observable GNSS SNR decrease, was derived based on our statistical analysis.