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  1. Article

    Open Access

    Effects of equatorial plasma bubble-induced ionospheric gradients on GNSS PPP-RTK

    Equatorial plasma bubble (EPB) exerts a severe threat to global navigation satellite system (GNSS) technique. It not only can lead to ionospheric scintillation, but also can create strong plasma gradients in i...

    Long Tang, Fenkai Zhang, Pan Li, Yuanfan Deng, Wu Chen in GPS Solutions (2024)

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  2. No Access

    Article

    Comparative study of ionospheric sporadic E occurrence rates using SNRnstd and S4 derived from GPS radio occultation

    GPS radio occultation (GPS-RO) data, especially the parameters of signal-to-noise ratio normalized standard deviation (SNRnstd) and S4, are widely used to measure the ionospheric sporadic E (Es) layer. However, t...

    Long Tang, Jiaxing Li, Fenkai Zhang, Fang Zou in GPS Solutions (2023)

  3. No Access

    Article

    Ionospheric disturbances of the January 15, 2022, Tonga volcanic eruption observed using the GNSS network in New Zealand

    In this study, the ionospheric response related to the January 15, 2022, Tonga volcanic eruption is investigated using total electron content extracted from the global navigation satellite system network in Ne...

    Long Tang in GPS Solutions (2023)

  4. No Access

    Article

    Large-area tsunami signatures in ionosphere observed by GPS TEC after the 2011 Tohoku earthquake

    The internal gravity waves (IGWs) produced by a tsunami can travel into the ionosphere and trigger traveling ionospheric disturbances (TIDs). In this study, we report ionospheric measurements related to the hu...

    Long Tang, Zhe Li, Boyang Zhou in GPS Solutions (2018)

  5. No Access

    Article

    Analysis of geometry-free residuals in case of traveling ionosphere disturbances and their impact cycle slip detection

    We discuss the impact of a traveling ionospheric disturbance (TID) on cycle slip detection for the geometry-free (GF) combination. Based on the GF combination algorithm, we deduce for the first time the comput...

    Long Tang, Kai Zheng, **ngxing Li in GPS Solutions (2017)

  6. Article

    Open Access

    Observation of ionospheric disturbances induced by the 2011 Tohoku tsunami using far-field GPS data in Hawaii

    In this study, we employ far-field GPS total electron content (TEC) observed in Hawaii to detect the ionospheric disturbances induced by the 2011 Tohoku tsunami. We observed tsunami-driven traveling ionospheri...

    Long Tang, **aohong Zhang, Zhe Li in Earth, Planets and Space (2015)

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  7. No Access

    Chapter and Conference Paper

    A Multi-Step Multi-Order Numerical Difference Method for Traveling Ionospheric Disturbances Detection

    In this paper, we developed a multi-step multi-order numerical difference method to detect the Traveling ionospheric disturbance (TID). This method can eliminate TEC trend effectively and has a wide span of de...

    Long Tang, **aohong Zhang in China Satellite Navigation Conference (CSN… (2014)

  8. No Access

    Chapter and Conference Paper

    Estimation of Compass Satellite Differential Code Biases Using Combined GPS/Compass Observation

    The differential code basis can affect the estimation of the total electric content (TEC) with the global GNSS satellites observations. As it’s the same with GPS satellites it’s very important to estimate the ...

    Long Tang, **aohong Zhang, **ao**g Lin… in China Satellite Navigation Conference (CSN… (2012)