• Title, Summary, Keyword: Irregularity of ionospheric delay

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A Detection Method for Irregularity of Ionospheric delay in Network RTK Environment (네트워크 RTK 환경에서 이온층 지연 변칙현상 검출 기법)

  • Ko, Jaeyoung;Shin, Mi Young;Han, Younghoon;Cho, Deuk Jae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.19 no.11
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    • pp.2562-2568
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    • 2015
  • This paper proposes a detection method for irregularity of ionospheric delay in network RTK (Real Time Kinematic) Environment. The linearity of network RTK correction provided to user can't be assured when a characteristic of temporal-spatial of ionospheric delay is rapidly changed due to geomagnetic storm or solar flare. Therefore, incorrect ambiguity can be resolved and positioning error can be increased. A detection method for irregularity of ionospheric delay is needed to provide reliable correction. In this paper, index to detect irregularity of ionospheric delay is calculated from dispersive corrections and occurrence of irregularity is judged by comparing index and thresholds.

Detection algorithm of ionospheric delay anomaly based on multi-reference stations for ionospheric scintillation

  • Yoo, Yun-Ja;Cho, Deuk-Jae;Park, Sang-Hyun;Shin, Mi-Young
    • Journal of Navigation and Port Research
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    • v.35 no.9
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    • pp.701-706
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    • 2011
  • Radio waves including GPS signals, various TV communications, and radio broadcasting can be disturbed by a strong solar storm, which may occur due to solar flares and produce an ionospheric delay anomaly in the ionosphere according to the change of total electron content. Electron density irregularities can cause deep signal fading, frequently known as ionospheric scintillation, which can result in the positioning error using GPS signal. This paper proposes a detection algorithm for the ionosphere delay anomaly during a solar storm by using multi-reference stations. Different TEC grid which has irregular electron density was applied above one reference station. Then the ionospheric delay in zenith direction applied different TEC will show comparatively large ionospheric zenith delay due to the electron irregularity. The ionospheric slant delay applied an elevation angle at reference station was analyzed to detect the ionospheric delay anomaly that can result in positioning error. A simulation test was implemented and a proposed detection algorithm using data logged by four reference stations was applied to detect the ionospheric delay anomaly compared to a criterion.