Search Results 1-20 of 98

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  • Observation of seasonal asymmetry in the range spread F occurrence at different longitudes during low and moderate solar activity

    Afolayan Abimbola O. , Jit Singh Mandeep , Abdullah Mardina , Buhari Suhaila M. , Yokoyama Tatsuhiro , Supnithi Pornchai

    … We believe that the inconsistent equinoctial asymmetry pattern in the RSF occurrence is modulated by the seasonal/longitudinal variation of the zonal drift reversal delay during both solar epochs. … Likewise, the seeding effect and the background ionospheric condition were also considered as major factors influencing the frequency of irregularity generation in these regions. …

    Annales Geophysicae 37(4), 733-745, 2019

    IR 

  • Improved ambiguity ratio test in determination of quiet-time ionospheric delay gradients (Space, Aeronautical and Navigational Electronics) -- (ICSANE 2016)

    BUDTHO Jirapoom , SUPNITHI Pornchai , SAITO Susumu , SAEKOW Apitep

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 116(319), 175-180, 2016-11-24

  • Ameliorating Effects of Ionospheric Delay Corrections of QZS-1 "MICHIBIKI"  [in Japanese]

    永野 達也 , 岡田 真典 , 浦山 文隆 , 小泉 勉 , 大楽 直正 , 佐藤 雅浩 , 新井 秀樹 , 岩本 祥広 , 平原 康孝 , 河手 香織 , 岸本 統久 , 野田 浩幸

    宇宙科学技術連合講演会講演集 60, 6p, 2016-09-06

  • Studies on Spherical Cap Harmonic Analysis for Japanese Regional Ionospheric Delays and its Prediction

    Ohashi Masaharu , Sato Yutaro , Yamada Akihiro , Kubo Yukihiro , Sugimoto Sueo

    … In this paper, we present the regional ionospheric delay models for Global Navigation Satellite System (GNSS). … An ionospheric delay is a dominant error on GNSS positioning. … Then, an ionospheric delay should be corrected for a high positioning accuracy. … In this study, the methods to develop the ionospheric delay models are proposed. …

    Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications 2016(0), 320-325, 2016

    J-STAGE 

  • Partial Ambiguity Resolution Methods Applied by Precise Correction Information for Long Baseline Positioning

    Homan Masato , Kubo Yukihiro , Sugimoto Sueo

    … However, it is also shown that the estimate of the position as well as the integer ambiguity are unreliable due to ionospheric delay, satellite orbit error, etc. … By using PAR and LEX correction, the experimental results show that the dominant error sources such as the ionospheric delay and satellite orbit error are corrected by LEX signal, and the integer ambiguity can be more efficiently resolved. …

    Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications 2016(0), 307-312, 2016

    J-STAGE 

  • Integrated Search for Taiwan Earthquake Precursors (iSTEP)

    Liu Jann-Yenq , Tsai Yi-Ben , Chen Chieh-Hung , Chen Yuh-Ing , Yen Horng-Yuan

    … After the 21 September 1999 M7.6 devastating earthquake, a program entitled the integrated Search for Taiwan Earthquake Precursor (iSTEP-1, 2002/4/1-2006/3/31), which consists of a main project and five sub-projects, was conducted to search credible precursors in seismological variations, geomagnetic and gravity fields, ground surface deformations, and ionospheric electron density anomalies, as well as to evaluate the statistical significance of observed precursors in Taiwan. …

    IEEJ Transactions on Fundamentals and Materials 136(5), 214-220, 2016

    J-STAGE 

  • Spectral Density Analysis of Total Electron Content Perturbations Associated with Earthquakes

    Nakata Hiroyuki , Abe Keigo , Tokunaga Atsuki , Takano Toshiaki , Tsugawa Takuya , Nishioka Michi

    … Since this delay corresponds to the propagation time of acoustic wave from the ground to the ionosphere, it is confirmed that the coseismic variations are due to the acoustic wave generated by the ground/sea surface perturbations. …

    IEEJ Transactions on Fundamentals and Materials 136(5), 272-277, 2016

    J-STAGE 

  • Quality Control of Ionospheric Corrections for L1-SAIF Signal  [in Japanese]

    坂井 丈泰 , 北村 光教 , 伊藤 憲

    宇宙科学技術連合講演会講演集 59, 5p, 2015-10-07

  • Ameliorating Effects of Ionospheric Delay Corrections of QZS-1 "MICHIBIKI"  [in Japanese]

    永野 達也 , 岡田 真典 , 小泉 勉 [他]

    宇宙科学技術連合講演会講演集 59, 4p, 2015-10-07

  • The application of Mobile Mapping System to river embankment measurement  [in Japanese]

    TACHIBANA Kikuo , MANO Koji , SHIMAMURA Hideki , NISHIYAMA Satoshi

    … In the GNSS analysis, longer base line decreased accuracy due to ionospheric and tropospheric delay. …

    Journal of the Japan society of photogrammetry and remote sensing 54(4), 166-177, 2015

    J-STAGE 

  • Study for Practical Utilization of PVD Method  [in Japanese]

    Miyake Toshihide , Tabei Takao , Kato Teruyuki , Terada Yukihiro

    … However, it is necessary to deploy the GPS buoy within approximately 20 kilometers from the coast, since RTK-GPS designed for short-baseline can no longer cancel out tropospheric delay and ionospheric delay between the buoy and the reference station. …

    Journal of the Geodetic Society of Japan 61(2), 57-67, 2015

    J-STAGE 

  • Estimation Methods of VTEC Distribution Applied by Spherical Cap Harmonic Analysis and Kalman Filter

    Ohashi Masaharu , Sato Yutaro , Kubo Yukihiro , Sugimoto Sueo

    … In this paper, we present regional ionospheric delay models for global navigation satellite system (GNSS) and estimation methods of the ionospheric delay. … The ionospheric delay models derived in this paper are based on the spherical cap harmonic analysis (SCHA). …

    Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications 2015(0), 165-170, 2015

    J-STAGE 

  • Research on Ionospheric Scintillation with Beidou Satellite Signal

    ZHAO Qi , DENG Hongwei , ZHAO Hongbo

    … The Earth's ionosphere can hinder radio propagation with two serious problems: group delay and phase advance. … Ionospheric irregularities are significantly troublesome since they make the amplitude and phase of the radio signals fluctuate rapidly, which is known as ionospheric scintillation. … Severe ionospheric scintillation could cause loss of phase lock, which would degrade the positioning accuracy and affect the performance of navigation systems. …

    IEICE Transactions on Communications E98.B(8), 1725-1731, 2015

    J-STAGE 

  • Adaptive Ionospheric Pierce Point Cut-off Radius Control for Korean Satellite Navigation Systems

    JOO Jungmin , HEO Moonbeom , BANG Hyochoong

    … The largest source of positioning error for single-frequency users of the Global Navigation Satellite System (GNSS) is typically the radio delay caused by the ionosphere. … Although several analytic function-based models for correcting ionospheric errors are available, grid-based models are preferred because of their high estimation accuracy and low complexity. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 58(3), 129-135, 2015

    J-STAGE 

  • Ameliorating Effects of Ionospheric Delay Corrections of QZS-1 "MICHIBIKI"  [in Japanese]

    永野 達也 , 新井 秀樹 , 佐藤 雅浩 [他]

    宇宙科学技術連合講演会講演集 58, 5p, 2014-11-12

  • GNSS Landing System in the Low Magnetic Latitude Region (Space, Aeronautical and Navigational Electronics : ICSANE 2014 (International Conference on Space, Aeronautical and Navigational Electronics))

    YOSHIHARA Takayuki

    … Some important integrity risks to GNSS augmentation system have localities, and the most key risk is ionospheric delay variation in GNSS signals. … ENRI has been investigating ionospheric effects on GNSS and developing ionospheric threat especially to the low magnetic latitude region through data collection and sharing activities in cooperation with States and Administrations in the Asia and Pacific region. …

    Technical report of IEICE. SANE 114(264), 51-54, 2014-10-22

  • Refining the Ionospheric Model for GPS Positioning in Regional Area  [in Japanese]

    西本 圭佑 , 大橋 正治 , 久保 幸弘 [他]

    システム制御情報学会論文誌 = Transactions of the Institute of Systems, Control and Information Engineers 27(9), 374-383, 2014-09

  • Klobuchar Like Regional Ionospheric Models -Further Investigation and Results

    Nishimoto K. , Ohashi M. , Kubo Y. , Sugimoto S.

    … Ionosheric delay is one of the major error sources in GNSS (Global Navigation Satellite System) positioning. … For single frequency system, it is very important to effectively correct the ionospheric delay and the so-called Klobuchar model has been widely used due to its well known properties such as computational simplicity. … The Klobuchar model is one of the global ionospheric models, and it can correct about 50% RMS ionospheric errors[1]. …

    Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications 2014(0), 193-198, 2014

    J-STAGE 

  • Analysis of the relationship between the earthquake and the GPS positioning error

    Takahashi Kyohei , Haga Nozomi , Motojima Kuniyuki

    … Because the radio waves used for the global positioning system (GPS) propagate through the ionosphere, it is expected that the anomalies of the ionosphere causes fluctuations of the propagation path and propagation delay, and they result in positioning errors. …

    Journal of Atmospheric Electricity 34(1), 41-53, 2014

    J-STAGE 

  • Refining the Ionospheric Model for GPS Positioning in Regional Area  [in Japanese]

    Nishimoto Keisuke , Ohashi Masaharu , Kubo Yukihiro , Sugimoto Sueo

    … In general GPS positioning, ranging errors due to the ionosphere are corrected by so-called Klobuchar's ionospheric model. … However, it is well known that the model may correct about only 50[%] RMS ionospheric errors. …

    Transactions of the Institute of Systems, Control and Information Engineers 27(9), 374-383, 2014

    J-STAGE 

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