Phakphisut, Watid

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Phakphisut, Watid
Alternative Name
Phakphisut, W.
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Email
watid.ph@kmitl.ac.th

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    Item type:Publication,
    Performances of GAGAN Satellite-Based Augmentation System in Thailand Region
    (2020-07-01)
    Sophan, Somkit
    ;
    Phakphisut, Watid
    ;
    Myint, Lin M.M.
    ;
    Supnithi, Pornchai
    The ASEAN IVO project currently supports the research related to GNSS and ionospheric data products for disaster prevention and aviation in low-latitude regions. Satellite-Based Augmentation System (SBAS) is vital to air navigation in many regions around the world. In Thailand, the L1-frequency SBAS corrections can be received from the GPS Aided Geo Augmented Navigation (GAGAN) system which is intended for use over Indian airspace. In this work, we analyze the performances of the GAGAN system in Thailand on quiet and disturbed days in March 2019 by applying the entire corrections received at King Mongkut's Institute of Technology Ladkrabang station. The 95-percent horizontal and vertical accuracies on quiet days are 1.52 and 3.18 meters, respectively. In contrast, on disturbed days they are 1.97 and 3.41 meters, respectively.
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    Improvement of single point positioning accuracy by using GAGAN satellite-based augmentation system in Thailand Region
    (2021-05-19)
    Sophan, Somkit
    ;
    Phakphisut, Watid
    ;
    Myint, Lin M.M.
    ;
    Supnithi, Pornchai
    Although GAGAN satellite-based augmentation system (SBAS) provides ionospheric correction service to India and surrounding areas, the correction values do not cover the entire region of Thailand and even at provided grids, they may not be sufficiently accurate. Hence, this work, we propose a local ionospheric delay estimation method based on the geo-free ionospheric delay estimation. Then the estimated ionospheric delays are applied together with the fast and long-term corrections of GAGAN SBAS to improve the positioning errors. The results show that the estimated ionospheric delays can improve the user positioning errors in terms of horizontal and vertical errors up to 0.5 and 1 meter, respectively.
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    Automatic Dependent Surveillance-Broadcast (ADS-B) data observation and quality assessment in Thailand
    (2021-06-27)
    Ninkaesorn, Waris
    ;
    Poolgate, Sarut
    ;
    Lunzear, Ittipat
    ;
    Sophan, Somkit
    ;
    Phakphisut, Watid
    Automatic Dependent Surveillance-Broadcast (ADS-B) technology provides positions and other important parameters for aircraft during phases of flight. As ADS- B technology is required for all aircraft flying in the US as well as Europe, numerous countries are considering the similar adoption. However, its quality will need to be assessed in each region to ascertain the availability. Since King Mongkut's Institute of Technology Ladkrabang (KMITL) is located near the Suvarnabhumi International Airport, an ideal location for ADSB study, in this work, we develop an ADS-B aircraft tracking system using a software receiver on the Raspberry Pi board to obtain the raw ADS-B data and analyze its qualities. Preliminary results show that the Navigation Uncertainty Category position (NUCp) values are in the level 7 at 81.93% of entire messages.