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Author: search.filters.author.Kingsakda, Vongkeo

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    Evaluation of ultra wideband indoor localization with trilateration and min-max techniques
    (2016-09-06)
    Monta, Suppachai
    ;
    Promwong, Sathaporn
    ;
    Kingsakda, Vongkeo
    UWB indoor localization has been extensively researched because of its various applications. It can be used in firefighters tracking, logistics and military service. This system requires high accuracy in an indoor environment. In this paper the comparison between trilateration and min-max localization techniques using received signal strength (RSS) and time of arrival (TOA) parameters. This study based on the indoor localization using ultra wideband (UWB) transmission model. The vector network analyzer (VNA) was used to measure at the frequency ranging from 3 GHz to 11 GHz. The biconical antennas were used as both transmitter (Tx) and receiver (Rx) antennas. The accuracy and precision are also studies in the term of distance error. The cumulative distribution function (CDF) of distance error of each case is shown. From the results, the trilateration technique using TOA parameter has the most accuracy.
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    Evaluation of antennas performance with FCC and common spectral mask for UWB localization
    (2015-01-26)
    Kingsakda, Vongkeo
    ;
    Satahack, Phonepaseuth
    ;
    Mingmanee, Sirapop
    ;
    Promwong, Sathaporn
    Antennas which are used to transmit and receive ultra wideband impulse radio (UWB-IR) signals should be able to accomodate its large bandwidth. Moreover, the signals should not be distorted too much when they pass through the antennas. Therefore, the transfer function of antennas should be known the performance. The indoor and the outdoor localization are usually evaluated by using the extension of Friis' transmission formula. However, it is not directly application to UWB transmission systems. This paper are presentation, the characterization of UWB antennas performance that takes into account the transmission signal waveform, its distortion due to the antennas, and the receiver. Since the antennas are significant pulse-shaping filters in UWB, various kinds of antennas are experimentally examined, especially focusing on the UWB template waveform.