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Author: search.filters.author.Supanakoon, PichayaSubject: search.filters.subject.UWB standard

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    Study on performance of ultra wideband and narrow band propagation for an indoor positioning
    (2016-07-18)
    Vinicchayakul, Wipassorn
    ;
    Uppahad, Rattiya
    ;
    Supanakoon, Pichaya
    ;
    Promwong, Sathaporn
    This paper studies ultra wideband (UWB) and narrow band (NB) propagation in the frequency range of 3 GHz to 11 GHz. The UWB signal was used to follow the standard of IEEE802.15.4a in order to find the position in line of sight (LOS) and non-line of sight (NLOS) environment. Then, the sinusoidal frequency was tested in the frequency range of 3 GHz to 11 GHz, changing 1 GHz per step in order to analyze and compare with the UWB standard. The experiments were done by using vector network analyzer (VNA). Four conditions were studied in LOS and NLOS environment for indoor positioning. The four condition are the parameters; UWB standard; polarizations; and the frequencies. For the positioning determination, a location pattern technique was used with a minimum root mean square (RMS) error matching algorithm to find the position. Finally, a suitable condition is shown, and it has an accuracy of 91.11% at 1 meter.
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    Localization of index finger using radar cross section measurements for touchless keypad model
    (2015-10-01)
    Vinicchayakul, Wipassorn
    ;
    Supanakoon, Pichaya
    ;
    Promwong, Sathaporn
    This research paper has proposed the use of radar cross section (RCS) measurements as input parameters with a minimum root mean square (RMS) error matching algorithm on a touchless keypad model for localization of human’s index finger. To compare the localization performances, path loss input parameters are also used in the experiments. The touchless keypad model is tested in two different distances between the finger and the keypad under varying conditions. The experiments on the touchless keypad model are carried out in accordance with the IEEE802.15.3a (full band) and IEEE802.15.4a (high and low bands) ultra wideband (UWB) standards and in the horizontal polarizations. This research also examines the effects of Rx angles relative to the finger and of human factor on the RCS parameters by experimenting with seven volunteers.
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    Indoor radar cross section measurements of aluminum hollow rod for ultra wideband applications
    (2015-10-01)
    Vinicchayakul, Wipassorn
    ;
    Supanakoon, Pichaya
    ;
    Promwong, Sathaporn
    Scattering signals, which scatter from furniture items, walls or objects in an indoor environment, affect on the received signals. Furthermore, the scatters have an effect on the radio wave propagation. Therefore, the effects of the scattering signals from the items on the radio wave propagation are investigation and analysis. For this reason, this paper presents an effect between the scattering signals and an aluminum hollow rod in a frequency range of 3.0–11.0 GHz of ultra wideband (UWB) and each angel. Then, the aluminum hollow rod was moved to follow each location in order to test for the UWB applications. An experimental set-up was set by using a vector network analyzer (VNA) for bistatic radar cross section (RCS) measurements in an indoor environment. Then, the scattering signals from the aluminum hollow rod were analyzed in term of the RCS. After that, the RCS was applied to the UWB applications.