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Author: search.filters.author.Supanakoon, PichayaSubject: search.filters.subject.indoor positioning

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    Accuracy Analysis of Indoor Positioning Using Min-Max Method
    (2025-01-01)
    Supanakoon, Pichaya
    ;
    Vinicchayakul, Wipassorn
    ;
    Tabsombat, Sirinya
    ;
    Tiengthong, Thanadol
    ;
    Promwong, Sathaporn
    In this paper, the accuracy analysis of indoor positioning using min-max method is proposed. The distance error model is applied to estimate the distance between the transmitter and user's position with different path loss exponent and fading amount of indoor channel. The total $\mathbf{1 0 0}$ coordinates of user's positions are estimated using min-max method. The distance error at each position, probability density function (PDF) and cumulative distribution function (CDF) of distance errors are illustrated. The mean of analysis distance error corresponds with the mean of measurement distance error with same path loss exponent and fading amount of indoor channel. The results show that it is possible to use this accuracy analysis to estimate the distance error in an indoor environment.
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    Optimum Weight Parameter of Weight Centroid Method for Indoor Positioning in Environment with Different Path Loss Exponent and Multipath Fading Effect
    (2024-04-01)
    Supanakoon, Pichaya
    ;
    Chamchoy, Monchai
    This paper proposes optimum weight parameter of weight centroid method for indoor positioning in environment with different path loss exponent and multipath fading effect. The indoor environment is defined as square with each side 10 m long. There is a transmitter installed in the center of each side. The distance error model is applied to calculate the distances between the location coordinates of user and the location coordinates of transmitters in environment with different path loss exponent and multipath fading. The total 100 location coordinates of user are estimated by using weight centroid method, varying weight parameter in the range of 1 to 10. The optimum weight parameter is defined as the case where mean of distance error of all positions is the least. The optimum weight parameter for environment with different path loss exponent and multipath fading effect is illustrated. The results show that the optimum weight parameter changes slightly with the path loss exponent and tends to change with the standard deviation of the multipath fading effect divided into 3 periods. The first period tends to increase slowly, the second period tends to increase rapidly, and the third period tends to fluctuate up and down. Moreover, the size of the indoor environment has very little impact on the optimum weight parameter. These results make it possible to select optimum weight parameter for case with path loss exponent and standard deviation of multipath fading effect that match or are close to the channel of indoor environment.
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    Study on Accuracy of Min-Max Method Using Distance Error Model for Indoor Positioning
    (2022-01-01)
    Supanakoon, Pichaya
    ;
    Vinicchayakul, Wipassorn
    ;
    Imsap, Nattapat
    ;
    Pakanon, Noppapadon
    ;
    Chamchoy, Monchai
    Nowadays, the indoor positioning becomes a hot topic. The accuracy is necessary to be study in order to design the positioning system. In this paper, the accuracy of min-max method is studied using distance error model for indoor positioning. The estimated distance is evaluated from distance error model by using the received signal strength (RSS) with indoor channel consists of path loos and multipath fading models. After that, the estimated distance is used with min-max method to estimate the position of receiver and calculate the distance error. The distance error of each position is illustrated. The distance error with specific path loss exponent and standard deviation of multipath fading effect is shown and studied in the terms of probability density function (PDF) and cumulative distribution function (CDF). The results show that the distance error is low at position near transmitter, slightly increased as the path loss exponent decreases and significantly increased as the deviation of multipath fading effect increases.
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    Accuracy Study of Indoor Positioning with Bluetooth Low Energy Beacons
    (2020-03-01)
    Phutcharoen, Kanyanee
    ;
    Chamchoy, Monchai
    ;
    Supanakoon, Pichaya
    Currently, Bluetooth low energy (BLE) beacons are widely used for positioning, especially an indoor environment. However, there is still high error due to dense multipath fading that often occurs in the indoor environment. This paper presents the accuracy study of indoor positioning with BLE beacons. The indoor environment is the room of 91.8 m<sup>2</sup> with 3 BLE beacons. The user equipment (UE), iPhone XS Max, with Beacon Analyzer application is used to measure the received signal strength (RSS) of each BLE beacon. Fingerprinting technique with least root mean square (RMS) error matching is used to estimate the position of UE. The accuracy that obtained from single measurement and average five measurements is studied. The RSS fingerprint of each BLE beacon is shown. The cumulative distribution function (CDF) of distance error is evaluated and illustrated. From the results, the average five measurements can reduce the average distance error about 0.86 m.