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Accuracy Analysis of Indoor Positioning Using Min-Max Method
(2025-01-01)
Supanakoon, Pichaya
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Vinicchayakul, Wipassorn
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Tabsombat, Sirinya
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Tiengthong, Thanadol
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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
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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
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Vinicchayakul, Wipassorn
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Imsap, Nattapat
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Pakanon, Noppapadon
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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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Study of RC Quadcopter and RC Fixed-Wing RCS Estimation in an Outdoor Environment with L-Band Primary Surveillance Radar
(2022-01-01)
Vinicchayakul, Wipassorn
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Limsumalee, Nattawan
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Tonklang, Intouch
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Srimuang, Pattrawut
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Phungasem, Anupan
This paper presents a study of remote control (RC) quadcopter and RC fixed-wing radar cross section (RCS) estimation with L-Band primary surveillance radar (PSR), working at 1215-1350 MHz. Both RC were tested in an outdoor environment by using vector network analyzer which set up in monostatic radar type. The results illustrate a characteristic of RC quadcopter and RC fixed-wing with the channel impulse response in L-Band primary surveillance radar at each angle in term of the RCS estimation. The RCS value when using the PSR L-Band frequency range changed with the structure. Moreover, overall, the RC quadcopter and RC fixed-wing RCS values are approximately the same, possibly due to the fact that both of them are made of plastic.
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Evaluation of distance error with bluetooth low energy transmission model for indoor positioning
(2021-06-02)
Supanakoon, Pichaya
;
Promwong, Sathaporn
Currently, an indoor positioning is a challenge application for location-based services (LBS) and proximity-based services (PBS). However, the indoor channel has dense multipath fading, causing more distance error than outdoor positioning. In this paper, the distance error analysis model is proposed for indoor positioning. The indoor channel is modeled as the sum of path loss model and multipath fading model. The path loss model is a linear regression model (LRM) based on Friis' transmission formula, used for estimating the distance from received signal strength (RSS). The multipath fading is a Gaussian statistical model with zero mean, used for characterizing the multipath fading effect. The normalized distance error is evaluated and defined. The indoor channel with Bluetooth low energy (BLE) beacons is measured and compared with the proposed model. From the results, the normalized distance error obtained from the proposed model corresponds very well to measurement. This proposed model can be used as a tool for designing an indoor positioning system to obtain the specific distance error.
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Study on accuracy of trilateration method for indoor positioning with BLE beacons
(2020-07-01)
Pakanon, Noppapadon
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Chamchoy, Monchai
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Supanakoon, Pichaya
Nowadays, indoor positioning services of mobile phone with Bluetooth low energy (BLE) beacons are increasingly used. However, due to the indoor environment has dense multipath fading, the positioning system has low accuracy. In this paper, the accuracy study of trilateration method for indoor positioning with BLE beacons is presented. The indoor environment room with 9.0 m width, 10.2 m length and 3 BLE beacons is studied. The received signal strength (RSS) of each BLE beacon is measured by using mobile phone. The distance between each BLE beacon and mobile phone is evaluated using channel model. After that, the trilateration method is used to approximate the position of mobile phone. The accuracies, which are obtained from one, average five and average ten measurements, are studied. The distance errors of all positions and the cumulative distribution function (CDF) of the distance error are calculated and shown. The results show that the average multiple measurements tend to decrease the distance error.
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Accuracy Study of Indoor Positioning with Bluetooth Low Energy Beacons
(2020-03-01)
Phutcharoen, Kanyanee
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Chamchoy, Monchai
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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.
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Evaluation of Indoor Localization with Range-Free Weighted Localization Algorithm
(2018-07-02)
Thongkam, Jutamas
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Supanakoon, Pichaya
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Promwong, Sathaporn
Currently, Ultra-wide band has important in the role of the short-range communication, especially in, an indoor localization. However, there are more factors of the indoor environment caused to reduce the precise localization and also increase the error of distance. The presents a new weighted to evaluate the UWB technology for the indoor localization. The proposed methods are using received signal strength indicator (RSSI) to compute the error of distance based on weighting algorithms. Whereby the weight centroid localizer (WCL) is proposed in this paper. As the results, the cumulative distribution function (CDF) probability indicates the error of distance as properly, and this method can help to increase the precision of range based localization method in an application of indoor environment.
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Study on RSRP of LTE Mobile Phone on Thailand's National Highway
(2018-07-02)
Supanakoon, Pichaya
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Jantana, Trin
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Chamchoy, Monchai
Reference signal received power (RSRP) is an important parameter, which is used to consider the handover between cells of long term evolution (LTE) mobile phone. In this paper, the RSRP of LTE mobile phone on Thailand's national highway is studied. The user equipment (UE), Samsung Galaxy J2 Prime smartphone with service mode, is used to measure the RSRP of all 3 LTE mobile phone operators on Thailand's national highways no. 3 and 361 in Mueang Chonburi District, Chonburi Province. The RSRP along the highways is shown and is studied in terms of probability density function (PDF) and cumulative distribution function (CDF) of Gaussian distribution. The obtained statistical characteristics of RSRP are discussed in conclusion.
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Performance Evaluation of Artificial Megneto-Dielectric Metamaterial with Microstrip Patch Antenna for Wireless System
(2018-07-02)
Pinsakul, Atcharaporn
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Supanakoon, Pichaya
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Promwong, Sathaporn
This paper we presents the performance evaluation of artificial magneto dielectric substrate with microstrip patch antenna for wireless system. From the result, at the resonance frequency 2.45 GHz have the radiation efficiency and the real gain are 88.87% and 6.89 dBi, respectively. The microstrip patch antenna on finite artificial magneto dielectric substrate by used metamaterial structure. The unit cell consist of multi square loop pinned in the dielectric material. The feature of the antenna can be rectify with controlling permeability (boldsymbolmu-eff) and permittivity (boldsymbolvarepsilon-eff).

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