Tiengthong, Thanadol

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KOSEN-KMITL

thanadol.ti@kmitl.ac.th

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A Study of Improved Indoor Localization Accuracy using Looping Min-Max Technique
(2024-01-01)
Tiengthong, Thanadol
;
Mankong, Thanadon
;
Suwansukho, Nattapan
;
Southisombath, Phouthong
;
Chaisang, Aditep
This paper investigates the efficacy of WLAN technology at 5.8 GHz for indoor localization, a widely adopted and versatile approach due to its adaptability and ease of implementation. The choice of 5.8 GHz frequency offers several advantages, including reduced interference and higher data transmission rates, enhancing the precision and reliability of localization systems. Utilizing Received Signal Strength (RSS) for distance calculation is employed due to its computational simplicity and efficiency. The proposed methodology employs a modified Min-Max technique for estimating positions, iterating the Min-Max process until the distance error aligns with a predefined threshold. Comparative evaluation using Cumulative Distribution Function (CDF) demonstrates improved accuracy compared to conventional Min-Max methods. The research findings indicate promising enhancements in accuracy and efficacy for indoor localization using WLAN technology at 5.8 GHz. These advancements hold significant potential for real-time indoor localization applications, paving the way for improved indoor navigation and tracking systems in the future.
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Experimental Study of TETRA Radio for Railway Communication with Leaky Feeder Configuration
(2023-01-01)
Suwansukho, Nattapan
;
Chaisang, Aditep
;
Tiengthong, Thanadol
;
Promwong, Sathaporn
In railway voice communication, the digital radio communication, that are widely used whether along the trackside and in the tunnels especially in urban area. The TETRA standard was selected to be used for fulfill the railway operations requirement. Almost TETRA radio system, the configuration almost carried out with the leaky cable configuration This paper presents the experimental study of TETRA radio system with leaky cable configuration, that being used in the railway communication. The frequency being used are between 385-400 MHz. The result shows the calculated received power compared to the actual received signal with the position of train antenna that closed to the leaky cable, the distance is approx. 3 meters.
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Experimental Evaluation of UWB-HB Transfer Function with LOS and NLOS for WBAN
(2022-01-01)
Promwong, Sathaporn
;
Tiengthong, Thanadol
;
Chaisang, Aditep
Short-range wireless communication with low power and high data rate is a key to the future development of wireless body area network systems. Ultra-wideband technology can achieve the primary wireless communication requirements around the human vicinity. Hence, understanding the human body's effect on wireless communication systems is very important to investigate. This paper will present the evaluation scheme for the ultra-wideband human body channel characteristics in an indoor environment. The experimental is divided into two different scenarios, i.e., line-of-sight and non-line-of-sight, based on the actual wireless body area network applications. The experimental parameters cover the full band of the ultra-wideband regarding the FCC regulation of the ultra-wideband technology. The vector network analyzer and antennas are included in the experiment to measure and record the data. The channel transfer function evaluation results are path loss and delay characteristics. The contributions are useful for further development in the future wireless body area network applications as the basic knowledge of the human body effects.
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Partial Discharge Localization Model in Power Transformer with Fingerprinting Technique
(2023-01-01)
Chaisang, Aditep
;
Tiengthong, Thanadol
;
Maw, Myo Myint
;
Promwong, Sathaporn
Partial discharge localization in power transformers is of utmost importance, requiring an effective evaluation method to identify the location of such events precisely. Antenna placement poses challenges within power transformers, as improper positioning can significantly affect localization precision. This paper introduces an evaluation of the fingerprinting method for ultra-high frequency partial discharge localization. The fingerprinting method, commonly employed in wireless localization systems, is utilized to assess the accuracy of partial discharge localization. The proposed method leverages fingerprinting analysis and received signal strength to evaluate partial discharge events in power transformers. Experimental partial discharge measurements are conducted on a power transformer model provided by Tesla Power Company. The results include the average received signal strength at each measurement position and the distance error of the partial discharge location determined using the fingerprinting method. This research contributes to assessing partial discharge in power transformers, offering valuable insights for enhancing their health and performance evaluation.
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Experimental evaluation scheme of DTTV propagation loss in Thailand
(2019-07-01)
Promwong, Sathaporn
;
Tiengthong, Thanadol
;
Chaisang, Aditep
;
Rangsanseri, Yuttapong
Digital terrestrial television (DTTV) propagation loss should be known characteristics of DTTV propagation channels. In Thailand used DVB-T2 standard for broadcast television channel which shell be study. DTTV propagation loss based in measurement data with system design and analysis of DTTV parameters are importance. In order to predict the result of the broadcast of DVB-T2 in Pathumthani, Thailand, the Hata propagation model is used as the calibration and optimization method for the measurement results. The measurement of the DVB-T2 signal which broadcast from transmitted station are collect as the source of research data. Two broadcast channels were sampling as the broadcasting frequency in this research, i.e., 626 MHz (CH40) and 658 MHz (CH44). The separated distance between transmitted station and received antenna were in range of 2 km. to 7 km. The least square method is use as the optimized propagation model of DVB-T2 signal. The mean error and root mean square error are use as the statistical value for the calibrated model, while relative error is use to indicate the comparison of model component. In the DTTV propagation channel analysis, the root means square error and the optimized method of calibrated model has relative error higher than the calibrated model with mean error. From the results, it shows that the calibrated model of Hata propagation model with mean error is suitable for predict DTTV propagation loss in urban area of Thailand.
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Tiengthong, Thanadol

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