Cherntanomwong, Panarat

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panarat.ch@kmitl.ac.th

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Indoor localization technique using passive RFID tags
(2009-12-01)
Boontrai, Dokor
;
Jingwangsa, Thidarat
;
Cherntanomwong, Panarat
In this paper, Radio Frequency Identification (RFID) technology is used for localization system. The location of a RFID reader is estimated based on the known locations of RFID tags using the UHF band RFID system. The new location estimation method based on the angulation technique is proposed to determine the reader location in real time. For angulation technique, the RFID reader is held on the camera tripod and it is considered as the target to be localized. The passive tags are attached at the known location and considered as the references. In this case, the RFID tags are put in the horizontal straight line on different sides on the walls (around the corner). The required parameter is the angle between the tag and the reader. In this paper, a compass is employed to measure the angle between the tag and the reader. Therefore, at least two angles are needed and further used to calculate the true location of the reader by using two formulated linear equations. This technique is verified using the experiment data. Two experiments are conducted with two different distances between tags and reader, i.e. 100 cm and 150 cm. The experiment results of location estimation show that the average location estimation error is around 16 cm for the 100 cm distance and around 20 cm for the 150 cm distance. This implies that the proposed method is satisfied to use for indoor applications. ©2009 IEEE.
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Signal subspace interpolation from discrete measurement samples In constructing a database for location fingerprint technique
(2009-01-01)
Cherntanomwong, Panarat
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Takada, Jun Ichi
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Tsuji, Hiroyuki
In this paper, a method of the signal subspace interpolation to constructing a continuous fingerprint database for radio localization is proposed. When using the fingerprint technique, enhancing the accuracy of location estimation requires very fine spatial resolution of the database, which entails much time in collecting the data to build up the database. Interpolated signal subspace is presented to achieve a fine spatial resolution of the fingerprint database. The angle of arrival (AOA) and the measured signal subspace at known locations are needed to obtain the interpolated signal subspaces. The effectiveness of this method is verified by an outdoor experiment and the estimated location using this method was compared with those using the geometrically calculated fingerprint and the measured signal subspace fingerprint techniques. Copyright © 2009 The Institute of Electronics, Information and Communication Engineers.
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Empirical evaluation of RFID-based indoor localization with human body effect
(2009-12-01)
Pathanawongthum, Nichapat
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Cherntanomwong, Panarat
In this paper, the human body effect on indoor localization is evaluated based on experiments. Radio Frequency Identification (RFID) technology is used for this localization system. The location of a RFID reader is estimated based on the known locations of the RFID tags attached to the ceiling with 60 cm separation. Two cases of experiments are considered. For the first case, the RFID reader is attached to the camera tripod and the second case, it is attached to human body. Then, two simple location estimation methods are employed. To evaluate the effect of human body on the localization, the results of location estimation with and without human are compared. The experimental results illustrate that the human body affects the location estimation in some certain. However, the error of location estimation is still less than 50 cm which is applicable for some indoor applications. ©2009 IEEE.
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A novel approach of RFID based indoor localization using fingerprinting techniques
(2009-12-01)
Soonjun, Suwatchai
;
Boontri, Dokor
;
Cherntanomwong, Panarat
In this paper, a novel approach for an indoor localization using a fingerprint technique is proposed. The UHF band Radio Frequency Identification (RFID) system is utilized. The passive RFID tags are employed as references attached to the ceiling at known locations and the RFID reader carrying on the vehicle of interest is the target to be localized. The basic principle of the fingerprint technique is to find the location of the target by comparing its signal (or information) pattern with a previously recoded database of known signal (or information)-location data. Therefore, there are two main steps to estimate the target location: (i) construction of database containing the signals (or information) and their corresponding locations, and (ii) estimation of the target location. In this paper, firstly, the detected tags found by the reader at each location of interest are collected and from now on the detected tags are called a fingerprint. Secondly, the location of the reader can be estimated using two proposed methods using the intersection between the detected tags and fingerprints. These two methods are compared to a simple method called the center of gravity (C.G.). The effectiveness of this method is verified by an indoor experiment. The result of location estimation error is less than 60 cm. ©2009 IEEE.
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Improvement of RFID based location fingerprint technique for indoor environment
(2009-12-01)
Soonjun, Suwatchai
;
Promwong, Sathaporn
;
Cherntanomwong, Panarat
In this paper, the improvement of an indoor localization using a fingerprint technique is proposed. The Radio Frequency Identification (RFID) system is utilized. In general, the RFID localization can be categorized into two main types: one is the reader localization in which the reader locations will be estimated and one is the tag localization in which the tag locations will be estimation. The selection of these two types depends on the applications. In this paper, the reader localization is considered because of the lower system cost. For the reader localization, although a large number of tags is used, the tag cost is much cheaper than the reader cost. The passive tags are employed as references attached to the ceiling at known locations and the reader carrying on the vehicle of interest is the target to be localized. The basic principle of the fingerprint technique is to find the location of the target by comparing its signal (or information) pattern with a previously recoded database of known signal (or information)-location data. Therefore, there are two main steps to estimate the target location: (i) construction of database containing the signals (or information) and their corresponding locations, and (ii) estimation of the target location. In this paper, firstly, the detected tags found by the reader at each location of interest are collected and from now on the detected tags are called a fingerprint. Secondly, the location of the reader can be estimated using three proposed methods using the intersection between the detected tags and fingerprints. The effectiveness of each method is verified by experiment data. The best result of location estimation error among three proposed methods is less than 35 cm. ©2009 IEEE.
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Evaluation of two path model in UWB propagation channel with laptop computers for PAN
(2008-12-01)
Manositthichai, Narongsak
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Promwong, Sathaporn
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Cherntanomwong, Panarat
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Malison, Phissanu
In this paper, the evaluation of two path model in ultra wideband (UWB) propagation channel with laptop computers for personal area network (PAN) is proposed. The UWB pulse with the specific center frequency and bandwidth is used for the transmitted signal. Complex form Friis' transmission formula is applied for the UWB propagation channel, then the received signal is evaluated. The UWB path loss is defined as the ratio between the maximum amplitude of the transmitted and received signal waveforms. For the data processing, the path loss of two path model is considered for the 0.10 and 0.20 m antenna heights. The double linear regression for the path loss is modeled by using the minimum mean square error (MMSE) and first Fresnel zone break-point curve fits. The characteristics of the path loss function of the antenna height is evaluated and discussed in the paper. ©2008 IEICE.

Cherntanomwong, Panarat

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