Sirinya Sirikanjanaanan creator Miyazaki, Hiroyuki Chairperson Sarawut Ninsawat Examination Committee Apichon Witayangkurn Examination Committee Royal Thai Government Fellowship Scholarship Donor text series technical report th Pathum Thani, Thailand Asian Institute of Technology 2018 continuing eng 46 leaves : ill. (some col.) Although the Global Positioning System (GPS) has the ability to locate and navigate users to the desired locations, it has become useless, when use in indoor conditions such as in a building, or underground due to the limitation of receiving the GPS signal from satellites. Thus, the current indoor technologies such as Bluetooth can solve this problem. Bluetooth is an effective alternative to indoor positioning technology due to Bluetooth is a low cost and high availability technology but the accuracy of data will depend on the quality of the device used. Therefore, it is necessary for the assessment accuracy of the Bluetooth device in order to receive the best results. This study will show the accuracy of the device, which consists of three main purposes; to investigate the accuracy assessment of the Blumo device in the different distance, to investigate the accuracy assessment of the Blumo device in a different environment, and to investigate in-room positioning and the accuracy assessment using Blumo devices. The data from field survey will be used to calculating to assess the accuracy and the precision. To validate the accuracy of Blumo device will use Received Signal Strength Indicator (RSSI) values for convert to distance by using radio propagation model. The results will present by using statistics including calculation of average and standard deviation. The result of first purpose shown, after 5 meters of outdoor environment the signal will be unstable. For various indoor environment, the accuracy in each case are depends on the different condition and Badminton court gave the most performance for Bluetooth accuracy in term of distance. Location of devices as scattering throughout the experimental area provide the most accurate of the Bluetooth signal. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Remote Sensing and Geographic Information System, School of Engineering and Technology Thesis (M. Sc.) - Asian Institute of Technology, 2018 Indoor positioning systems (Wireless localization) Bluetooth technology Global Positioning System Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B22537 http://203.159.5.9/ait-thesis/detail.php?q=B22537 210303 20260817161424.0