• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.85-87
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• 2011

WPS_WS는 무선 AP의 정보를 통해 현재 이동 객체의 위치를 찾는 시스템이다. 실외 및 실내의 AP 신호 세기 특징을 활용하여 현재 위치를 판단하며 이를 위해 AP 정보를 저장하기 위한 Radio Map구축이 선행되어야 한다. 최초 서비스를 위하여 map을 구성하더라도 실외의 경우 AP신호의 가변성에 의해 구축된 DB의 map 정보를 100% 신뢰할 수 없다. 따라서 신호세기의 변동을 감지하여 능동적으로 map 정보를 변경해 줄 필요가 있다. 본 논문은 이동객체가 현재의 위치를 판단하기 위해 수집한 AP의 정보 중 오류 정보들을 저장하여 분석하고 이를 토대로 구축된 MAP을 실시간으로 변경 및 수정하여 AP의 신호 변경에 능동적으로 대처할 수 있는 Radio Map 최적화 모듈에 대하여 제안한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.11
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• pp.2411-2418
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• 2011

The most typically utilized positioning method in the existing indoor WPS that is a positioning method utilizing distributed wireless network is the finger print. Its positioning is carried out by calculating the difference between the AP information map and WiFi AP signal collected. However, there are problems like low accuracy and high cost when the existing method and the radio map formation are applied to outdoors. In this paper, the characteristics of the existing WPS are surveyed and their problems are examined. In addition, we propose a new WPS using weak signal and a method to construct radio map in order to solve the above problems. And then, the results of experimental test will be analyzed.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.239-241
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• 2011

Recently, studies on the indoor positioning system in application of wireless AP have been actively going on. The indoor wireless positioning system can be classified into several types according to the positioning techniques. Among them, the fingerprint technique is a technique that establishes the radio map by collecting MAC information of AP and RSSI (Received Signal Strength Indication) before executing positioning and then determines the position in comparison with the information of AP collected during the course of positioning. In the traditional fingerprint techniques, they control and manage by installing APs that are utilized for positioning. However, in case of specific indoors, the management can be done by installing a small number of APs but, in case of wide outdoors, it's practically impossible to install and manage equipments for positioning. In order to solve such problem, there is an improved fingerprint technique that utilizes the APs that are already scattered around. This technique will allow positioning without additional cost, but even the improved fingerprint positioning technique may incur dropped accuracy as well due to wide fluctuation of the AP information. In this paper, the traditional fingerprint technique and the improved fingerprint technique are explained in comparison, and we will compares difference in performance with the proposed WPS_WS (Wi-Fi Positioning System_Weak Signal) technique.