• Journal of Information Technology Applications and Management
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• 제13권3호
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• pp.59-74
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• 2006

According to developing Wireless Communication, not only a location based service at the outside but also a location based service at the inside was more increased socially. This paper proposes the efficient algorithm to locate a transfer object in frequent change of indoor environment using indoor location tracking system we develop ourself. Proposing algorithm in this paper can locate a transfer object using the Fingerprint, one of the Location Tracking techniques which are used in general to minimize error data between Location Tracking System and Fingerprint, using this way that corrects location data as KF apply to result data can improve accuracy of a transfer object. At last we are going to compare and analyze existing typical triangulation with proposed Indoor location tracking system to demonstrate algorithm efficiency for proposed Indoor location tracking system.

• 한국정보시스템학회지:정보시스템연구
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• 제17권1호
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• pp.131-153
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• 2008

So many location based service systems, including automobile navigation system logistic management, taxi fleet management, and so on, are being used everywhere. However, these are all outdoors. This paper provides a stepping stone for commercial indoor location based services by developing an integrated system of our indoor positioning and map viewer modules. For the indoor positioning, we propose WLAN (Wireless Local Area Network) based EKF (Extended Kalman Filter) which estimates user's current location and tracts user's trace in the sequence of time. Our map viewer renders a map recorded in an Autocad DXF file and provides functions of map manipulation such as zoom-in, zoom-out, and move. We integrate our indoor positioning and map viewer modules and discuss the experimental results of the integrated system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.312-314
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• 2005

We have implement indoor positioning system to supply orientation information, We have used ultrasound in indoor positioning system for distance and orientation measurements, then propose a set of methods to calculate orientation from an array of well placed ultrasonic sensors operating in the indoor positioning system, We have design and implement a indoor positioning system using a combination of hardware and software and demonstrate end-to-end functionality of the system, We have implement ZigBee based home automation system using location-aware System.

• 정보통신설비학회논문지
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• 제11권1호
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• pp.1-9
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• 2012

In this paper, we proposed a method of improving the location estimation error existing in RTLS (Real Time Location Service) system for the individual mobility. As ubiquitous age comes, interest for indoor location tracking system is getting more increased. However, existing indoor location tracking system does not correspond actively to frequent changes in indoor environment, and there is a problem that correct location measurement of moving object is difficult due to NLOS (non-line-of-sight) property of indoor environment. Purpose of this paper is to propose an environment accommodation location tracking system that improves the location precision of moving object and grasps location of the object effectively, which is essential an element effectively to provide service and satisfy various users' request.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권2호
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• pp.1162-1179
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• 2017

In this paper, we propose indoor location tracking method using RSSI(Received Signal Strength Indicator) value received from BLE(Bluetooth Low Energy) beacon. Due to the influence of various external environmental factors, it is very difficult to improve the accuracy in indoor location tracking. In order to solve this problem, we propose a novel method of reducing the noise generated in the external environment by using a double Gaussian filter. In addition, the value of the RSSI signal generated in the BLE beacon is different for each device. In this study, we propose a method to allocate additional weights in order to compensate the intensity of signal generated in each device. This makes it possible to improve the accuracy of indoor location tracking using beacons. The experiment results show that the proposed method effectively decrease the RSSI deviation and increase location accuracy. In order to verify the usefulness of this study, we compared the Kalman filter algorithm which is widely used in signal processing. We further performed additional experiments for application area for indoor location service and find that the proposed scheme is useful for BLE-based indoor location service.

• 한국컴퓨터정보학회논문지
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• 제16권8호
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• pp.147-155
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• 2011

위치기반서비스 시스템의 주요 컴포넌트에는 도면출력, 측위, 데이터베이스 관리 등이 포함된다. 도면출력은 일반적으로 구글 지도를 사용하며 측위는 GPS(Global Positioning System)를 사용한다. 그러나 위치기반서비스를 옥내에서 구현하려면 이러한 일반적인 솔루션을 사용할 수가 없다. 즉, 구글 지도로 건물 내부 도면을 출력할 수도 없고, GPS로 건물 내부의 이동객체의 위치를 측정할 수도 없다. 본 연구는 도면출력 기능, 옥내측위 기능 그리고 데이터베이스에 콘텐츠 업로드 및 출력 기능들을 웹서비스로 구현한 사례를 소개하여, 프로그램 개발자가 누구나 쉽게 호출하여 사용할 수 있게 한다. 구현한 웹서비스들의 효용성을 실험적으로 보이기 위하여 이러한 웹서비스들을 이용하여 박물관 관람객의 위치를 고려한 콘텐츠 출력 시스템 프로토타입을 구현한다.

• 한국인터넷방송통신학회논문지
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• 제12권3호
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• pp.155-162
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• 2012

본 논문에서는 유비쿼터스 시대가 도래함에 따라 사회적으로 실내 위치 추적 시스템에 대한 관심이 증가되었다. 하지만 기존 실내 위치 추적 시스템은 실내 환경의 빈번한 변화에 능동적으로 대응하지 못하고, 실내 환경의 NLOS 특성으로 인하여 이동 객체의 정확한 위치 측정이 어려운 문제점이 있다. 본 연구의 목적은 앞으로 유비쿼터스 시대가 도래함에 따라 다양한 사용자의 요구를 만족시키기 위한 서비스를 제공하는데 필수 요소인 실내 이동 객체의 위치를 효과적으로 파악하고, 이동 객체의 위치 정확도를 향상시킨 환경 적응형 위치 추적 시스템을 제안한다.

• Journal of Multimedia Information System
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• 제8권1호
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• pp.11-16
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• 2021

This study developed a design to estimate the location of rescue demander using the sound system at disaster site, in the conditions of indoor positioning cannot be performed properly. It is a location tracing system through smart phone application. It generates sound wave information of rescuer at the rescue site, and it can be used as assistant means for indoor location tracing at the disaster site using sound wave receiving measurement technology.

• 한국통신학회논문지
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• 제34권2B호
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• pp.119-129
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• 2009

유비쿼터스 환경이 도래함에 따라 실외 환경에서의 위치 기반 서비스뿐만 아니라 실내 위치 기반 서비스의 요구가 증가되고 있다. 이에 따라 본 논문에서는 실내 환경에서 객체의 위치를 효과적으로 측위할 수 있는 시스템을 제안한다. 본 논문에서 제안하는 시스템은 실내 환경에서 문제가 되는 비가시선 문제의 해결을 위해 비가시선 식별과 완화하는 기법을 도입했으며, 결과 데이터의 오류 데이터를 최소화하기 위해 잔여-가중치 알고리즘과 칼만 필터를 적용하여 위치 데이터를 보정하는 방법으로 위치 측위시 정확도를 향상시켰다. 마지막으로 제안된 실내 위치 측위 시스템의 성능을 검증하기 위해 기존의 대표적인 위치 척도인 삼각측량 기법과 제안한 위치 측위 시스템의 성능을 비교 및 분석한다.

• 대한임베디드공학회논문지
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• 제16권5호
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• pp.195-200
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• 2021

In this paper, we propose a method for a mobile robot to estimate a specific location of a service provision target using a beacon-tag for the purpose of providing location-based services (LBS) to users in an indoor environment. To estimate the location, the irregular characteristics and error factors of the received signal strength indicator (RSSI) generated from the beacon are analyzed, and the distance conversion function is derived from the RSSI data extracted by applying a Gaussian filter. Then, the distance data converted from the plurality of beacons estimates an indoor location through a triangulation technique. After that, the improvement in the location estimation is analyzed by applying the temporal confidence reasoning technique. The possibility of providing a LBS of a mobile robot was confirmed through a location estimation experiment for a plurality of designated locations in an indoor environment.