• Title/Summary/Keyword: Indoor location tracking system

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Radar-based Security System: Implementation for Cluttered Environment

  • Lee, Tae-Yun;Skvortsov, Vladimir;Ka, Min-Ho
    • Journal of IKEEE
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    • v.19 no.2
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    • pp.160-167
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    • 2015
  • We present an experimental implementation of the inexpensive microwave security sensor that can detect both static and slowly moving objects in cluttered environment. The prototype consists of a frequency-modulated continuous wave radar sensor, control board or computer and software. The prototype was tested in a cluttered indoor environment. In case of intrusion or change of environment the sensor will give an alarm, determine the location of new object, change in its location and can detect a slowly moving target. To make a low-cost unit we use commercially available automotive radar and own signal processing techniques for object detection and tracking. The intruder detection is based on a comparison between current 'image' in memory and 'no-intrusion' reference image. The main challenge is to develop a reliable technique for detection of a relatively low-magnitude object signals hidden in multipath clutter echo signals. Various experimental measurements and computations have shown the feasibility and performance of the system.

Wi-Fi Fingerprint Location Estimation System Based on Reliability (신뢰도 기반 Wi-Fi 핑거프린트 위치 추정 시스템)

  • Son, Sanghyun;Park, Youngjoon;Kim, Beomjun;Baek, Yunju
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38C no.6
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    • pp.531-539
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    • 2013
  • Fingerprinting technique uses the radio signal strength measured reference locations is typically used, although there are many Wi-Fi based location tracking techniques. However, it needs numerous reference locations for precision and accuracy. This paper the analyzes problems of previous techniques and proposes a fingerprinting system using reliability based on a signal strength map. The system collects the signal strength data from a number of reference locations designated by the developer. And then it generates path-loss models to one of the access points for each reference location. These models calculate the predicted signal strength and reliability for a lattice. To evaluate proposed method and system performance, We perform experiments in a $20m{\times}22m$ real indoor environment installed access points. According to the result, the proposed system reduced distance error than RADAR. Comparing the existing system, it reduced about 1.74m.

Infrared-based User Location Tracking System for Indoor Environments (적외선 기반 실내 사용자 위치 추적 시스템)

  • Jung, Seok-Min;Jung, Woo-Jin;Woo, Woon-Tack
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.42 no.5
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    • pp.9-20
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    • 2005
  • In this paper, we propose ubiTrack, a system which tracks users' location in indoor environments by employing infrared-based proximity method. Most of recently developed systems have focussed on performance and accuracy. For this reason, they adopted the idea of centralized management, which gathers all information in a main system to monitor users' location. However, these systems raise privacy concerns in ubiquitous computing environments where tons of sensors are seamlessly embedded into environments. In addition, centralized systems also need high computational power to support multiple users. The proposed ubiTrack is designed as a passive mobile architecture to relax privacy problems. Moreover, ubiTrack utilizes appropriate area as a unit to efficiently track users. To achieve this, ubiTrack overlaps each sensing area by utilizing the TDM (Time-Division Multiplexing) method. Additionally, ubiTrack exploits various filtering methods at each receiver and utilization module. The filtering methods minimize unexpected noise effect caused by external shock or intensity weakness of ID signal at the boundary of sensing area. ubiTrack can be applied not only to location-based applications but also to context-aware applications because of its associated module. This module is a part of middleware to support communication between heterogeneous applications or sensors in ubiquitous computing environments.

A Moving Path Control of an Automatic Guided Vehicle Using Relative Distance Fingerprinting (상대거리 지문 정보를 이용한 무인이송차량의 주행 경로 제어)

  • Hong, Youn Sik;Kim, Da Jung;Hong, Sang Hyun
    • KIPS Transactions on Computer and Communication Systems
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    • v.2 no.10
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    • pp.427-436
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    • 2013
  • In this paper, a method of moving path control of an automatic guided vehicle in an indoor environment through recognition of marker images using vision sensors is presented. The existing AGV moving control system using infrared-ray sensors and landmarks have faced at two critical problems. Since there are many windows in a crematorium, they are going to let in too much sunlight in the main hall which is the moving area of AGVs. Sunlight affects the correct recognition of landmarks due to refraction and/or reflection of sunlight. The second one is that a crematorium has a narrow indoor environment compared to typical industrial fields. Particularly when an AVG changes its direction to enter the designated furnace the information provided by guided sensors cannot be utilized to estimate its location because the rotating space is too narrow to get them. To resolve the occurrences of such circumstances that cannot access sensing data in a WSN environment, a relative distance from marker to an AGV will be used as fingerprinting used for location estimation. Compared to the existing fingerprinting method which uses RSS, our proposed method may result in a higher reliable estimation of location. Our experimental results show that the proposed method proves the correctness and applicability. In addition, our proposed approach will be applied to the AGV system in the crematorium so that it can transport a dead body safely from the loading place to its rightful destination.

Position Recognition and User Identification System Using Signal Strength Map in Home Healthcare Based on Wireless Sensor Networks (WSNs) (무선 센서네트워크 기반 신호강도 맵을 이용한 재택형 위치인식 및 사용자 식별 시스템)

  • Yang, Yong-Ju;Lee, Jung-Hoon;Song, Sang-Ha;Yoon, Young-Ro
    • Journal of Biomedical Engineering Research
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    • v.28 no.4
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    • pp.494-502
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    • 2007
  • Ubiquitous location based services (u-LBS) will be interested to an important services. They can easily recognize object position at anytime, anywhere. At present, many researchers are making a study of the position recognition and tracking. This paper consists of postion recognition and user identification system. The position recognition is based on location under services (LBS) using a signal strength map, a database is previously made use of empirical measured received signal strength indicator (RSSI). The user identification system automatically controls instruments which is located in home. Moreover users are able to measures body signal freely. We implemented the multi-hop routing method using the Star-Mesh networks. Also, we use the sensor devices which are satisfied with the IEEE 802.15.4 specification. The used devices are the Nano-24 modules in Octacomm Co. Ltd. A RSSI is very important factor in position recognition analysis. It makes use of the way that decides position recognition and user identification in narrow indoor space. In experiments, we can analyze properties of the RSSI, draw the parameter about position recognition. The experimental result is that RSSI value is attenuated according to increasing distances. It also derives property of the radio frequency (RF) signal. Moreover, we express the monitoring program using the Microsoft C#. Finally, the proposed methods are expected to protect a sudden death and an accident in home.

A Study on Indoor Position-Tracking System Using RSSI Characteristics of Beacon (비콘의 RSSI 특성을 이용한 실내 위치 추적 시스템에 관한 연구)

  • Kim, Ji-seong;Kim, Yong-kab;Hoang, Geun-chang
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.17 no.5
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    • pp.85-90
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    • 2017
  • Indoor location-based services have been developed based on the Internet of Things technologies which measure and analyze users who are moving in their daily lives. These various indoor positioning technologies require separate hardware and have several disadvantages, such as a communication protocol which becomes complicated. Based on the fact that a reduction in signal strength occurs according to the distance due to the physical characteristics of the transmitted signal, RSSI technology that uses the received signal strength of the wireless signal used in this paper measures the strength of the transmitted signal and the intensity of the attenuated received signal and then calculates the distance between a transmitter and a receiver, which requires no separate costs and makes to implement simple measurements. It was applied calculating the value for the average RSSI and the RSSI filtering feedback. Filtering is used to reduce the error of the RSSI values that are measured at long distance.It was confirmed that the RSSI values through the average filtering and the RSSI values measured by setting the coefficient value of the feedback filtering to 0.5 were ranged from -61 dBm to - 52.5 dBm, which shows irregular and high values decrease slightly as much as about -2 dBm to -6 dBm as compared to general measurements.

Indoor_Location Tracking System Based on ON/OFF Switches and Sensors (ON/OFF 스위치 및 센서 기반의 실내 위치 추적 시스템)

  • Lee, Chung-Sub;Park, Hi-Soon;Kim, Nam-Gyun;Joo, Su-Chong
    • Annual Conference of KIPS
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    • 2005.11a
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    • pp.1141-1144
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    • 2005
  • 본 논문은 실내에서 홈 거주자의 위치를 인식하기 위해 근접성을 이용한 위치 추적 시스템 환경을 제안하고자 한다. 이를 위해 기존 실내의 고정된 위치에 있는 구조/시설물 및 가전제품의 ON/OFF 스위치를 이용하며 기타 추가적인 스위치 및 센서를 부착하여 개폐동작이 일어날 때 발생되는 신호를 검출하여 실제위치를 얻는다. 발생되는 신호는 Pull-up 저항을 이용한 신호 검출 방법으로 눌려진 스위치나 센서에서 발생된 아날로그 신호를 검출한다. 검출된 신호의 고유한 ID값은 Sensor TMO로 송신되어 수집된다. 수집된 센서ID는 소켓통신을 이용하여 홈서버인 실내위치추적시스템으로 보내질 뿐아니라 원격 모니터링 GUI를 통해 실내 거주자의 위치를 GUI의 가상공간 좌표와 매핑된 홈 거주자의 위치를 보인다. 본 논문에서 제안한 실내위치추적시스템은 홈 거주자의 위치를 주기적으로 모니터링하고 거주자의 이동 패턴과 활동 상황을 파악하여 헬스케어 정보로 활용할 예정이다.

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Hybrid Approach Of Indoor Location Tracking System Combing Fingerprint and Geomagnetic (Fingerprint와 지자기를 이용한 실내 위치측위 시스템)

  • Min, Jin Gi;Seo, Hyo-seung;Lee, Joon beom;Song, Dong Hyuk;Kim, Hyeon jung;Son, Bong-Ki;Lee, Jaeho
    • Annual Conference of KIPS
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    • 2016.10a
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    • pp.83-85
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    • 2016
  • 위치측위 시스템들이 발전함에 따라 실내에서도 다양한 방법으로 신뢰성이 높은 실내 위치측위 시스템들이 보편화되고 있는 추세이다. 허나 기술의 한계점으로 지구자기장을 활용한 새로운 기술이 연구되고 있음에도 불구하고, 위 기술 또한 기존 기술들과는 다른 한계점이 존재한다. 이에 따라 본 논문에서는 각각의 기술점의 한계점을 해소하기 위해서 기존 실내측위 시스템과 새롭게 개발 중인 실내 측위 시스템을 혼합하여 외부장비의 의존도를 낮추고 신뢰성 높은 위치측위를 지속적으로 제공할수 있는 혼합형 실내 위치측위 시스템을 제안하고자 한다.

A Study on GPS-based Independent Indoor Location Tracking System Design (GPS기반의 독립형 실내위치추적시스템 설계에 관한 연구)

  • Song, Yu-jin;Jeong, Seong-Ryong;Han, Deok-Soo;Lee, Eun-Joo
    • Annual Conference of KIPS
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    • 2010.11a
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    • pp.1384-1387
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    • 2010
  • 최근 무선인터넷의 기술을 이용한 스마트폰의 활용도가 높아짐에 따라 새로운 서비스의 연구분야로 단말기를 이용하여 이동객체의 위치정보를 제공받는 위치 기반 서비스 기술에 관심이 높아지고 있다. 하지만 현재 기술은 GPS를 이용한 위치추적으로 외부의 이동객체를 추적하는 기술로 많이 활용되고 있다. 그리고 고정된 레퍼런스 노드 또는 마스터 노드에 의존하고 있는 문제점과 위치 계산을 위한 기준이 대부분 홉스나 RF신호의 수신강도에 의한 거리차를 이용하는데 전파 특성에 따른 회절 및 반사, 다중 경로 등에 의한 신호감쇠현상으로 정확도를 보장하지 못하는 문제점이 있다. 따라서 본 논문에서는 GPS와 WiFi를 이용하여 고정된 레퍼런스 노드에 의존하지 않고 이동식 GPS-AP를 이용하여 건물내부에 위치하는 특정 단말기의 위치정보를 제공할 수 있는 시스템을 제안한다.

An Experimental Study on Compensation Algorithm for Localization using Modified Bilateration Technique and Pyroelectric Sensor in a Ship (변형 이변측위기법과 초전센서를 이용한 선내 위치인식 보정 알고리즘에 관한 실험적 연구)

  • Seong, Ju-Hyeon;Choi, Jae-Hyuk;Kim, Jong-Su;Seo, Dong-Hoan
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.18 no.5
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    • pp.488-495
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    • 2012
  • The real-time indoor location technology using radio waves has been studied in a variety of environments. One of them, a ship which consists of steel structure has high reception rate but causes significant ranging error due to the reflection of radio waves. In order to reduce location measurement errors that occurs in such a environment, this paper, based on CSS of IEEE 802.15.4a, presents compensation algorithm for localization using modified bilateration and pyroelectric sensor in a ship. The proposed system reduces the number of fixed nodes by estimating the appropriate reception distance between mobile node and fixed node through the analysis of CSS characteristic in a narrow passage such as ship corridors. Also, in the corner section which the ranging errors are significantly fluctuated due to the reflection and diffraction of radio waves, we recognize the location by tracking the a moving section using modified bilateration technique and pyroelectric sensor. The experimental results show that the location accuracy and efficiency of the proposed algorithm are improved 86.2 % compared to general method.