• Title/Summary/Keyword: Trilateration

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A study on horizontal positing for the seashore reclamation (해안매립을 위한 수평위치 결정에 관한 연구)

  • 문두열
    • Journal of Ocean Engineering and Technology
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    • v.11 no.2
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    • pp.113-121
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    • 1997
  • With the increase use of electromagnrtic distance measuring equiment, is is required that we need to study the higher dimensional applications and detail technical methods. The purpose of this paper is to improve the accuracy of ocean construction surveying and computer programming for determining of horizontal position of a quadrilateral by measuring line on traverse surveyng, trigulation and trilateration. Aa long distance measurements with high accuracy became possible by the apperance of EDM distance measuring instruments, we induced correct adjustment equation through angle condition and area conditionequation. After that we compared and experimental model. From its a result of the practical applicationto quadrilateral, it has been found that its triangulation and traverse surveying algorithms provide better accuracy than trilateration.

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EKF based Mobile Robot Indoor Localization using Pattern Matching (패턴 매칭을 이용한 EKF 기반 이동 로봇 실내 위치 추정)

  • Kim, Seok-Young;Lee, Ji-Hong
    • The Journal of Korea Robotics Society
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    • v.7 no.1
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    • pp.45-56
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    • 2012
  • This paper proposes how to improve the performance of CSS-based indoor localization system. CSS based localization utilizes signal flight time between anchors and tag to estimate distance. From the distances, the 3-dimensional position is calculated through trilateration. However the error in distance caused from multi-path effect transfers to the position error especially in indoor environment. This paper handles a problem of reducing error in raw distance information. And, we propose the new localization method by pattern matching instead of the conventional localization method based on trilateration that is affected heavily on multi-path error. The pattern matching method estimates the position by using the fact that the measured data of near positions possesses a high similarity. In order to gain better performance of localization, we use EKF(Extended Kalman Filter) to fuse the result of CSS based localization and robot model.

Performance Evaluation between Collaborative Ranging and Trilateration Positioning using RSSI in Wireless Sensor Network (무선센서네트워크에서 RSSI를 이용한 협업 거리측정법과 삼각측량법의 효율성평가)

  • Pu, Chuan-Chin;Chung, Wan-Young
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.615-616
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    • 2008
  • Generally, distance between sensor nodes is measured using received signal strength indicator (RSSI) in wireless sensor network (WSN). Since RSSI is not absolutely accurate and stable in indoor environment, the performance of position estimation largely depends on estimation methods. In this paper, performance evaluation is presented to compare trilateration based positioning technique and collaborative ranging (CR) technique. From evaluation results, CR method is shown to be better than trilateration based method in terms of accuracy and precision.

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Study on the Positioning Error of Horizontal Point Fixing by Trilateration (수평위치결정(水平位置決定)에 있어서 3변측량(邊測量) 위치오차(位置誤差)에 관한 연구(研究))

  • Yeu, Bock Mo;Lee, Jong Hun;Yoo, Hwan Hee;Chung, Chang Sik
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.4 no.3
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    • pp.85-91
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    • 1984
  • This paper is a study on the determination of plane coordinates by observing only the distance with EDM (Electromagnetic Distance Measuring instrument). The advent of EDM has made a precise measurements of long distance be possible, therefore many studies on trilateration were made. It is the object of this study to investigate the error distribution of trilateration according to the changing distance and the geometric figure.

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Design of Positioning System using Trilateration Method based on Li-Fi Communication (Li-Fi 통신을 기반으로 삼각측량법을 이용한 측위 시스템 설계)

  • Sagong, Byung-Il;Cheon, Bong-Won;Kim, Nam-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2021.10a
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    • pp.65-67
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    • 2021
  • This thesis is to proposer a new algorithm for a position measurement system using a trilateration method through visible light communication(VLC), by light emitting diode(LED). The length from each LED to the sensor is derived, and location information is found using trilateration method based on the derived length. Unlike th existing positioning system using visible light communication, the proposed positioning system is simpler and more cost effective because it does not require communication between the transmitter and the receiver.

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Real-time Locating Method Applicable to the Mobile Node Partially Out of Communication Reachability (통신 도달성이 결여된 이동노드의 실시간 위치인식 방법)

  • Lee, Kyou-Ho;Jang, Won-Ick
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.11
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    • pp.2463-2470
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    • 2010
  • In some cases of u-health services, it is important and then required to pursue the location of users in real time because users could occasionally be in the situation beyond self-regulation. Location positioning has used two such typical techniques as trilateration and fingerprinting. A trilateration technique is usually based on three resident coordinates to identify the location of the target node. Ranging that measures distances between coordinates and the node is essential for applying the trilateration technique. Users especially in u-health services could be out of reachability in any such reasons as out of propagation ranges, fault of a communication counterpart, non-existence of possible communication facility, etc. This paper proposes a real-time locating method which can improve to identify and track the location of mobile objects. The method is based on references of identified mobile nodes as well as resident coordinates even though they may be partially out of communication reachability.

Adjustment of Plane Trilateration Nets with Fixed Point by Using of Minimum Work Theory (고정점을 갖는 평면 삼변망의 최소일의 원리에 의한 조정)

  • Yang, In Tae
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.7 no.4
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    • pp.133-138
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    • 1987
  • The precise methods applied to adjust plane trilateration nets employ least squares techniques. The observations or the condition equations in these known methods are, without exception, nonlinear. The coefficients of the corrections in the conditions equations methods are lengthy and complicated. This paper presents a new method in which the coefficiets of the corrections of the conditions are simple and can be easily calculated and checked. In this method the measured distances in trilateration nets are considered as elastic members in an internally redundant framework. If the redundant members have measuring errors, axial forces must be applied to fit them in the framework. As a result axial forces will develop in all other members causing changes in their lengths. By applying minimum work techniques one can determine these changes in length which are in fact the required corrections of the measured distances. The result of this study presents that the closing ratio is about 1/145000 and it is improved that this method is useful in analysis plane trilateration nets.

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Precise Indoor Positioning Algorithm for Energy Efficiency Based on BLE Fingerprinting (에너지 효율을 고려한 BLE 핑거프린팅 기반의 정밀 실내 측위 알고리즘)

  • Lee, Dohee;Lee, Jaeho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.41 no.10
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    • pp.1197-1209
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    • 2016
  • As Indoor Positioning System demands due to increased penetration and utilization of smart device, Indoor Positioning System using Wi-Fi or BLE(Bluetooth Low Energy) beacon takes center stage. In this paper, a terminal location of the user is calculated through Microscopic Trilateration using RSSI based on BLE. In the next step, a fingerprinting map appling approximate value of Microscopic Trilateration increases an efficiency of computation amount and energy for Indoor Positioning System. I suggest Indoor Positioning Algorithm based on BLE fingerprinting considering efficiency of energy by conducting precise Trilateration that assure user's terminal position by using AP(Access Point) surrounding targeted fingerprinting cells. And This paper shows experiment and result based on An Suggesting Algorithm in comparison with a fingerprinting based on BLE and Wi-Fi that be used for Indoor Positioning System.

Extended Kalman Filter Method for Wi-Fi Based Indoor Positioning (Wi-Fi 기반 옥내측위를 위한 확장칼만필터 방법)

  • Yim, Jae-Geol;Park, Chan-Sik;Joo, Jae-Hun;Jeong, Seung-Hwan
    • Journal of Information Technology Applications and Management
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    • v.15 no.2
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    • pp.51-65
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    • 2008
  • The purpose of this paper is introducing WiFi based EKF(Extended Kalman Filter) method for indoor positioning. The advantages of our EKF method include: 1) Any special equipment dedicated for positioning is not required. 2) implementation of EKF does not require off-line phase of fingerprinting methods. 3) The EKF effectively minimizes squared deviation of the trilateration method. In order to experimentally prove the advantages of our method, we implemented indoor positioning systems making use of the K-NN(K Nearest Neighbors), Bayesian, decision tree, trilateration, and our EKF methods. Our experimental results show that the average-errors of K-NN, Bayesian and decision tree methods are all close to 2.4 meters whereas the average errors of trilateration and EKF are 4.07 meters and 3.528 meters, respectively. That is, the accuracy of our EKF is a bit inferior to those of fingerprinting methods. Even so, our EKF is accurate enough to be used for practical indoor LBS systems. Moreover, our EKF is easier to implement than fingerprinting methods because it does not require off-line phase.

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Distribution Method of BLE Fingerprinting for Large Scale Indoor Envirement (광범위 분산처리 기반 BLE 핑거프린팅 실내 측위 기법)

  • Lee, Dohee;Son, Bong-Ki;Lee, Jaeho
    • KIPS Transactions on Computer and Communication Systems
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    • v.5 no.10
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    • pp.373-378
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    • 2016
  • Recently, IPS(Indoor Positioning System) Technology has been progressing study and research, It has been studied in the fingerprinting and trilateration continuously. however because Fingerprinting and Trilateration Technology use AP(Access Point) for Positioning Calculation, Fingerprinting and Trilateration are not never had a credit positioning accuracy by using unstable RSSI in large scale. in this paper, to improve the problem about precise positioning in wide area, we introduced a concept of Sector including Cell. Sectors are not involved in each other and only fingerprinting calculation is proceed in a sector. we suggest this fingerprinting system considering efficiency and accuracy and compared to conventional fingerprinting, we demonstrated our system efficiency by mathematical techniques.