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Special Issue "Selected Papers from UPINLBS 2018"

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Remote Sensors".

Deadline for manuscript submissions: 31 December 2018

Special Issue Editors

Guest Editor
Prof. Dr. Ruizhi Chen

State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China;
Collaborative Innovation Center of Geospatial Technology (INNOGST), Wuhan 430079, China
Website | E-Mail
Interests: Positioning and Navigation with GNSS; Smartphone positioning indoors/outdoors; context awareness and satellite navigation
Guest Editor
Prof. Dr. Günther Retscher

Engineering Geodesy, Institute of Geodesy and Geophysics, Vienna University of Technology, Austria
Website | E-Mail
Interests: Positioning and Navigation with GNSS; Location Based Services (LBS); Indoor and Pedestrian Navigation; Applications of Multi-sensor Systems
Guest Editor
Prof. Dr. Xiaoji Niu

GNSS Research Center of Wuhan University, Wuhan 430079, China;
National Engineering Center for Satellite Positioning System
Website | E-Mail
Interests: High precision GNSS/INS Position and Orientation System; GNSS/INS deep integration; MEMS GNSS/INS integration technologies for land vehicles and UAV; Inertial Surveying
Guest Editor
Prof. Dr. Liang Chen

State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China;
Collaborative Innovation Center of Geospatial Technology (INNOGST), Wuhan 430079, China
Website | E-Mail
Interests: Positioning and Navigation; signal processing and information fusion; Location Based Services (LBS); Indoor and Pedestrian Navigation; Applications of Multi-sensor Systems
Guest Editor
Dr. Yuanjin Pan

State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
Website | E-Mail
Interests: GNSS processing; Geodynamics of earth science; Indoor Positioning

Special Issue Information

Dear Colleagues,

A selection of high quality works presented in the fifth international UPINLBS (Ubiquitous positioning, Indoor Navigation and Location-Based Services) conference will be recommended to the Special Issue of the Journal MDPI Sensors: ‘Selected Papers from UPINLBS 2018 Conference’. The UPINLBS is a unique forum for scientific and technological exchange among global researchers in the field of sensors for indoor/outdoor navigation and positioning. This Conference has a long tradition starting from the year 2010 in Finland and has been held every two years in different cities in the world: Masala, Finland (2010), Helsinki, Finland (2012), Texas, USA (2014), and Shanghai, China (2016). In 2018, the fifth UPINLBS will be held in Wuhan, China (http://unsc.whu.edu.cn/upinlbs/).

This conference concentrate on innovative, state-of-the-art solutions and techniques dealing with ubiquitous positioning, indoor navigation and location-based technologies. In addition, it covers sessions on GNSS based positioning indoors/outdoors, Positioning based on wireless sensor networks, Positioning based on signals of opportunity, Indoor navigation and so much more. Steady progress and the increasing interest in the localization-based services and indoor navigation has contributed to promote the potential of our community in this field, which constitutes one of the most significant and fast developing scientific activities on a worldwide scale.

We invite investigators to contribute original research articles, as well as review articles, to this Special Issue. Potential topics include, but are not limited to:

  • GNSS based positioning indoors/outdoors
  • Positioning based on wireless sensor networks
  • Positioning based on signals of opportunity
  • Positioning based on acoustic signals
  • Positioning based on emerging sensors
  • Hybrid positioning solutions with multiple sensors
  • Indoor navigation
  • Indoor mapping
  • Location-based services indoors/outdoors
  • Mobile sensing with smartphones/wearable devices
  • Geospatial data crowdsourcing
  • Mobile GIS
  • Context inference and awareness
Prof. Dr. Ruizhi Chen
Prof. Dr. Guenther Guenther Retscher
Prof. Dr. Xiaoji Niu
Prof. Dr. Liang Liang Chen
Dr. Yuanjin Pan
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (3 papers)

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Research

Open AccessArticle A Novel Carrier Loop Algorithm Based on Maximum Likelihood Estimation (MLE) and Kalman Filter (KF) for Weak TC-OFDM Signals
Sensors 2018, 18(7), 2256; https://doi.org/10.3390/s18072256
Received: 16 May 2018 / Revised: 25 June 2018 / Accepted: 9 July 2018 / Published: 13 July 2018
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Abstract
Digital broadcasting signals represent a promising positioning signal for indoors applications. A novel positioning technology named Time & Code Division-Orthogonal Frequency Division Multiplexing (TC-OFDM) is mainly discussed in this paper, which is based on China mobile multimedia broadcasting (CMMB). Signal strength is an
[...] Read more.
Digital broadcasting signals represent a promising positioning signal for indoors applications. A novel positioning technology named Time & Code Division-Orthogonal Frequency Division Multiplexing (TC-OFDM) is mainly discussed in this paper, which is based on China mobile multimedia broadcasting (CMMB). Signal strength is an important factor that affects the carrier loop performance of the TC-OFDM receiver. In the case of weak TC-OFDM signals, the current carrier loop algorithm has large residual carrier errors, which limit the tracking sensitivity of the existing carrier loop in complex indoor environments. This paper proposes a novel carrier loop algorithm based on Maximum Likelihood Estimation (MLE) and Kalman Filter (KF) to solve the above problem. The discriminator of the current carrier loop is replaced by the MLE discriminator function in the proposed algorithm. The Levenberg-Marquardt (LM) algorithm is utilized to obtain the MLE cost function consisting of signal amplitude, residual carrier frequency and carrier phase, and the MLE discriminator function is derived from the corresponding MLE cost function. The KF is used to smooth the MLE discriminator function results, which takes the carrier phase estimation, the angular frequency estimation and the angular frequency rate as the state vector. Theoretical analysis and simulation results show that the proposed algorithm can improve the tracking sensitivity of the TC-OFDM receiver by taking full advantage of the characteristics of the carrier loop parameters. Compared with the current carrier loop algorithms, the tracking sensitivity is effectively improved by 2–4 dB, and the better performance of the proposed algorithm is verified in the real environment. Full article
(This article belongs to the Special Issue Selected Papers from UPINLBS 2018)
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Open AccessArticle An Indoor Positioning System Based on Static Objects in Large Indoor Scenes by Using Smartphone Cameras
Sensors 2018, 18(7), 2229; https://doi.org/10.3390/s18072229
Received: 4 June 2018 / Revised: 8 July 2018 / Accepted: 9 July 2018 / Published: 11 July 2018
PDF Full-text (7016 KB) | HTML Full-text | XML Full-text
Abstract
The demand for location-based services (LBS) in large indoor spaces, such as airports, shopping malls, museums and libraries, has been increasing in recent years. However, there is still no fully applicable solution for indoor positioning and navigation like Global Navigation Satellite System (GNSS)
[...] Read more.
The demand for location-based services (LBS) in large indoor spaces, such as airports, shopping malls, museums and libraries, has been increasing in recent years. However, there is still no fully applicable solution for indoor positioning and navigation like Global Navigation Satellite System (GNSS) solutions in outdoor environments. Positioning in indoor scenes by using smartphone cameras has its own advantages: no additional needed infrastructure, low cost and a large potential market due to the popularity of smartphones, etc. However, existing methods or systems based on smartphone cameras and visual algorithms have their own limitations when implemented in relatively large indoor spaces. To deal with this problem, we designed an indoor positioning system to locate users in large indoor scenes. The system uses common static objects as references, e.g., doors and windows, to locate users. By using smartphone cameras, our proposed system is able to detect static objects in large indoor spaces and then calculate the smartphones’ position to locate users. The system integrates algorithms of deep learning and computer vision. Its cost is low because it does not require additional infrastructure. Experiments in an art museum with a complicated visual environment suggest that this method is able to achieve positioning accuracy within 1 m. Full article
(This article belongs to the Special Issue Selected Papers from UPINLBS 2018)
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Open AccessArticle Unsupervised Indoor Localization Based on Smartphone Sensors, iBeacon and Wi-Fi
Sensors 2018, 18(5), 1378; https://doi.org/10.3390/s18051378
Received: 29 March 2018 / Revised: 23 April 2018 / Accepted: 24 April 2018 / Published: 28 April 2018
PDF Full-text (7385 KB) | HTML Full-text | XML Full-text
Abstract
In this paper, we propose UILoc, an unsupervised indoor localization scheme that uses a combination of smartphone sensors, iBeacons and Wi-Fi fingerprints for reliable and accurate indoor localization with zero labor cost. Firstly, compared with the fingerprint-based method, the UILoc system can build
[...] Read more.
In this paper, we propose UILoc, an unsupervised indoor localization scheme that uses a combination of smartphone sensors, iBeacons and Wi-Fi fingerprints for reliable and accurate indoor localization with zero labor cost. Firstly, compared with the fingerprint-based method, the UILoc system can build a fingerprint database automatically without any site survey and the database will be applied in the fingerprint localization algorithm. Secondly, since the initial position is vital to the system, UILoc will provide the basic location estimation through the pedestrian dead reckoning (PDR) method. To provide accurate initial localization, this paper proposes an initial localization module, a weighted fusion algorithm combined with a k-nearest neighbors (KNN) algorithm and a least squares algorithm. In UILoc, we have also designed a reliable model to reduce the landmark correction error. Experimental results show that the UILoc can provide accurate positioning, the average localization error is about 1.1 m in the steady state, and the maximum error is 2.77 m. Full article
(This article belongs to the Special Issue Selected Papers from UPINLBS 2018)
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