Results 71 to 80 of about 436,322 (188)

An opportunistic indoors positioning scheme based on estimated positions [PDF]

, 2009
The localization requirements for mobile nodes in wireless (sensor) networks are increasing. However, most research works are based on range measurements between nodes which are often oversensitive to the measurement error.
Diaz, Michel, Kang, GuoDong, Pérennou, Tanguy   +2 more
core   +6 more sources

GPS precise point positioning for UAV photogrammetry [PDF]

The Photogrammetric Record, 2018
AbstractThe use of Global Positioning System (GPS) precise point positioning (PPP) on a fixed‐wing unmanned aerial vehicle (UAV) is demonstrated for photogrammetric mapping at accuracies of centimetres in planimetry and about a decimetre in height, from flights of 25 to 30 minutes in duration.
Grayson B, Penna NT, Mills JP, Grant DS
openaire   +2 more sources

Ultra-Low-Cost Real-Time Precise Point Positioning Using Different Streams for Precise Positioning and Precipitable Water Vapor Retrieval Estimates

Algorithms
This article aims to examine the real-time precise point positioning (PPP) solution’s accuracy utilizing the low-cost dual-frequency multi-constellation U-blox ZED-F9P module and real-time GNSS orbit and clock products from five analysis centers ...
Mohamed Abdelazeem, Amgad Abazeed, Hussain A. Kamal, Mudathir O. A. Mohamed   +3 more
doaj   +1 more source

An Analytical Model for Repositioning of 6 D.O.F Fixturing System [PDF]

, 2012
Lien vers la version éditeur: http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8749247&fulltextType=RA&fileId=S2257777712000164Dimensional errors of the parts from a part family cause the initial misplacement of the workpiece on ...
ANTOINE, Jean-François, BUTT, Sajid-Ullah, MARTIN, Patrick   +2 more
core   +7 more sources

Monitoring rail infrastructure using multisensor navigation on a moving platform and autonomous robots [PDF]

, 2017
RailSat aims to use Global Navigation Satellite System (GNSS) to monitor and maintain railway assets and its surrounding environment by railway asset owners and/or other relevant stakeholders.
Bhatia, Paul, Bonenberg, Lukasz K., Hill, Chris, Jing, Hao, Meng, Xiaolin, Moore, Terry, Roberts, Simon J., Sowter, Andrew   +7 more
core   +1 more source

Multi-GNSS Combined Precise Point Positioning Using Additional Observations with Opposite Weight for Real-Time Quality Control

Remote Sensing, 2019
The emergence of multiple global navigation satellite systems (multi-GNSS), including global positioning system (GPS), global navigation satellite system (GLONASS), Beidou navigation satellite system (BDS), and Galileo, brings not only great ...
Wenju Fu, Guanwen Huang, Yuanxi Yang, Qin Zhang, Bobin Cui, Maorong Ge, Harald Schuh   +6 more
doaj   +1 more source

Deflection and frequency monitoring of the Forth Road Bridge, Scotland, by GPS [PDF]

, 2012
Permission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees. Copyright © 2012 Thomas Telford Ltd.The use of carrier phase kinematic GPS (global positioning system) has evolved ...
Atkins, C, Brown, CJ, Colford, B, Meng, X, Ogundipe, O, Roberts, GW   +5 more
core   +2 more sources

Real-Time Precise Point Positioning Method Considering Broadcast Ephemeris Discontinuities

Navigation
With advancements in the broadcast ephemeris accuracy of global navigation satellite systems (GNSSs), precise point positioning based on broadcast ephemeris (BE-PPP) is gradually showing promising prospects.
Quanrun Cheng, Junping Chen, Yize Zhang, Chao Yu   +3 more
doaj   +1 more source

Weighting of Multi-GNSS Observations in Real-Time Precise Point Positioning

Remote Sensing, 2018
The combination of Global Navigation Satellite Systems (GNSS) may improve the accuracy and precision of estimated coordinates, as well as the convergence time of Precise Point Positioning (PPP) solutions.
Kamil Kazmierski, Tomasz Hadas, Krzysztof Sośnica   +2 more
doaj   +1 more source

ACCURACY TESTING OF THE ONLINE FREE GNSS PPP SERVICES, AS A FUNCION OF OBSERVATION DURATION AND THE ELAPSED TIME FROM MEASUREMENT EPOCH TO EPOCH OF MEASUREMENT COMPUTATION [PDF]

Geodetski Glasnik, 2011
Use of PPP has become possible since the advent of precise satellite ephemerides and clock corrections from IGS. This work represents a research in attainable accuracy and reliability of the free online GNSS services (APPS, CSRS, GAPS, magicGNSS ...
Denis Tabučić, Medžida Mulić, Asim Bilajbegović   +2 more
doaj   +1 more source