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Uncertainties In Gps Positioning

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Uncertainties in GPS Positioning

Uncertainties in GPS Positioning Book
Author : Alan Oxley
Publisher : Academic Press
Release : 2017-01-17
ISBN : 0128097876
Language : En, Es, Fr & De

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Book Description :

Uncertainties in GPS Positioning: A Mathematical Discourse describes the calculations performed by a GPS receiver and the problems associated with ensuring that the derived location is a close match to the actual location. Inaccuracies in calculating a location can have serious repercussions, so this book is a timely source for information on this rapidly evolving technology. Covers how a GPS receiver works and how the earth is modeled so position data can be calculated Discusses the different signals and clock speeds of the satellites, the receivers, and sources of inaccuracy Examines how the errors are distributed in the data and provides examples

Guide to GPS Positioning

Guide to GPS Positioning Book
Author : David E. Wells,Norman Beck,Canadian GPS Associates
Publisher : Larry d Hothem
Release : 1987
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

"The Guide to GPS Positioning is a self-contained introduction to the Global Positioning System, designed to be used in any of the following three ways: as a self-study guide, as lecture notes for formal post-secondary education courses, or as hand-out material to support short-course and seminar presentations on GPS." -- Introduction.

Principles of Modeling Uncertainties in Spatial Data and Spatial Analyses

Principles of Modeling Uncertainties in Spatial Data and Spatial Analyses Book
Author : Wenzhong Shi
Publisher : CRC Press
Release : 2009-09-30
ISBN : 1420059289
Language : En, Es, Fr & De

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Book Description :

When compared to classical sciences such as math, with roots in prehistory, and physics, with roots in antiquity, geographical information science (GISci) is the new kid on the block. Its theoretical foundations are therefore still developing and data quality and uncertainty modeling for spatial data and spatial analysis is an important branch of t

Positioning with GPS 1985

Positioning with GPS 1985 Book
Author : Anonim
Publisher : Unknown
Release : 1985
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Positioning with GPS 1985 book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Real time Estimation of Travel Time Using Low Frequency GPS Data from Moving Sensors

Real time Estimation of Travel Time Using Low Frequency GPS Data from Moving Sensors Book
Author : Irum Sanaullah
Publisher : Unknown
Release : 2013
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Travel time is one of the most important inputs in many Intelligent Transport Systems (ITS). As a result, this information needs to be accurate and dynamic in both spatial and temporal dimensions. For the estimation of travel time, data from fixed sensors such as Inductive Loop Detectors (ILD) and cameras have been widely used since the 1960 s. However, data from fixed sensors may not be sufficiently reliable to estimate travel time due to a combination of limited coverage and low quality data resulting from the high cost of implementing and operating these systems. Such issues are particularly critical in the context of Less Developed Countries, where traffic levels and associated problems are increasing even more rapidly than in Europe and North America, and where there are no pre-existing traffic monitoring systems in place. As a consequence, recent developments have focused on utilising moving sensors (i.e. probe vehicles and/or people equipped with GPS: for instance, navigation and route guidance devices, mobile phones and smartphones) to provide accurate speed, positioning and timing data to estimate travel time. However, data from GPS also have errors, especially for positioning fixes in urban areas. Therefore, map-matching techniques are generally applied to match raw positioning data onto the correct road segments so as to reliably estimate link travel time. This is challenging because most current map-matching methods are suitable for high frequency GPS positioning data (e.g. data with 1 second interval) and may not be appropriate for low frequency data (e.g. data with 30 or 60 second intervals). Yet, many moving sensors only retain low frequency data so as to reduce the cost of data storage and transmission. The accuracy of travel time estimation using data from moving sensors also depends on a range of other factors, for instance vehicle fleet sample size (i.e. proportion of vehicles equipped with GPS); coverage of links (i.e. proportion of links on which GPS-equipped vehicles travel); GPS data sampling frequency (e.g. 3, 6, 30, 60 seconds) and time window length (e.g. 5, 10 and 15 minutes). Existing methods of estimating travel time from GPS data are not capable of simultaneously taking into account the issues related to uncertainties associated with GPS and spatial road network data; low sampling frequency; low density vehicle coverage on some roads on the network; time window length; and vehicle fleet sample size. Accordingly this research is based on the development and application of a methodology which uses GPS data to reliably estimate travel time in real-time while considering the factors including vehicle fleet sample size, data sampling frequency and time window length in the estimation process. Specifically, the purpose of this thesis was to first determine the accurate location of a vehicle travelling on a road link by applying a map-matching algorithm at a range of sampling frequencies to reduce the potential errors associated with GPS and digital road maps, for example where vehicles are sometimes assigned to the wrong road links. Secondly, four different methods have been developed to estimate link travel time based on map-matched GPS positions and speed data from low frequency data sets in three time windows lengths (i.e. 5, 10 and 15 minutes). These are based on vehicle speeds, speed limits, link distances and average speeds; initially only within the given link but subsequently in the adjacent links too. More specifically, the final method draws on weighted link travel times associated with the given and adjacent links in both spatial and temporal dimensions to estimate link travel time for the given link. GPS data from Interstate I-880 (California, USA) for a total of 73 vehicles over 6 hours were obtained from the UC-Berkeley s Mobile Century Project. The original GPS dataset which was broadcast on a 3 second sampling frequency has been extracted at different sampling frequencies such as 6, 30, 60 and 120 seconds so as to evaluate the performance of each travel time estimation method at low sampling frequencies. The results were then validated against reference travel time data collected from 4,126 vehicles by high resolution video cameras, and these indicate that factors such as vehicle sample size, data sampling frequency, vehicle coverage on the links and time window length all influence the accuracy of link travel time estimation.

The International Hydrographic Review

The International Hydrographic Review Book
Author : Anonim
Publisher : Unknown
Release : 1993
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Vol. 27- include section: International hydrographic bibliography (title varies).

Proceedings of the IEEE 1978 National Aerospace and Electronics Conference NAECON 78 Held at the Dayton Convention Center May 16 18 1978

Proceedings of the IEEE 1978 National Aerospace and Electronics Conference  NAECON  78  Held at the Dayton Convention Center  May 16 18  1978 Book
Author : Anonim
Publisher : Unknown
Release : 1978
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Proceedings of the IEEE 1978 National Aerospace and Electronics Conference NAECON 78 Held at the Dayton Convention Center May 16 18 1978 book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

MTS 92 Global Ocean Partnership p 426 to 1073

MTS  92  Global Ocean Partnership  p  426 to 1073 Book
Author : Anonim
Publisher : Unknown
Release : 1992
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download MTS 92 Global Ocean Partnership p 426 to 1073 book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Journal of the Indian Institute of Science

Journal of the Indian Institute of Science Book
Author : Indian Institute of Science, Bangalore
Publisher : Unknown
Release : 2002
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Journal of the Indian Institute of Science book written by Indian Institute of Science, Bangalore, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

IEEE 1994 Position Location and Navigation Symposium

IEEE 1994 Position Location and Navigation Symposium Book
Author : Anonim
Publisher : Institute of Electrical & Electronics Engineers(IEEE)
Release : 1994
ISBN : 9780780314351
Language : En, Es, Fr & De

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Book Description :

Download IEEE 1994 Position Location and Navigation Symposium book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Dissertation Abstracts International

Dissertation Abstracts International Book
Author : Anonim
Publisher : Unknown
Release : 2008
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Dissertation Abstracts International book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

International Aerospace Abstracts

International Aerospace Abstracts Book
Author : Anonim
Publisher : Unknown
Release : 1999
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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Accurate Time and Frequency Transfer During Common view of a GPS Satellite

Accurate Time and Frequency Transfer During Common view of a GPS Satellite Book
Author : David W. Allan
Publisher : Unknown
Release : 1980
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Even though the Global Positioning System (GPS) is primarily a navigation system, if two clocks at known coordinates A and B are in common view of a single GPS satellite, receivers at these two clock sites may concidentally receive transmitted GPS clock times. By subtracting the received times of arrivals as measured by clocks A and B at the two sites, while compensating for the propagation delays, one has an accurate measure of the time difference between clock A and clock B. When all of the error contributions are assessed, it appears that 1 ns time stability and 10 ns of time accuracy should be achievable in measuring remote clocks, at distances of the order of a few thousand km. The primary error sources are as follows: (1) uncertainties in the satellite ephemeris, (2) differential ionospheric delays, (3) uncertainties in tropospheric delay estimation, and (4) uncertainties in receiver delays. This common-view approach has been chosen because it provides an opportunity for a high-accuracy (10 ns), relatively low-cost receiver, due to the common-view error cancellation achievable.

GPS World

GPS World Book
Author : Anonim
Publisher : Unknown
Release : 1997
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download GPS World book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Nuts Volts Magazine

Nuts   Volts Magazine Book
Author : Anonim
Publisher : Unknown
Release : 2003
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Nuts Volts Magazine book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Radio Science

Radio Science Book
Author : Anonim
Publisher : Unknown
Release : 2006
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Radio Science book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Geomatics

Geomatics Book
Author : Barry F. Kavanagh
Publisher : Pearson College Division
Release : 2003
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

This state-of-the-art exploration of the theory and applications of geometrics recognizes the expansion and advances in the field and the broadening of the allied disciplines that have a direct interest in the newest technological approaches to geo-data collection, processing, analysis, management, and presentation. Exceptionally well-written by a teacher/surveyor manager with many years of experience, it provides a comprehensive insider's view of what's important, what works, and how it all fits together. Divided into three parts—Fundamentals, Remote Sensing, and Engineering Applications—it covers both traditional topics in surveying and the more recently developed topics in geographic information systems (GIS), global positioning (GPS) and airborne imagery, together with satellite imagery (remote sensing)—all with a focus on applications of interest to the fields of in civil, surveying, and geological engineering, physical geography, environmental, natural resources, etc. Features an appendix of 11 field projects involving the fundamentals of taping, leveling, and angle acquisition, and applications in data gathering, stake-outs for buildings, curves, and pipelines. An Introduction to Geometrics. Distance Measurement—Taping. Electronic Distance Measurement (EDM). Leveling. Angles and Directions. Transits/Theodolites. Traverse Surveys. Electronic Surveying Measurements. Topographic Surveying and Mapping. Geogramic Information Systems (GIS). Global Positioning Systems (GPS). Control Surveys. Land Surveying. Airborne Imagery. Satellite Imagery. Highway Curves. Construction Surveying. For anyone interested in the state-of-the-art theory and applications of Geomatics/Surveying.

Canadian Special Publication of Fisheries and Aquatic Sciences

Canadian Special Publication of Fisheries and Aquatic Sciences Book
Author : Anonim
Publisher : Unknown
Release : 1983
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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Expanded Abstracts with Biographies

Expanded Abstracts with Biographies Book
Author : Anonim
Publisher : Unknown
Release : 1989
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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