Errors in GPS. Errors in GPS. Geodetic Co-ordinate system. R. Khosla Fall Semester
|
|
- Monica Edwards
- 6 years ago
- Views:
Transcription
1 Errors in GPS Errors in GPS GPS is currently the most accurate positioning system available globally. Although we are talking about extreme precision and measuring distances by speed of light, yet there are several sources of errors in GPS. The designers of GPS did a great job of protecting it from potential problems, but even so, some small errors cannot be entirely eliminated by the basic system. Geodetic Coordinate system Question of Error? Accuracy? With Reference to WHAT? Geodetic Coordinate System: A set of rules for specifying how coordinates are to be assigned to positions on the surface of the earth. Defined by X,Y,Z on an Ellipsoid Sphere Geoid Equal gravity Ellipsoid What we like to think the earth is shaped like Equipotential gravimetric surface (sealevel) Assuming sea level everywhere Best fitting mathematical shape R. Khosla Fall Semester
2 Geodetic Height Ellipsoid It is an imaginary sphere similar to the shape of earth. [Earth is not a perfect sphere] Ellipsoid is a simple geometric surface that can be defined by mathematical equation Ellipsoid vs Geoid Ellipsoid Mathematical Definition Simple Geometrical Surface Described By 2 Parameters Cannot be sensed by instruments Geoid Physical Definition Complicated Surface Described by infinite # patterns Can be sensed by instruments Best fitting ellipsoid Ellipsoidal surface Geoidal surface Simple terms: Geodetic height is the difference between the Ellipsoid height and height above mean sea level (elevation). Geodetic coordinate systems DMA: Defense Mapping Agency since 1960 WGS 60, 66, 72, 84 New ones are coming as our understanding of the earth improves R. Khosla Fall Semester
3 What s so special about GPS heights GPSHeights are defined with respect to the Ellipsoid NOT the geoidal height or Mean Sea Level what we are used to in our daily lives The height of the surface of the infinitely lumpy actual surface of the Earth above (or occasionally below) sea level is referred to as Orthometric Height GPS heights are not much accurate No SV s below the earth is visible The earth is opaque One sided geometry results in ½ Optimal configuration Vertical accuracy typically ½ that of horizontal Best fitting ellipsoid Ellipsoidal surface Orthometric surface Geoidal surface Sources of GPS Errors Ionospheric and Atmospheric Errors Satellite Clock Errors Orbital Errors Multipath Errors Receiver Errors Induced Errors or Selective Availability Ionospheric and Atmospheric Errors km Satellite orbit 200 km 50 km Inonosphere Ions Troposphere Water vapor R. Khosla Fall Semester
4 Ionospheric and Atmospheric Errors Ionosphere is a blanket of electrically charged particles kms above the earth surface. These particles affect the speed of light and effect the speed of GPS radio signals. Refraction Ideal Real situation Mitigating Atmospheric Errors L1 Carrier (higher freq.) L2 Carrier (lower freq.) By using both frequencies, it is possible to infer the error generated by the atmosphere. Mitigating Atmospheric Errors Using a 15 mask to minimize refraction error 15 R. Khosla Fall Semester
5 Multipath errors Multipath errors Selective Availability (S/A) The degradation of position accuracy by the DoD Done to deny hostiles high accuracy positioning Done by: Offsetting SV clocks Injection of Ephemeris error (orbital position) With S/A On: ~100 meters(2drms) With S/A Off: ~20 40 meters (2DRMS) DRMS: Distance Root Mean Square 1DRMS = 68% 2DRMS = 95% R. Khosla Fall Semester
6 Sources of error 1 SV clock error (0 to 1.5 m) 2 Orbital error (1 to 5 m) 3 Atmospheric refraction Ionosphere: 0 to 30 m Troposphere: 0 to 30 m 4 Multipath (0 to 1 m) 5 Receiver noise (0 to 10 m) 6 Selective availability (0 to 70 m) GPS Error Budget Satellite Clock error m SV Ephemeris error 1 5 m Ionospheric Refraction 0 30 m Tropospheric Refraction 0 30 m Multipath 0 1 m Receiver Noise 0 10 m Selective Availability 0 70 m Dilution Of Precision: Above x 1 6 Total Error with Selective Availability on: ~100 m Total Error with Selective Availability off: ~28 m = ~ 90ft Geometric Precision The position can be better or worse depending on which satellites the receiver is using to make a position measurement. Not that one satellite is better than another It depends on the relative angle of satellite in the sky In simple terms, the wider the angle between satellites the better the measurement. R. Khosla Fall Semester
7 Good DOP Dilution of Precision Poor DOP Dilution of Precision Dilution of Precision Area of ambiguity R. Khosla Fall Semester
8 Dilution of Precision Area of ambiguity Precision is diluted in a larger area Dilution of Precision GDOP = Geometric Dilution of Precision PDOP = Position Dilution of Precision (Most commonly used) 3D VDOP = Vertical Dilution of Precision HDOP = Horizontal Dilution of Precision TDOP = Time Dilution of Precision QUALITY Very good DOP 1 3(considered good) Good 4 5 Fair 6 Suspect >6 R. Khosla Fall Semester
FieldGenius Technical Notes GPS Terminology
FieldGenius Technical Notes GPS Terminology Almanac A set of Keplerian orbital parameters which allow the satellite positions to be predicted into the future. Ambiguity An integer value of the number of
More informationChapter 6 GPS Relative Positioning Determination Concepts
Chapter 6 GPS Relative Positioning Determination Concepts 6-1. General Absolute positioning, as discussed earlier, will not provide the accuracies needed for most USACE control projects due to existing
More informationGlobal Positioning System: what it is and how we use it for measuring the earth s movement. May 5, 2009
Global Positioning System: what it is and how we use it for measuring the earth s movement. May 5, 2009 References Lectures from K. Larson s Introduction to GNSS http://www.colorado.edu/engineering/asen/
More informationENGI 3703 Surveying and Geomatics
Satellite Geometry: Satellites well spread out in the sky have a much stronger solution to the resection type problem (aka trilateration) then satellite that are grouped together. Since the position of
More informationUNIT 1 - introduction to GPS
UNIT 1 - introduction to GPS 1. GPS SIGNAL Each GPS satellite transmit two signal for positioning purposes: L1 signal (carrier frequency of 1,575.42 MHz). Modulated onto the L1 carrier are two pseudorandom
More informationGlobal Positioning System (GPS) Positioning Errors During Ionospheric Scintillation Event. Keywords: GPS; scintillation; positioning error
Jurnal Teknologi Full paper Global Positioning System (GPS) Positioning Errors During Ionospheric Scintillation Event Y. H. Ho a*, S. Abdullah b, M. H. Mokhtar b a Faculty of Electronic and Computer Engineering,
More informationGNSS & Coordinate Systems
GNSS & Coordinate Systems Matthew McAdam, Marcelo Santos University of New Brunswick, Department of Geodesy and Geomatics Engineering, Fredericton, NB May 29, 2012 Santos, 2004 msantos@unb.ca 1 GNSS GNSS
More informationWhat is a GPS How does GPS work? GPS Segments GPS P osition Position Position Accuracy Accuracy Accuracy GPS A pplications Applications Applications
What is GPS? What is a GPS How does GPS work? GPS Segments GPS Position Accuracy GPS Applications What is GPS? The Global Positioning System (GPS) is a precise worldwide radio-navigation system, and consists
More informationResection. We can measure direction in the real world! Lecture 10: Position Determination. Resection Example: Isola, Slovenia. Professor Keith Clarke
Geography 12: Maps and Spatial Reasoning Lecture 10: Position Determination We can measure direction in the real world! Professor Keith Clarke Resection Resection Example: Isola, Slovenia Back azimuth
More informationGlobal Positioning Systems -GPS
Global Positioning Systems -GPS GPS Why? What is it? How does it work? Differential GPS How can it help me? GPS Why?? Where am I? How do I get there? Where are you, and how do I get to You? WHO CARES???
More informationGlobal Positioning Systems - GPS
Global Positioning Systems - GPS GPS Why? What is it? How does it work? Differential GPS How can it help me? GPS Why?? Where am I? How do I get there? Where are you, and how do I get to You? WHO CARES???
More informationGPS Basics. Introduction to GPS (Global Positioning System) Version 1.0 English
20 30 40 50 GPS Basics Introduction to GPS (Global Positioning System) Version 1.0 English Contents Preface... 4 1. What is GPS and what does it do?... 5 2. System Overview... 6 2.1 The Space Segment...
More informationSources of Error in Satellite Navigation Positioning
http://www.transnav.eu the International Journal on Marine Navigation and Safety of Sea Transportation Volume 11 Number 3 September 2017 DOI: 10.12716/1001.11.03.04 Sources of Error in Satellite Navigation
More informationGLOBAL POSITIONING SYSTEMS. Knowing where and when
GLOBAL POSITIONING SYSTEMS Knowing where and when Overview Continuous position fixes Worldwide coverage Latitude/Longitude/Height Centimeter accuracy Accurate time Feasibility studies begun in 1960 s.
More informationIntroduction to the Global Positioning System
GPS for Fire Management - 2004 Introduction to the Global Positioning System Pre-Work Pre-Work Objectives Describe at least three sources of GPS signal error, and identify ways to mitigate or reduce those
More informationGPS POSITIONING GUIDE
GPS POSITIONING GUIDE (July 1993) Third printing July 1995 This product is available from: Natural Resources Canada* Geomatics Canada Geodetic Survey Division Information Services 615 Booth Street Ottawa,
More informationThe Global Positioning System
The Global Positioning System 5-1 US GPS Facts of Note DoD navigation system First launch on 22 Feb 1978, fully operational in 1994 ~$15 billion (?) invested to date 24 (+/-) Earth-orbiting satellites
More informationGPS Milestones, cont. GPS Milestones. The Global Positioning Sytem, Part 1 10/10/2017. M. Helper, GEO 327G/386G, UT Austin 1. US GPS Facts of Note
The Global Positioning System US GPS Facts of Note DoD navigation system First launch on 22 Feb 1978, fully operational in 1994 ~$15 billion (?) invested to date 24 (+/-) Earth-orbiting satellites (SVs)
More informationGNSS 101 Bringing It Down To Earth
GNSS 101 Bringing It Down To Earth Steve Richter Frontier Precision, Inc. UTM County Coordinates NGVD 29 State Plane Datums Scale Factors Projections Session Agenda GNSS History & Basic Theory Coordinate
More informationLeveling By Using Global Positioning System
Mansoura University Faculty of Engineering Public Works Eng. Department Leveling By Using Global Positioning System By Eng./ Mosbeh Rashed Mosbeh Kaloop B.Sc. Civil Engineering - Mansoura University, 2002
More informationPDHonline Course L105 (12 PDH) GPS Surveying. Instructor: Jan Van Sickle, P.L.S. PDH Online PDH Center
PDHonline Course L105 (12 PDH) GPS Surveying Instructor: Jan Van Sickle, P.L.S. 2012 PDH Online PDH Center 5272 Meadow Estates Drive Fairfax, VA 22030-6658 Phone & Fax: 703-988-0088 www.pdhonline.org www.pdhcenter.com
More informationLecture # 7 Coordinate systems and georeferencing
Lecture # 7 Coordinate systems and georeferencing Coordinate Systems Coordinate reference on a plane Coordinate reference on a sphere Coordinate reference on a plane Coordinates are a convenient way of
More informationGlobal Positioning Systems (GPS) Trails: the achilles heel of mapping from the air / satellites
Global Positioning Systems (GPS) Trails: the achilles heel of mapping from the air / satellites Google maps updated regularly by local users using GPS Also: http://openstreetmaps.org GPS applications
More informationGPS STATIC-PPP POSITIONING ACCURACY VARIATION WITH OBSERVATION RECORDING INTERVAL FOR HYDROGRAPHIC APPLICATIONS (ASWAN, EGYPT)
GPS STATIC-PPP POSITIONING ACCURACY VARIATION WITH OBSERVATION RECORDING INTERVAL FOR HYDROGRAPHIC APPLICATIONS (ASWAN, EGYPT) Ashraf Farah Associate Professor,College of Engineering, Aswan University,
More informationGPS Error and Biases
Component-I(A) - Personal Details Role Name Affiliation Principal Investigator Prof.MasoodAhsanSiddiqui Department of Geography, JamiaMilliaIslamia, New Delhi Paper Coordinator, if any Dr. Mahaveer Punia
More informationThe GLOBAL POSITIONING SYSTEM James R. Clynch February 2006
The GLOBAL POSITIONING SYSTEM James R. Clynch February 2006 I. Introduction What is GPS The Global Positioning System, or GPS, is a satellite based navigation system developed by the United States Defense
More informationNR402 GIS Applications in Natural Resources
NR402 GIS Applications in Natural Resources Lesson 5 GPS/GIS integration Global Positioning System (GPS)..a global navigation system that everyone can use What is GPS? How does it work? How accurate is
More informationGPS and Recent Alternatives for Localisation. Dr. Thierry Peynot Australian Centre for Field Robotics The University of Sydney
GPS and Recent Alternatives for Localisation Dr. Thierry Peynot Australian Centre for Field Robotics The University of Sydney Global Positioning System (GPS) All-weather and continuous signal system designed
More informationWhat is GPS? GPS Position Accuracy. GPS Applications. What is a GPS. How does GPS work? GPS Segments
What is GPS? What is a GPS How does GPS work? GPS Segments GPS Position Accuracy GPS Applications 1 What is GPS? The Global Positioning System (GPS) is a precise worldwide radio-navigation system, and
More informationESTIMATION OF IONOSPHERIC DELAY FOR SINGLE AND DUAL FREQUENCY GPS RECEIVERS: A COMPARISON
ESTMATON OF ONOSPHERC DELAY FOR SNGLE AND DUAL FREQUENCY GPS RECEVERS: A COMPARSON K. Durga Rao, Dr. V B S Srilatha ndira Dutt Dept. of ECE, GTAM UNVERSTY Abstract: Global Positioning System is the emerging
More informationTEST YOUR SATELLITE NAVIGATION PERFORMANCE ON YOUR ANDROID DEVICE GLOSSARY
TEST YOUR SATELLITE NAVIGATION PERFORMANCE ON YOUR ANDROID DEVICE GLOSSARY THE GLOSSARY This glossary aims to clarify and explain the acronyms used in GNSS and satellite navigation performance testing
More informationMONITORING SEA LEVEL USING GPS
38 MONITORING SEA LEVEL USING GPS Hasanuddin Z. Abidin* Abstract GPS (Global Positioning System) is a passive, all-weather satellite-based navigation and positioning system, which is designed to provide
More informationIntroduction to the Global Positioning System
GPS for ICS - 2003 Introduction to the Global Positioning System Pre-Work Pre-Work Objectives Describe at least three sources of GPS signal error, and ways to mitigate or reduce those errors. Identify
More informationGNSS Surveying & Processing (A Surveyors Peek Behind the Curtain) Presented by Jeff Clark, PLS
GNSS Surveying & Processing (A Surveyors Peek Behind the Curtain) Presented by Jeff Clark, PLS Global Positioning System (GPS) (GNSS) GPS is considered a passive system Passive in the sense that only the
More informationAn Introduction to GPS
An Introduction to GPS You are here The GPS system: what is GPS Principles of GPS: how does it work Processing of GPS: getting precise results Yellowstone deformation: an example What is GPS? System to
More informationWhat is it? History. Other systems. How does it work? Trilateration GEOG 201 4/28/2010. Instructor: Pesses 1. {06} The Global Positioning System
What is it? {06} The Global Positioning System G.P.S. = Global Positioning System Different from G.I.S. (Geographic Information Systems) Map Interpretation & GPS Spring 2010 M. Pesses History Conceived
More informationGPS Glossary Written by Carl Carter SiRF Technology 2005
GPS Glossary Written by Carl Carter SiRF Technology 2005 This glossary provides supplementary information for students of GPS Fundamentals. While many of the terms can have other definitions from those
More informationGlobal Navigation Satellite Systems II
Global Navigation Satellite Systems II AERO4701 Space Engineering 3 Week 4 Last Week Examined the problem of satellite coverage and constellation design Looked at the GPS satellite constellation Overview
More informationIntroduction to NAVSTAR GPS
Introduction to NAVSTAR GPS Charlie Leonard, 1999 (revised 2001, 2002) The History of GPS Feasibility studies begun in 1960 s. Pentagon appropriates funding in 1973. First satellite launched in 1978. System
More informationENGRG Introduction to GIS
ENGRG 59910 Introduction to GIS Michael Piasecki December 01, 2017 Lecture 12: GPS Systems Lecture 7: Introduction To GPS November 27, 2017 ENGRG 59910 Intro to GIS 2 November 27, 2017 ENGRG 59910 Intro
More informationEffect of Quasi Zenith Satellite (QZS) on GPS Positioning
Effect of Quasi Zenith Satellite (QZS) on GPS ing Tomoji Takasu 1, Takuji Ebinuma 2, and Akio Yasuda 3 Laboratory of Satellite Navigation, Tokyo University of Marine Science and Technology 1 (Tel: +81-5245-7365,
More informationGPS: The Basics. Darrell R. Dean, Jr. Civil and Environmental Engineering West Virginia University. Expected Learning Outcomes for GPS
GPS: The Basics Darrell R. Dean, Jr. Civil and Environmental Engineering West Virginia University Expected Learning Outcomes for GPS Explain the acronym GPS Name 3 important tdt dates in history of GPS
More informationIntroduction to Geographic Information Science. Last Lecture. Today s Outline. Geography 4103 / GNSS/GPS Technology
Geography 4103 / 5103 Introduction to Geographic Information Science GNSS/GPS Technology Last Lecture Geoids Ellipsoid Datum Projection Basics Today s Outline GNSS technology How satellite based navigation
More informationField DGPS Report AT
Field DGPS Report AT-329 2005 Ellen M. Sundlisæter Lene Kristensen Sigrid K. Dahl Ulli Neumann 1 Table of contents Table of contents...2 Introduction...2 Methods...3 Equipment...3 Availability...3 Setup...3
More informationProblem Areas of DGPS
DYNAMIC POSITIONING CONFERENCE October 13 14, 1998 SENSORS Problem Areas of DGPS R. H. Prothero & G. McKenzie Racal NCS Inc. (Houston) Table of Contents 1.0 ABSTRACT... 2 2.0 A TYPICAL DGPS CONFIGURATION...
More informationFundamentals of GPS Navigation
Fundamentals of GPS Navigation Kiril Alexiev 1 /76 2 /76 At the traditional January media briefing in Paris (January 18, 2017), European Space Agency (ESA) General Director Jan Woerner explained the knowns
More informationTDS Survey Pro CE Version Setup RTK Base on known NAD83/WGS84 Point: Mapping Plane Geoid99 Modeling.
TDS Survey Pro CE Version 2.1.8 Setup RTK Base on known NAD83/WGS84 Point: Mapping Plane Geoid99 Modeling. Pre-load known NAD83 State Plane Coordinates and appropriate NGS Geoid 99/96 data files into the
More informationAppendix D Brief GPS Overview
Appendix D Brief GPS Overview Global Positioning System (GPS) Theory What is GPS? The Global Positioning System (GPS) is a satellite-based navigation system, providing position information, accurate to
More informationEffects of Pseudolite Positioning on DOP in LAAS
Positioning, 200,, 8-26 doi:0.4236/pos.200.003 Published Online November 200 (http://www.scirp.org/journal/pos) Quddusa Sultana, Dhiraj Sunehra 2, Vemuri Satya Srinivas, Achanta Dattatreya Sarma R & T
More informationGeodesy, Geographic Datums & Coordinate Systems
Geodesy, Geographic Datums & Coordinate Systems What is the shape of the earth? Why is it relevant for GIS? 1/23/2018 2-1 From Conceptual to Pragmatic Dividing a sphere into a stack of pancakes (latitude)
More informationIntroduction. Global Positioning System. GPS - Intro. Space Segment. GPS - Intro. Space Segment - Contd..
Introduction Global Positioning System Prof. D. Nagesh Kumar Dept. of Civil Engg., IISc, Bangalore 560 012, India URL: http://www.civil.iisc.ernet.in/~nagesh GPS is funded and controlled by U. S. Department
More informationAPPENDIX GPS TERMINOLOGY
APPENDIX GPS TERMINOLOGY Almanac Data transmitted by a GPS satellite which includes orbital information on all the satellites, clock correction, and atmospheric delay parameters. These data are used to
More informationPRINCIPLES AND FUNCTIONING OF GPS/ DGPS /ETS ER A. K. ATABUDHI, ORSAC
PRINCIPLES AND FUNCTIONING OF GPS/ DGPS /ETS ER A. K. ATABUDHI, ORSAC GPS GPS, which stands for Global Positioning System, is the only system today able to show you your exact position on the Earth anytime,
More informationVARIATION OF STATIC-PPP POSITIONING ACCURACY USING GPS-SINGLE FREQUENCY OBSERVATIONS (ASWAN, EGYPT)
ARTIFICIAL SATELLITES, Vol. 52, No. 2 2017 DOI: 10.1515/arsa-2017-0003 VARIATION OF STATIC-PPP POSITIONING ACCURACY USING GPS-SINGLE FREQUENCY OBSERVATIONS (ASWAN, EGYPT) Ashraf Farah Associate professor,
More informationGNSS Signal Structures
GNSS Signal Structures Tom Stansell Stansell Consulting Tom@Stansell.com Bangkok, Thailand 23 January 2018 S t a n s e l l C o n s u l t i n g RL Introduction It s a pleasure to speak with you this morning.
More informationGPS Errors. Figure 1. Four satellites are required to determine a GPS position.
Expl ai ni nggps:thegl obalposi t i oni ngsyst em since a minimum of four satellites is required to calculate a position (Fig 1). However, many newer GPS receivers are equipped to receive up to 12 satellite
More informationIntegration of GPS with a Rubidium Clock and a Barometer for Land Vehicle Navigation
Integration of GPS with a Rubidium Clock and a Barometer for Land Vehicle Navigation Zhaonian Zhang, Department of Geomatics Engineering, The University of Calgary BIOGRAPHY Zhaonian Zhang is a MSc student
More informationAUSPOS GPS Processing Report
AUSPOS GPS Processing Report February 13, 2012 This document is a report of the GPS data processing undertaken by the AUSPOS Online GPS Processing Service (version: AUSPOS 2.02). The AUSPOS Online GPS
More informationGPS for. Land Surveyors. Jan Van Sickle. Fourth Edition. CRC Press. Taylor & Francis Group. Taylor & Francis Croup, an Informa business
GPS for Land Surveyors Fourth Edition Jan Van Sickle CRC Press Taylor & Francis Group Boca Raton London New York CRC Press is an imprint of the Taylor & Francis Croup, an Informa business Contents Preface
More informationE. Calais Purdue University - EAS Department Civil 3273
E. Calais Purdue University - EAS Department Civil 373 ecalais@purdue.edu GPS signal propagation GPS signal (= carrier phase modulated by satellite PRN code) sent by satellite. About 66 msec (0,000 km)
More informationData Acquisition Experiment using NovAtel Dual Frequency GPS Receiver
Data Acquisition Experiment using NovAtel Dual Frequency GPS Receiver Dhiraj Sunehra Jawaharlal Nehru Technological University Hyderabad, Andhra Pradesh, India Abstract The advent of very large scale integration
More informationTable of Contents. Frequently Used Abbreviation... xvii
GPS Satellite Surveying, 2 nd Edition Alfred Leick Department of Surveying Engineering, University of Maine John Wiley & Sons, Inc. 1995 (Navtech order #1028) Table of Contents Preface... xiii Frequently
More informationGPS Tutorial Trimble Home > GPS Tutorial > How GPS works? > Triangulating
http://www.trimble.com/gps/howgps-triangulating.shtml Page 1 of 3 Trimble Worldwide Popula PRODUCTS & SOLUTIONS SUPPORT & TRAINING ABOUT TRIMBLE INVESTORS GPS Tutorial Trimble Home > GPS Tutorial > How
More informationDynamic Positioning TCommittee
RETURN TO DIRETORetr Dynamic Positioning TCommittee PMarine Technology Society DYNAMIC POSITIONING CONFERENCE October 17 18, 2000 ADVANCES IN TECHNOLOGY Removal of GPS Selective Availability - Consequences
More informationGPS Technical Overview N5TWP NOV08. How Can GPS Mislead
GPS Technical Overview How Can GPS Mislead 1 Objectives Components of GPS Satellite Acquisition Process Position Determination How can GPS Mislead 2 Components of GPS Control Segment Series of monitoring
More informationUtilizing A GNSS Network Solution for Utility Applications
Utilizing A GNSS Network Solution for Utility Applications David Newcomer, PE, PLS GPServ, Inc. newcomer@ (407) 601-5816 AGENDA Types and accuracies of data collection o Autonomous o Meter + o Sub-meter
More informationAPPLICATION NOTE Fundamental GNSS
APPLICATION NOTE Fundamental GNSS Receiver Characterisation Spirent Communications PLC Paignton, Devon, TQ4 7QR, England Web: http://www.spirent.com/positioning Tel: +44 1803 546325 Fax: +44 1803 546301
More informationGPS Accuracy Comparison. Tom Biernacki Florida Department of Environmental Protection
GPS Accuracy Comparison Tom Biernacki Florida Department of Environmental Protection What Effects the accuracy of GPS? Atmospheric delay Multipath bounce Weak receiver algorithms Atmospheric Delay Signal
More informationModelling GPS Observables for Time Transfer
Modelling GPS Observables for Time Transfer Marek Ziebart Department of Geomatic Engineering University College London Presentation structure Overview of GPS Time frames in GPS Introduction to GPS observables
More informationBernese GPS Software 4.2
Bernese GPS Software 4.2 Introduction Signal Processing Geodetic Use Details of modules Bernese GPS Software 4.2 Highest Accuracy GPS Surveys Research and Education Big Permanent GPS arrays Commercial
More informationAutomated Quality Control of Global Navigation Satellite System (GNSS) Data
P-315 Automated Quality Control of Global Navigation Satellite System (GNSS) Data S.Senthil Kumar* & Arun Kumar Chauhan, ONGC Summary Global Navigation Satellite System (GNSS), includes GPS, GLONASS and
More informationCHAPTER 2 GEODESY AND DATUMS IN NAVIGATION
CHAPTER 2 GEODESY AND DATUMS IN NAVIGATION GEODESY, THE BASIS OF CARTOGRAPHY 200. Definition Geodesy is the application of mathematics to model the size and shape of the physical earth, enabling us to
More informationDYNAMIC POSITIONING CONFERENCE October 7-8, Sensors II. Redundancy in Dynamic Positioning Systems Based on Satellite Navigation
Return to Session Directory DYNAMIC POSITIONING CONFERENCE October 7-8, 2008 Sensors II Redundancy in Dynamic Positioning Systems Based on Satellite Navigation Ole Ørpen, Tor Egil Melgård, Arne Norum Fugro
More informationANALYSIS OF GPS SATELLITE OBSERVABILITY OVER THE INDIAN SOUTHERN REGION
TJPRC: International Journal of Signal Processing Systems (TJPRC: IJSPS) Vol. 1, Issue 2, Dec 2017, 1-14 TJPRC Pvt. Ltd. ANALYSIS OF GPS SATELLITE OBSERVABILITY OVER THE INDIAN SOUTHERN REGION ANU SREE
More informationNGA s Support for Positioning and Navigation
NGA s Support for Positioning and Navigation PNT Symposium 6 November 2007 Barbara Wiley NATIONAL GEOSPATIAL-INTELLIGENCE AGENCY What is NGA and What Do We Do? National Geospatial-Intelligence Agency (NGA)
More informationCHAPTER 2 GPS GEODESY. Estelar. The science of geodesy is concerned with the earth by quantitatively
CHAPTER 2 GPS GEODESY 2.1. INTRODUCTION The science of geodesy is concerned with the earth by quantitatively describing the coordinates of each point on the surface in a global or local coordinate system.
More informationAn Assessment of Mapping Functions for VTEC Estimation using Measurements of Low Latitude Dual Frequency GPS Receiver
An Assessment of Mapping Functions for VTEC Estimation using Measurements of Low Latitude Dual Frequency GPS Receiver Mrs. K. Durga Rao 1 Asst. Prof. Dr. L.B.College of Engg. for Women, Visakhapatnam,
More informationInvestigation on the Impact of Tropospheric Delay on GPS Height Variation near the Equator
Investigation on the Impact of Tropospheric Delay on GPS Height Variation near the Equator Abstract One of the major problems currently facing satellite-based positioning is the atmospheric refraction
More informationTDS Ranger Survey Pro CE Version RTK Base on known Control Point. RTK Rover - Localization with Control Points.
TDS Ranger Survey Pro CE Version 2.1.8 RTK Base on known Control Point. RTK Rover - Localization with Control Points. Pre-load control Coordinates and appropriate NGS Geoid 99/96 data files into the Ranger
More informationProceedings of Al-Azhar Engineering 7 th International Conference Cairo, April 7-10, 2003.
Proceedings of Al-Azhar Engineering 7 th International Conference Cairo, April 7-10, 2003. MODERNIZATION PLAN OF GPS IN 21 st CENTURY AND ITS IMPACTS ON SURVEYING APPLICATIONS G. M. Dawod Survey Research
More informationThe Impact of Performance Parameters over a DGPS Satellite Navigation System
Australian Journal of Basic and Applied Sciences, 3(4): 4711-4719, 2009 ISSN 1991-8178 The Impact of Performance Parameters over a DGPS Satellite Navigation System 1 Madad Ali Shah, 2 Noor Ahmed Shaikh,
More informationELEMENTS OF THE NATIONAL SPATIAL REFERENCE SYSTEM
Dave Doyle NGS Chief Geodetic Surveyor dave.doyle@noaa.gov 301-713-3178 ELEMENTS OF THE NATIONAL SPATIAL REFERENCE SYSTEM ESRI SURVEY SUMMIT San Diego, CA June 17, 2007 ftp://ftp.ngs.noaa.gov/dist/daved/esri
More informationIntroduction to Datums James R. Clynch February 2006
Introduction to Datums James R. Clynch February 2006 I. What Are Datums in Geodesy and Mapping? A datum is the traditional answer to the practical problem of making an accurate map. If you do not have
More informationLine and polygon features can be created via on-screen digitizing.
This module explains how GPS works, sources of error, and error correction using real time or post processing differential correction. Cost and accuracy of different grades of GPS units are also part of
More informationCARRIER PHASE VS. CODE PHASE
DIFFERENTIAL CORRECTION Code phase processing- GPS measurements based on the pseudo random code (C/A or P) as opposed to the carrier of that code. (1-5 meter accuracy) Carrier phase processing- GPS measurements
More informationKeywords: GPS/GLONASS, Precise Point Positioning, Kinematic, Hydrography
GPS/GLONASS COMBINED PRECISE POINT POSITIOINING FOR HYDROGRAPHY CASE STUDY (ASWAN, EGYPT) Ashraf Farah Associate Professor,College of Engineering, Aswan University, Egypt, ashraf_farah@aswu.edu.eg ABSTRACT
More informationLimits on GNSS Performance at High Latitudes
Limits on GNSS Performance at High Latitudes Peter F. Swaszek, University of Rhode Island Richard J. Hartnett, U.S. Coast Guard Academy Kelly C. Seals, U.S. Coast Guard Academy Joseph D. Siciliano, U.S.
More informationGPS (Introduction) References. Terms
GPS (Introduction) WCOM2, GPS, 1 Terms NAVSTAR GPS ( Navigational Satellite Timing and Ranging - Global Positioning System) is a GNSS (Global Navigation Satellite System), developed by the US-DoD in 197x
More informationSimulation Analysis for Performance Improvements of GNSS-based Positioning in a Road Environment
Simulation Analysis for Performance Improvements of GNSS-based Positioning in a Road Environment Nam-Hyeok Kim, Chi-Ho Park IT Convergence Division DGIST Daegu, S. Korea {nhkim, chpark}@dgist.ac.kr Soon
More informationThe Impact of an Integrated GPS and GLONASS Satellite Geometry in the Precision of Positioning
The Impact of an Integrated GPS and GLONASS Satellite Geometry in the Precision of Positioning Oluropo OLAJUGBA and Chika OKOROCHA, Nigeria Keywords: Integrated, GPS, GLONASS, Geometry, Positioning SUMMARY
More informationData acquisition and integration 3.
University of West Hungary, Faculty of Geoinformatics Bányai László Data acquisition and integration 3. module DAI3 Global Navigation Satellite System SZÉKESFEHÉRVÁR 2010 The right to this intellectual
More informationThe evaluation of the positioning accuracy of the EGNOS and DGPS systems based on the long-term measurements in the years
MARIUSZ SPECHT Department of Geodesy and Oceanography of Gdynia Maritime University mariuszspecht199@gmail.com Polish Cartographical Review Vol. 47, 015, no., pp. 99 108 DOI: 10.1515/pcr-015-0006 The evaluation
More informationMETIS Second Master Training & Seminar. Augmentation Systems Available in Egypt
METIS Second Master Training & Seminar Augmentation Systems Available in Egypt By Eng. Ramadan Salem M. Sc. Surveying and Geodesy Email: ramadan_salem@link.net Page 1 Augmentation Systems Available in
More informationDevelopment of Geoid Based Vertical Datums, A New Zealand Perspective
Technical Seminar Reference Frame in Practice, Development of Geoid Based Vertical Datums, A New Zealand Perspective Matt Amos Manager Positioning and Innovation Land Information New Zealand Sponsors:
More informationAGPS Glossary: from Almanac to Zenith Delay
AGPS Glossary: from Almanac to Zenith Delay Duncan Agnew As with any technically complicated system, GPS has many specialized terms and acronyms associated with it. Since a lot of these come from fields
More informationIntroduction to GNSS
Introduction to GNSS Dimitrios Bolkas, Ph.D. Department of Surveying Engineering, Pennsylvania State University, Wilkes Barre Campus PSLS Surveyor s Conference Hershey, PA Global Navigation Satellite System
More informationAttitude Determination of Small Satellite: The GNSS Paradigm
Attitude Determination of Small Satellite: The GNSS Paradigm Dr. Najam Abbas Naqvi Assistant Professor Department of Aeronautics and Astronautics Institute of Space Technology Islamabad, Pakistan Personal
More informationThe Global Positioning System II Field Experiments
The Global Positioning System II Field Experiments 5-1 Mexico DGPS Field Campaign Cenotes in Tamaulipas, MX, near Aldama 5-2 Are Cenote Water Levels Related? 5-3 DGPS Static Survey of Cenote Water Levels
More informationBeginners Guide to GPS Elevation Plus an Update on GPS Technology
Beginners Guide to GPS Elevation Plus an Update on GPS Technology A TMS Presentation By: Jon Aschenbach Summerlake Enterprises 919 36 th Place Forest Grove, OR 97116 503-707-6236 Coeur d Alene, ID April,
More informationEnhanced Positioning Method using WLAN RSSI Measurements considering Dilution of Precision of AP Configuration
Enhanced Positioning Method using WLAN RSSI Measurements considering Dilution of Precision of AP Configuration Cong Zou, A Sol Kim, Jun Gyu Hwang, Joon Goo Park Graduate School of Electrical Engineering
More information