GNSS Positioning
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Agenda
Webinar instructions will be emailed before the date of the webinar.
Please log into the webinar 15 – 30 minutes before start time.
Thursday, December 16, 2021
9:00 am – 4:30 pm CST (incl. a 60-min break)
Presented by:
Dr. Thomas H. Meyer
Agenda
Observation Modes
Absolute positioning
• Autonomous
• Precise point positioning (PPP)
• Differential GPS (DGPS)
Relative positioning
• Phase differencing
Kinematic
Static
• CORS
•Atop a tripod
• Static post-processing and OPUS
Real-time
• Real-time kinematic
• Real-time network
Independence of Observations: How Long Should We Wait?
What is independence? What is correlation? Bias?
Occupation duration
Examples of occupation duration with various epoch rates
Discussion of the constellation
• Orbital planes, slots, overview of SVs, 12-hr orbital period
Heighting example
Error Budget
Range-pole centering error
Multipath
Geometry
• Dilutions of precision
Environment
• Ionosphere → multi-frequency receivers
• Troposphere
• Signal-to-noise ratio
Ephemeris
• Positioning discussion: trilateration
• Control → orbits
• Predicted (broadcast) vs. modeled (precise)
• Comparison of ephemeris accuracies
– Ranging
• Overview of how ranging works
• C/A code, P code
• Phase observable
To the Future
Reference frames, geodesy
• NAD 83 non-geocentricity, WGS 84, ITRF
• NATRF 2022
• Time-dependent positioning, Stable North American Ref. Frame (SNARF)
GPS modernization
• L1C, L2C, L5
• New navigation message
Webinar Instructions
All attendees must log-on through their own email – attendees may not watch together if they wish to earn continuing education credit. HalfMoon Education Inc. must be able to prove attendance if either the attendee or HalfMoon Education Inc. is audited.
Certificates of completion can be downloaded in PDF form upon passing a short quiz. A link to the quiz will be sent to each qualifying attendee immediately after the webinar. The certificate can be downloaded from the Results page of the quiz upon scoring 80% or higher.
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Credits
Professional Engineers:
6.0 PDHs (NY – No Credit Offered)
Land Surveyors
6.0 HSW CE Hours
(NY, NJ, RI – No Credit Offered)
Continuing Education Credit Information
GNSS Positioning
This webinar is open to the public and offers 6.0 PDHs to professional engineers and land surveyors in most states. HalfMoon Education is not seeking approval for land surveyors in New Jersey or Rhode Island. This course is not approved for continuing education credit for engineers or land surveyors in New York.
HalfMoon Education is an approved continuing education sponsor for engineers in Florida (Provider No. 0004647), Indiana (License No. CE21700059), Maryland, New Jersey (Approval No. 24GP00000700) and North Carolina (S-0130).
HalfMoon Education is an approved continuing education sponsor for land surveyors licensed in Indiana (License No. CE21700059), Maryland and North Carolina (S-0130). The Tennessee Board OF Examiners for Land Surveyors has approved this course.
Speakers
Dr. Thomas H. Meyer, Ph.D.
Professor of Geodesy in the Department of Natural Resources and the Environment at the University of Connecticut
Tom Meyer was awarded a Ph.D. from Texas A&M University in College Station, Texas in 1998, where he was a research associate in the Mapping Sciences Laboratory. He now is a Professor of Geodesy in the Department of Natural Resources and the Environment at the University of Connecticut, where he teaches courses in geomatics, GNSS and plane surveying, geodesy, and geospatial analysis in Python. Dr. Meyer is a member of ASCE and the Connecticut Association of Land Surveyors. He is also a past president of the New England Section of the ACSM and a Fellow and the 2016/2019 president of the American Association for Geodetic Surveying. Dr. Meyer has published an undergraduate textbook on geodesy, numerous peer-reviewed journal articles, and is on the editorial boards of the Journal of Surveying Engineering (JSE) and Surveying and Land Information Science (SaLIS). He is a regular presenter at national meetings, giving workshops and seminars on numerous topics in geodesy, GNSS, and surveying. His most recent research projects include new formulations of low-distortion projections, and developing spatial statistical animal-movement models for mountain lions, bobcats, and salmon.