Webinar instructions will be emailed before the date of the webinar.

Please log into the webinar 15 – 30 minutes before start time.

Tuesday, July 26, 2022 
8:30 am – 3:20 pm CDT


Presented by
Dr. Thomas H. Meyer Ph.D.

Introduction and History
History of satellite-based navigation/positioning
Terms and nomenclature
• GNSS, GPS, space vehicle (SV),
GNSS system architecture (segments)
• Control segment, monitor stations, master control station
Principles of system operation
Current status of GNSS
• Number of SVs and operational status, benefits and drawbacks

GNSS Positioning Orbits and Ranging
Ranging overview
• Trilateration
Positioning equations
• Range equation 2-D, Range equation 3-D, 3-D Trilateration
• Determining position of SV’s, ephemeris, satellite laser ranging (SLR)
• Kepler’s Laws of Planetary Motion, elapsed time = range
• Time bias
Code-based ranging
Carrier phase-based ranging

Timing Codes and Carrier Phase
Waves and GPS: signal structure
• Terminology: frequency, channel, band, five frequencies: L1-L5, L1c and L2c
• L-Band, GPS Bands
Timing codes
• C/A-Code and P-Code, code phase, timing code chips = clock ticks, psuedorange
Ranging by carrier phase
Integer ambiguity

Geodesy and GNSS
Control coordinates from CORS
Terminology: phase center, phase center offset
Antenna calibration
Position and velocity
• Antenna reference point
NAD27, NAD83, WGS84
Tectonic plate motion

GNSS Accuracy and Precision
Precise point positioning (PPP)
Differential GPS (DGPS)
Phase differencing
Static vs. kinematic
Continuously operating reference station (CORS)
Real-time positioning
Real-time Kinematic (RTK)
Advanced continuously operating reference network (ACORN)
Practical considerations


 Webinar Instructions

Each webinar session earns continuing education credit and can be registered for individually. 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.

Webinars are presented via GoToWebinar, an easy-to-use application that can be run on most systems and tablets. Instructions and login information will be provided in an email sent close to the date of the webinar. It is highly recommended that you download, install and test the application before the webinar begins by clicking on the link in the email.

GoToWebinar App requirements:
Windows 7 – 10 or Mac OSX Mavericks (10.9) – macOS Catalina (10.15)

Web Browser:
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Google Chrome, Mozilla Firefox, Apple Safari, Microsoft Edge
Internet Explorer v11 (or later) with Flash enabled

Internet connection: Minimum of 1Mbps       Hardware: 2GB RAM or more

For more information, visit the Support section at


Professional Engineers:
6.0 PDHs

Land Surveyors:
6.0 PDHs (in Most States)


Continuing Education Credit Information
GNSS Positioning
This webinar is open to the public and offers 6.0 PDHs/continuing education hours to engineers licensed in most states, and 6.0 PDHs to land surveyors licensed in most states.

This educational activity has been evaluated and accredited by The Practicing Institute of Engineering for 6.0 PDHs. It is deemed approved for New York engineers and land surveyors via this accreditation (Regulations of the Commissioner §68.14(i)(2)).

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. CE10600325), Maryland and North Carolina (S-0130).

The Florida Department of Agriculture and Consumer Services has assigned this course number 10185 for surveyors.

The Tennessee Board of Examiners for Land Surveyors has approved this course for 6.0 PDHs.

This course has been submitted to the Missouri Board for Architects, Professional Engineers, Professional Land Surveyors and Professional Landscape Architects for 6.0 PDUs; approval is currently pending.

HalfMoon Education is not seeking course approval for New Jersey or Delaware land surveyors.

Visit this course listing at for updates on pending credits. Completion certificates will be awarded to participants who complete this event and earn a passing score (80%) on the quiz that follows the presentation (multiple attempts allowed).


Dr. Thomas H. Meyer Ph.D.

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.