GEOG 862
GPS and GNSS for Geospatial Professionals

Lesson 10 Overview



The GPS system is one component of the worldwide effort now known as the Global Navigation Satellite System, GNSS. Another component of GNSS is the GLONASS system of the Russian Federation, a third is the GALILEO system administered by the EU and a fourth is the Chinese Beidou system. The concept is the use of these networks of satellites and others together. Further, they will be augmented by both ground-based augmentation systems, GBAS, and space-based augmentation systems, SBAS, to provide positioning, navigation, and timing solutions to users around the world. One goal of this cooperation is interoperability. Interoperability is the idea that properly equipped receivers will be able to obtain useful signals from all available satellites in all the constellations and have their solutions improved rather than impeded by the various configurations of the different satellite broadcasts.


At the successful completion of this lesson, students should be able to:

  • recognize the benefits of L1C;
  • define BPSK modulation scheme;
  • define BOC modulation scheme;
  • explain the difference between BPSK and BOC modulation schemes;
  • define the GLONASS FDMA approach and GLONASS Signals;
  • define the GPS CDMA approach;
  • differentiate between the GLONASS FDMA approach and the GPS CDMA;
  • recognize the use of leap seconds in GLONASS and GLONASS Time;
  • define GALILEO;
  • describe the significance of GIOVE A and GIOVE B;
  • define GALILEO signals;
  • define Beidou/Compass;
  • identify the Quasi-Zenith Satellite System and the Indian Regional Navigation Satellite System (IRNSS) aka NavIC; and
  • recognize the potential of GPS interoperability with GLONASS and GALILEO systems.


If you have any questions now or at any point during this week, please feel free to post them to the Lesson 10 Discussion Forum. (To access the forum, return to Canvas and navigate to the Lesson 10 Discussion Forum in the Lesson 10 module.) While you are there, feel free to post your own responses if you, too, are able to help out a classmate.