Contents

• Contents (this section)
• Introductory GPS material
• General Information sites related to GPS and navigation
• Non-commercial sites
• Commercial sites
• Related Activities
• General Information about this page

Introductory GPS Material

• A variety of GPS Overviews are available depending upon interest
  • GPS Overview from ELIRIS, Inc.
  • NAVSTAR GPS Joint Project Office Announcements and New Features
  • NAVSTAR GPS Operations
  • Satellite Geodetic Observatory GPS Project, Hungary
  • A GPS Introduction with a different point of view by Don Bartlett.
  • An overview on einet by John Beadles An unfinished draft document.
  • A self teaching program is available from the Quest company.
• GPS Introduction from the University of Texas. A simple but fundamentally correct introduction to GPS. One of GIS World's "Best of the Net" sites for 1996.
• GPS data acquisition, environmental effects (from JPL and CIT).
• Sam Wormley's GPS links (CNDE) at Iowa State University.
• DGPS Coverage worldwide.
• GPS & GLONASS & GEODESY by Alfred Leick has good introductory material for position/survey applications. See the publications for some intersting stuff. Details about GLONASS Double Difference carrier observables.
• Ashtech has the First GPS+GLONASS Surveying System.
• Accuracy at low cost! Priced at only $1995 the MARCH GPS/GIS unit breaks a barrier.
• NovAtel RT-20 Real-time Kinematic DGPS Receiver.
• Peter Bennett's GPS Stuff includes a FAQ.
• FAQ by Alfred Leick has complementary information.
• Geoweb has a GPS discussion area that may be of interest.
• sci.geo.satellite-nav mini-FAQ.
• GPS Receiver Manufacturers, System Integrators, Equipment Suppliers, and Service Providers provided by the Canadian Space Geodesy Forum and the University of New Brunswick.

General GPS related information

• US Coast Guard Navigation Center Includes what used to be called GPSIC (GPS Information Center) and a lot of other stuff.
• CANSPACE The original and most extensive internet reference for GPS. Maintained by the University of New Brunswick in Canada.
• CACS Canadian Active Control System
• GPS Resources page at Iowa State University.
• GPS Precise Orbits from NGS.
• International Earth Rotation Service Source for corrections to the Earth rotation axis parameters xp and yp in bulletins A and B. The national earth orientation service has much of the same information but only current parameters and not a good historial base.
• IGS Central Information
• Inertial Navigation and GPS Homepage at California Partners for Advanced Transit and Highway.
• GPS is sometimes integrated with Inertial Navigation Systems (INS) which use accelerometers and gyros for navigation.
  • Accelerometer basics
• Kalman filters are frequently used with GPS in navigation. Some Kalman filter references are:
  • Kalman filter model description
  • Kalman Filter Outline
  • Introduction to Kalman Filters
  • Kalman filter techniques
  • Kalman filter information
  • Kalman Filter links
• Center for Advanced Aviation System Development (CAASD).
• NASA Reports
  • GPS techniques applied to geodesy and surveying
  • Search for GPS papers
• NASA Space Geodesy Branch, code 926.
• National Earth Orientation Service
• NGS Ephemerides of GPS satellites. These ephemerides are post processed data by the National Geodetic Servey and very accurate. Look in the directory Ngsorbits. The directory Ngsorbits/doc contains explanations, source and pc binary code for interpolating data. Interpolation algorithms are claimed to be better than 1 millimeter. It is a good idea to look directly at each file's beginning to see the included message. Usually it is blank but now and then there is a message that full net data was not available and broadcast ephemerides were used to supplement the data. The FTP sites server is very nice here and will allow one to browse higher directories than first attached. These ephemerides are in ECEF coordinates so corrections for Earth rotation have to be made in order to compute ranges for comparison to pseudo ranges.
• NMEA/GPS interface introduction material.
• NRaD GPS Home Page says: NRaD Global Positioning Division, a prime leader in RDT&E for GPS, has the specialized background and ability to readily and efficiently develop, integrate, and test, and evaluate Government and Commercial GPS user equipment...in a unique facility featuring state-of-the-art technology and an innovative and dynamic test environment.
• A relativistic effects abstract that can be related to GPS can be found at this location. The new AIAA books "Global Positioning System: Theory and Applications (ISBN's 1-56347-106-X and 1-56347-107-8) have an excellent chapter on this subject.
• RENIX pc software. Get the GPSE package (in turbo c).
• Role of the clock in a GPS navigtion receiver.
• Systems of Time
• Tech Net GPS information
• US Coast Guard Navigation Center It includes what used to be called GPSIC (GPS Information Center).
• United States Naval Observatory The source for precise time information needed by GPS analysis. Also the source for Notice Advisories to NAVSTAR Users (NANUs) which gives GPS satellite history and status. Can't seem to find the NANUs so it is best to connect via FTP and go to the GPS directory. The GPS readme file has a directory index. FTP access allows one to access many other services. See the USCG reference below for better access to this stuff.
• USNO NAVSTAR GPS Operations
• USNO general home page.

Non Commercial WWW sites on GPS

• AIUB GPS
• Clock Aided RAIM (Receiver Autonomous Integrity Monitoring) for WAAS. Other RAIM stuff is available here and here.
• CORS the Continuously Operating Reference Station (CORS) network. Go to directory CORS.
• Access to and manipulation of NGS CORS data
• DUT/SSRandT GPS Page
• Center for Advanced Avionics System Development (CAASD) has some GPS reports.
• Deformation research using GPS
• GPS in Geosciences
• GPS Guidance Package from the Tactical Technology Office (ARPA).
• German GPS Information and Observation System.
• GPS Ice Motion Images
• IGSG The JPL site for International GPS service for Geodynamics. Many interesting directories. An excellent site for obtaining accurate GPS satellite ephemrides when the NGS data is not available.
• Integrated use of GPS and GLONASS
• Limited GPS references.
• M. Burc Oral's GPS Home Page Used to be maintained at MIT, I believe. Look in the GPS Data Analysis Software for interesting information.
• NAWCWPNS GPS Resource page Has some nice stuff including a mirror of the Holloman AFB GPS data (includes almanac data) and a GPS satellite predictor.
• NGS "Treasure Chest" includes GPS references and coordinate frame references. Also has GPS satellite ephemerides.
• NGS PC products for GPS conversions and map coordinates.
• NOAA Advanced technology branch - GPS activities. Lots of references to similar GPS activities here.
• On Board Navigation System Development from FDD-NASA.
• PANS: A Portable Navigation Platform.
• Stanford GPS Laboratory Under construction.
• GPS work at UCLA
• Univ of Miami GPS Volcano Monitoring
• General UCSD site information.
• TOPEX/Poseidon GPS data processing facility Precision Orbit Determination using GPS
• TOPS Ultra Precision GPS Navigation System
• US Army Base Station Sites
• UNAVCO home page or UNAVCO FTP reference sites.
• USCG R/D Center (experimental) Includes Differential GPS (DGPS) reaearch. The GPS Information Center (GPSIC - the official civilian source for GPS information) is now on line through the USCG NAVCEN. An alternate method is to connect to the FEDWORLD gateway. After reaching the MAIN menu, use the hot command /go gateway (a hidden choice). Then select database 54 (i.e., type D54) to connect to the USCG site that has GPSIC data.
• Worcester Polytechnic Institute Satellite Navigation Laboratory
• Another GPS and geoscience site from Canada.

Commercial WWW GPS sites

A list of companys related to GPS.

1. GPS Receiver manufacturers
2. Accqpoint Differential GPS services.
3. All Outdoor Trading Company GPS page.
4. Andrew Gyros and navigation
5. Ashtech
6. AVCAN
7. Canadian Marconi Company
8. CANSEL
9. CSE differential GPS hardware and software.
10. Del Norte
11. DCI DGPS stuff.
12. Don Downey's Magellan Page
13. Eagle
14. Geoline
15. GEOsurv, Inc.
16. GPS for FUN
17. GPS Software
18. Honkus and Associates
19. Imagine GPS on line catalog
20. Lambdatech GPS sales and support.
21. Mercat
22. Navcomp GPS software.
23. NAVTRAK
24. OMNISTAR
25. Rentec USA
26. Rockwell NAVCORE GPS Receivers
27. Trimble
28. GPS WORLD home page
29. GPS WORLD Content and subscription information if the GPS WORLD home page is not available.
30. Intermetrics GPS work (the company I work for)
31. GPS comparison chart from the all outdoor trading company.
32. NAVTECH GPS store
33. SAIC GPS Homepage. Has some introductory material.
34. StarLink DGPS Information
35. TeleType GPS
36. TOPCON
37. II Morrow
38. Virtual Landscape Technologies

Related Activities

• American Geophysical Union has a useful index
• American Institute of Aeronautics and Astronautics (AIAA)
• Clocks and Time
• GLONASS (the Russian GPS) has a home page at MIT. Also includes some GPS plots. Also includes some MIT reports.
• GLONASS information center.
• INMARSAT Home Page
• Institute of Navigation (ION)
• SCAA CARD project (GNSS transponder).
• Time software. GPS is not just an accurate position sensor but is also a very accurate clock. While not directly applicable to GPS the links at this site have a lot of information with respect to time. The site also has a list of reference clocks some of which are GPS based.
• Laser Rangefinder (Commercial)
• VLBI more accurate but less flexible than GPS. Basis for some of the parameters used in GPS navigation models. See also VLBI data acquisition, environmental effects .

General Information about this page

The above lists are to generic GPS and related useful information.

To the master list.