== References ==* Snoj, Marko (2006).
* U.S. Army Corps of Engineers manual: NAVSTAR HTML and PDF (22.6 MB, 328 pages)* National Geodetic Survey Orbits for the Global Positioning System satellites in the Global Navigation Satellite System* GPS SPS Performance Standard—The official Standard Positioning Service specification* GPS PPS Performance Standard—The official Precise Positioning Service specification* GPS and GLONASS Simulation (Java applet) Simulation and graphical depiction of space vehicle motion including computation of dilution of precision (DOP)