Earth Sciences: Geomatics: Global Positioning System

Global Positioning System satellite ephemerides ("orbits") information for the general public, from US NOAA. GPS precise orbits are derived using 24 hour data segments from the global GPS network. An informational summary file is provided to document the computation and to convey relevant information about the observed satellites, such as maneuvers or maintenance. Orbits generally are available 2 to 6 days after the observation.

SNAP is Australia's largest academic GPS research group specialising in high precision GPS technology and applications.

GPS Ground Station on Kwajalein Island, photographs of the island and site. Links to others GPS sites.

GPS Base Stations located in New Zealand, Australia, and New Guinea. Download GPS data files for $40-$70 per day.

GPS receiver comparisons.

Dual frequency GPS & GLONASS, as well as EGNOS, WAAS and MSAT based on an in-house single baseband processor.

Navigation-Wonder, a shareware GPS mapping navigation software including voice response system [Windows].

A free membership society to bring together the delegates, sponsors, and exhibitors for the Satellite Navigation Conference and to foster, develop, and assist the Global Positioning System disciplines.

C-language software package for GPS-based real-time positioning and orbit determination. Includes system overview, technical papers, and a live demo .

Downloadable free GPS maps for travel adventures, self-guided tours, and outdoor activities. Map data includes waypoints and routes for use with handheld GPS and car navigation systems.

An algorithm for obtaining an exact solution for the three dimensional location of a mobile given the locations of four fixed stations (like a GPS satellite or a base station in a cell) and the signal time of arrival (TOA) from the mobile to each station. From Ralph Bucher.

Objective is the development of a system for rapid and inexpensive monitoring of unstable slopes, such as pit walls, earth\rock slopes and dam walls using global satellite positioning technology.

Global Positioning System Accuracy

The history and story of how the Global Positioning System evolved from the development of the world's most accurate timepieces, atomic clocks, by physicists looking into the nature of time. Adapted from an article written by MIT scientist Daniel Kleppner.

Global positioning system overview and bibliography.

Specializes in ArcView GIS training and provides commodities, services and training for implementing and integrating solutions with GIS, GPS, AVL, internet mapping and satellite imagery.