GPS (and GLONASS) Satellite Tracking

                  Books & Pubs   |   News   |   GPS   |   DGPS   |   Status   |   Accuracy   |   GIS   |   Waypoints   |   Maps   |   Navigation  

Interactive GPS Satellite Positions
Interactive GPS Satellite Prediction

GPS Hackery

NORAD Two-Line Element Sets - NORAD two-line element set consists of two 69-character lines of data which can be used together with NORAD's SGP4/SDP4 orbital model to determine the position and velocity of the associated satellite. The only valid characters in a two-line element set are the numbers 0-9, the capital letters A-Z, the period, the space, and the plus and minus signs—no other characters are valid.

IGS Product Availability - Three types of GPS ephemeris, clock and earth orientation solutions are computed. The rapid and final combinations are available with 2-day and 2-week latencies, respectively. The predicted orbit is available at about 23:00 UT.

GPS Precise Orbits - The U.S. Department of Transportation's Civil GPS Service has designated NOAA to be the federal agency responsible for providing accurate and timely Global Positioning System (GPS) satellite ephemerides ("orbits") to the general public. The GPS precise orbits are derived using 24 hour data segments from the global GPS network coordinated by the International Geodynamics GPS Service (IGS). the reference frame used in the computation is the International Earth Rotation Service Terrestrial Reference Frame (ITRF). In addition, an informational summary file is provided to document the computation and to convey relevant information about the observed satellites, such as maneuvers or maintenance. The orbits generally are available two to six days after the date of observation.

IERS Rapid Service/Prediction Center is the product center of the International Earth Rotation and Reference Systems Service responsible for providing Earth orientation parameters (EOPs) on a rapid turnaround basis. This service is primarily intended for real-time users and others needing the highest quality EOP information sooner than is available in the IERS final series (Bulletin B) published by the IERS Earth Orientation Center, which is based at the Observatoire de Paris. USNO EO Dept

This Center is an activity of the Earth Orientation (EO) Department at the U.S. Naval Observatory (USNO). The mission of the USNO includes determining the positions and motions of celestial bodies, measuring the Earth's rotation and orientation, maintaining the master clock for the U.S., and disseminating precise time (atomic and astronomical).

NGS - Precise GPS Orbits Computed at the National Geodetic Survey GPS - International GPS Service (IGS) Data - As part of this effort, the International GPS Service (IGS), along with a multinational membership of organizations and agencies, provides GPS orbits, tracking data, and other high-quality GPS data and data products on line in near real time to meet the objectives of a wide range of scientific and engineering applications and studies.

Orbit Determination and Satellite Navigation - The Global Positioning System is remarkably precise in determining a user's location. But before these satellites can help anyone else, they first need to know their own positions and movements. Orbit determination is the branch of space science that makes such knowledge possible.  

TLE Documentation  

Satellite Tracking Software Index
    NORAD Two-Line Element Sets Current Data   Brief Introduction To TLEs And Satellite IDs
    GPS Operational
    Glonass Operational

GPS - Data & Information (USNO)

    GPS Almanacs Information
    GPS Almanac Files
    YUMA Almanacs

Satellite Tracking Lyngemark Satellite Tracker: Atlantic Ocean - Data relating to geosynchronous satellite positons and information.
    WAAS - PRN 122 - Inmarsat 3F4 (AOR-W)
    WAAS - PRN 134 - Inmarsat 3F3 (POR)

SPACEWARN Bulletin is intended to serve as an international communication mechanism for the rapid distribution of information on satellites and space probes. The Bulletin is issued at the first of each month and provides a listing of launches and brief details of each launch from the preceding month. Also included are the status of some specialized fleets (such as GLONASS and GPS) or links to other sites that provide current status.

Keplerian Elements Tutorial Keplerian Elements Formats

J-Track 3D



Copyright 2015 - Samuel J. Wormley