Download gps ephemeris data

Get Our News. Media Contacts. I'm a Reporter. Staff Profiles. Social Media. Contact Us. About Us. Survey Manual. Key Officials. Careers and Employees. Doing Business. Emergency Management. Definitive Ephemeris files are available two days after acquisition, and can be accessed by choosing one of the options below: Option 1 - Search a single date Option 2 - Search for multiple dates up to 10 Option 3 - Search within a data range.

The Horizons service normally provides the latest orbit and most accurate ephemerides for any given object. For some purposes, orbital elements may be sufficient. Such data are available via the plantary satellite mean elements tables and the small-body element tables.

If binary ephemeris files are needed for use by software designed to read them , precomputed SPK files for the planets and natural satellites are available for download, and can be created on demand for individual asteroids and comets via Horizons.

Toggle navigation Home. About What does SSD do? MollyCat MollyCat 1 1 gold badge 5 5 silver badges 14 14 bronze badges. Add a comment. Active Oldest Votes. You are confusing two different methods to obtain the almanac necessary for GPS to compute user locations: Receive and decode the almanac directly from the GPS satellite signal, which is broadcast in its navigation message. First you must distinguish between almanach epheremides preditced ephermides model The almanach contains the rough satellite curves, valid for "long" time.

The epheremides contains the detailed satellite orbit modell. They are valid a short time. AlexWien AlexWien There is so much wrong information in this answer. The almanac data repeats every Ephemeris data degrades in accuracy after about 3 hours.

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