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Posted by Johnson on May 9, 2009, 4:15 pm


I need some decoded almanac parameters for my research. I have
downloaded the almanac file from Trimble Data Source for Almanac.
However, I couldn't find a description for the Trimble Almanac Data File
Format. After comparing the almanac with known ephemeris data, I found
they don't actually match for every parameter. For example, the OMEGADOT
values.

Does anybody know if there is a description for the Trimble Almanac Data
File Format?

Does anybody know where I can download some almanac data with known format?

Thanks!

Posted by Johnson on May 9, 2009, 6:55 pm


Johnson wrote:
> I need some decoded almanac parameters for my research. I have
> downloaded the almanac file from Trimble Data Source for Almanac.
> However, I couldn't find a description for the Trimble Almanac Data File
> Format. After comparing the almanac with known ephemeris data, I found
> they don't actually match for every parameter. For example, the OMEGADOT
> values.
>
> Does anybody know if there is a description for the Trimble Almanac Data
> File Format?
>
> Does anybody know where I can download some almanac data with known format?
>
> Thanks!
Got it.
http://www.navcen.uscg.gov/GPS/almanacs.htm