Hello, On Tue, 17 Feb 2009 13:07:54 +0100 Rikard Nilsson <janrik...@gmail.com> wrote:
> would it be possible to get the satelite information that we get from > u-blox from somewhere else? > somewhere that dont require user account? there are three possibilities that I see here: 1) mirror the data from u-blox somewhere 2) See whether we can use the information from http://www.ngs.noaa.gov/orbits/ to provide our own aiding data 3) Set up a stationary GPS receiver and use aiding data from there 1: Someone said that u-blox explicitly allows redistribution of their AGPS online data. This would be great since we already have all the data in UBX format. 2: Calculating almanac/ephemeris data from the files present in ftp://igs.ensg.ign.fr/pub/igs/products/ should be possible, but is far less straight forward than variant 1. Additionally to studying ICD-GPS-200 (http://www.navcen.uscg.gov/PUBS/gps/icd200/icd200cw1234.pdf) one would need to parse the sp3c format: ftp://igscb.jpl.nasa.gov/pub/data/format/sp3c.txt 3: This would be a pretty simple and good way of setting up our own aiding server if 1 doesn't work out. The problem with this approach is that we only get ephemeris for SVs in our view so if I set up one station in Germany it wont help at all in the US. This could be worked around by having many such stations all over the world. Now that hot-/warmstart with ephemeris playback works with the framework we should try to get an open server with aiding data available ASAP. Regards, Daniel Willmann
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