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Upate URL to Ephemeris data

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The US government has discontinued the anonymous ftp server.
Update readme file with the new URL.
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Dale May 2020-12-05 21:47:48 -06:00
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README.md
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@ -43,9 +43,9 @@ The user is also able to assign a static location directly through the command l
The user specifies the GPS satellite constellation through a GPS broadcast The user specifies the GPS satellite constellation through a GPS broadcast
ephemeris file. The daily GPS broadcast ephemeris file (brdc) is a merge of the ephemeris file. The daily GPS broadcast ephemeris file (brdc) is a merge of the
individual site navigation files into one. The archive for the daily file is: individual site navigation files into one. The archive for the daily file can
be downloaded from: https://cddis.nasa.gov/archive/gnss/data/daily/. Access
[ftp://cddis.gsfc.nasa.gov/gnss/data/daily/](ftp://cddis.gsfc.nasa.gov/gnss/data/daily/) to this site requires registration, which is free.
These files are then used to generate the simulated pseudorange and These files are then used to generate the simulated pseudorange and
Doppler for the GPS satellites in view. This simulated range data is Doppler for the GPS satellites in view. This simulated range data is