RRLP / ephemeris data

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Dieter Spaar spaar at mirider.augusta.de
Wed Dec 23 14:45:27 UTC 2009


Hello Sylvain,

I finally found the time to play with the RRLP encoding of
the GPS assistance data, sorry for the long delay.

When comparing the encoded PDUs with the data from an evaluation
version of a commercial ASN1 too, I found several problems which seem
to come from a bug in the ASN1 unaligned PER encoder of ASN1C. I can
also confirm this problem by simply trying to decode the generated PDUs
with the ASN1 decoder from ASN1C, it shows the same error as the
commercial tool.

I think I have found the bug and a fix for it, however I have not
yet confirmed that it really works with a phone, I currently just check
the PDUs. I will try to test it with a phone, if anyone is currently
playing with RRLP, I can of course send the bug fix (I am just not yet
100% sure with it).

Just in case, I use ASN1C from the SourceForge subversion repository.

Best regards,
  Dieter
-- 
Dieter Spaar, Germany                           spaar at mirider.augusta.de




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