[time-nuts] SVN-32

[Mike S]

At 05:04 PM 3/7/2008, Bruce Lanning wrote...
>Those interested in the subject satellite should check the below 
>page...
>
>http://groups.google.com/group/alt.satellite.gps/browse_thread/thread/d9ecefc77d23328e/fe7f019259416b60

That article was already cited here, and has a lot of inaccuracies.

1) SVN32/PRN32 was previously operational, and healthy, from 11 
December 1992 until 28 January 1993, when its PRN was changed to 1.

2) GPS has "always," and only, been defined for PRN numbers 1-32. There 
has never been a PRN 0. (see Table 3-I in 
http://www.navcen.uscg.gov/pubs/gps/icd200/ICD200Cw1234.pdf )

Apparently, some early military GPS receiver(s?) had software which 
incorrectly used zero based indexing for PRNs (i.e. 0-31 instead of 
1-32), and so had problems with PRN32. That's why SVN32 was changed 
from PRN32 to PRN1 after being on for only a few weeks.