I tried to do a test of sending three RINEX files to CSRS-PPP:
1) carrier phase + pseudorange
2) pseudorange only
3) carrier phase only

Oddly, file 3 was rejected as not having any usable observation data.  Files 1 
and 2 produced identical output.   It looks like CSRS-PPP does not process 
carrier phase measurements for L1 only receivers!   I had previously determined 
that they do not use doppler or signal strength measurements.

BTW, this was a 24 hour file from an M8T tracking GPS and GLONASS with 5 second 
intervals.  The lat/lon/alt error ellipses were:  182/166/441 mm.  So the 
Acutime GG is not as bad as I originally thought...
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