[FOSS-GPS] Question about GLONASS system in RTKLIB

[Dimitris Psychas]

Hello to everyone,

I am struggling, the last days, to understand if the inclusion of GLONASS system in RTKLIB is done correctly. I use MGEX observation (*.yyo) and navigation data (specifically combined, *.yyp), as well as MGEX precise orbit and clock products (*.sp3 and *.clk) in order to estimate the position of some MGEX stations. First, I use only the GPS system and get a solution, named A (GPS-only solution). Then, I include the GLONASS system in the data processing (by ticking it in Options/Setting1) and get a solution, named B (GPS + GLO solution). 

My options in the data processing are:
Options / Setting1 : Positioning mode: PPP static, Filter type: Forward, Ionosphere correction: Iono-free LC, Troposphere Correction: Estimate ZTD, Satellite Ephemeris/Clock: Precise, all the corrections applied (i.e. Sat PCV, Rec PCV, etc.)

I have done the same processing for many stations, and my solutions A and B are always the same, there is not even a small improvement in the convergence period. But the weird thing is that when I am trying to see the number of visible satellites, it is always the same. My 24-hour observation data files contain a lot of GLONASS satellites, so an increase in the total number of satellites should exist, right ? Does anyone know if I am doing something wrong, or whether a bug exists in the software ?


Thank you in advance,
Dimitrios V. Psychas
psxdimitris at hotmail.com 		 	   		  
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