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<body class='hmmessage'><div dir='ltr'>No. In particular, when I use multiple GNSS systems, I get much better performance compared to GPS-only PPP, using dual frequency observation data. <br><br>I thought the same, that the L2 observations from iono products are not produced correctly. But how could I fix it ? Do you have tried something like this ? I just used RTKCONV to remove the L2 frequency observations, and then I use IONEX TEC files as Ionosphere Correction in RTKPOST in order to establish the single-frequency PPP. <br><br><div><hr id="stopSpelling">From: fgnievinski@gmail.com<br>Date: Sun, 24 May 2015 17:19:05 -0300<br>To: foss-gps@lists.osgeo.org<br>Subject: Re: [FOSS-GPS] Single-Frequency PPP in RTKLIB<br><br><div dir="ltr">Do you get similar worse performance for GNSS compared to GPS when you process your original RINEX file containing dual-frequency measurements?<div>If not, then there's something wrong in the way you're producing synthetic L2 observations from iono products.</div><div>-F.</div></div>
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