<div dir="ltr"><div><div><div><div><div><br></div>This image shows the problem:<br><a href="http://imagebin.org/283130">http://imagebin.org/283130</a><br><br></div><div>I am interested in the clock offset of my GPS receiver.<br>
</div>The two web-based PPP services produce approximately identical solutions. They are spaced by an offset of ca. 3ns, but the shape of the curves are very similar.<br></div><div>The CSRS-PPP solution lists the clock offset in a separate CLK(ns) column.<br>
</div><div>The JPL-APPS solution has a Clock(m) colum that I have converted to nanoseconds (multiply with 1e9/3e8)<br></div><div><br></div>From RTKPOST I output the time-stamps to the .pos file with 12 decimals, and from that calculate the clock offset.<br>
</div>This is the blue data in the figure which is obviously much more noisy and probably not the correct PPP solution.<br>What am I missing? Should I apply some correction to the .pos file time-stamps? how?<br><br>Anders<br>
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<div><div><div><div><br></div>I am trying to compare my solution against web-pased PPP services at CSRS and JPL:<br>
<a href="http://webapp.geod.nrcan.gc.ca/geod/tools-outils/ppp.php" target="_blank">http://webapp.geod.nrcan.gc.ca/geod/tools-outils/ppp.php</a><br></div>and<br><a href="http://apps.gdgps.net/apps_file_upload.php" target="_blank">http://apps.gdgps.net/apps_file_upload.php</a><br>
<br></div>these web-based PPP calculations give similar results, but I am not able to reproduce the data with RTKLib.<br></div>For example the clock error plots are much smoother with CSRS-PPP and APPS, while the RTKLib output is very noisy.<br>
<div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div class="gmail_extra">Does anyone know how to reproduce the results of these web-based services with RTKLib?<br>
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