Changes between Version 27 and Version 28 of Processing/Applanix

Timestamp:

Feb 15, 2008, 11:31:01 AM (17 years ago)

Author:

mggr

Comment:

--

Processing/Applanix

@@ -73 +73 @@
 
 ---------------
+== Basestation handling ==
 
-== UK Rinex base stations ==
+=== Automatic basestations ===
+
+
+Free basestation data (from Nico@Applanix): 
+{{{
+Coming to one data set: You may know that you can download base
+station data from the IGS service. These stations are free of charge
+and you can download them from inside of POSGNSS.
+
+You should try to download free base stations from POSGNSS. The tool
+can be found under >>Tools/Download service data<<.
+
+Go to tab >>add closest<< and enter coordinates of interest and hit
+>>find stations<<. Select the stations that are close enough.
+
+Got to >>download<< tab and define the path, date, start time, length
+of flight and interpolate to 1 second data. Then click download.
+}}}
+
+=== International base stations ===
+
+Mostly the same as for UK - just make sure the position is correct and in the correct datum (may need transformation or conversion).
+
+=== UK Rinex base stations ===
 
 For the UK Rinex stations, the position is provided as Earth-centered Cartesian coordinates (XYZ) in the ETRS89 datum (directly compatible with WGS-84, just more exacting).  As they're compatible, these coordinates just need to be converted to WGS-84 lat/longs for POSGPS.  If we were coming from or going to a different datum/coordinate system (e.g. OS National Grid), we would need to do a coordinate transformation rather than conversion - this is complicated!
@@ -108 +132 @@
 
 
+-------------------------
 
 == PPP Processing (when no base station data is available) ==
@@ -122 +147 @@
 
  * Follow standard processing method from exporting to !PosProc.
+
+Note from Nico on practicalities of PPP:
+{{{
+PPP might not be a good solution here. This method requires a long time of data
+logging before the flight mission and afterwards. If I say long, I mean around
+30 minutes.
+
+This time is required before the algorithm can converge yielding a solution. So,
+whenever you plan to use PPP in the future please make sure you log enough data
+before you take off and after landing.
+}}}
 -------------
 == Processing tips ==