Changes between Version 27 and Version 28 of Processing/Applanix


Ignore:
Timestamp:
Feb 15, 2008 11:31:01 AM (11 years ago)
Author:
mggr
Comment:

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  • Processing/Applanix

    v27 v28  
    7373
    7474---------------
     75== Basestation handling ==
    7576
    76 == UK Rinex base stations ==
     77=== Automatic basestations ===
     78
     79
     80Free basestation data (from Nico@Applanix):
     81{{{
     82Coming to one data set: You may know that you can download base
     83station data from the IGS service. These stations are free of charge
     84and you can download them from inside of POSGNSS.
     85
     86You should try to download free base stations from POSGNSS. The tool
     87can be found under >>Tools/Download service data<<.
     88
     89Go to tab >>add closest<< and enter coordinates of interest and hit
     90>>find stations<<. Select the stations that are close enough.
     91
     92Got to >>download<< tab and define the path, date, start time, length
     93of flight and interpolate to 1 second data. Then click download.
     94}}}
     95
     96=== International base stations ===
     97
     98Mostly the same as for UK - just make sure the position is correct and in the correct datum (may need transformation or conversion).
     99
     100=== UK Rinex base stations ===
    77101
    78102For 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!
     
    108132
    109133
     134-------------------------
    110135
    111136== PPP Processing (when no base station data is available) ==
     
    122147
    123148 * Follow standard processing method from exporting to !PosProc.
     149
     150Note from Nico on practicalities of PPP:
     151{{{
     152PPP might not be a good solution here. This method requires a long time of data
     153logging before the flight mission and afterwards. If I say long, I mean around
     15430 minutes.
     155
     156This time is required before the algorithm can converge yielding a solution. So,
     157whenever you plan to use PPP in the future please make sure you log enough data
     158before you take off and after landing.
     159}}}
    124160-------------
    125161== Processing tips ==