Version 2 (modified by mark1, 16 years ago) (diff)


GrafNav GNSS Processing for IPAS Pro

Similar to Applanix GNSS processing. (See that wiki page if these notes dont make sense :))

  1. If required convert the Plane and basestation GPS RINEX files to GPB files. (file>convert>Raw GPS to GPB)
  2. Add Remote file (file>add remote). This is the plane GPB file (probably in the extract firectory)
  3. Add Master file. (file > add master). This is the basestation data.
  4. Load airborne settings (Settings > Load settings from > airborne)
  5. Process differential GNSS.
    1. Change settings/options as required to get a good result (green line). iterate until best solution obtained.
    2. Check combined seperation graph. We want this small.
    3. Check number of satellites. The more the better (Need at least 4 to even get a solution, more for an adequate one)
    4. When happy, click Export -> Export Wizard. Select IPAS from profile. All other default settings should be ok, but check to see if sensible.
  6. Click finish to output the results to a suitable format for IPAS Pro.
  7. Save project and exit.
  8. Analyse the X, Y and Z accuracy of the exported ASCII file (.lat). Acceptable SD results are 3.5cm in XY, 5cm in Z. Excellent SD results are 2cm XY, 3cm Z. These assume basestations within 25km. These figures are from the user manual.