Static Solution Types
GrafNet automatically forms sessions between any GPB files that have a minimum amount of overlapping data. The default value is 180 seconds, but this can be edited from the Import Options button when adding observations to a project. There are three modes of static processing, including:
Fixed Solution (ARTK)
In this mode of processing, integer ambiguity resolution is attempted using ARTK.
When choosing this mode, GrafNet will attempt to fix integer ambiguities regardless of the baseline distance separation. This will overwrite the Automatic setting, which chooses between fixed and float solution using the baseline distance and the tolerances set within the ARTK tab.
The settings within the Advanced tab control whether ionospheric processing is engaged when attempting a fixed integer solution and whether the tropospheric error state is engaged.
GrafNet attempts to fix new ambiguities whenever there is a change in satellite geometry, i.e. when a new satellite rises or a satellite drops below the elevation mask. A history of fixes are saved throughout the session and the final result is by default the averaged value.
Float Solution
This method does not attempt to resolve integer ambiguities. Float solution accuracy is largely dependent on the length of the occupation, as float ambiguities improve with time as they converge towards integer values.
Using this setting will process a float solution for the baseline(s) and override the Automatic mode which chooses between fixed and float modes using the baseline distance and tolerances set within the ARTK tab.
The settings within the Advanced tab control whether ionospheric processing and the tropospheric error state are engaged when processing a float solution.
Automatic
Automatic mode chooses between fixed and float modes using the baseline distance and the tolerances set within the ARTK tab as criteria.
The following table contains a list of common solution types in GrafNet.
|
Solution Type |
Fixed |
Ionospheric |
Tropospheric Error State |
Description |
|---|---|---|---|---|
|
L1-Float |
N |
N |
N |
Single frequency float solution without ionospheric correction or tropospheric error state |
|
L1-ARTK |
Y |
N |
N |
Single frequency fixed solution without ionospheric correction or tropospheric error state |
|
L1L2-Float |
N |
N |
N |
Dual frequency float solution without ionospheric correction or tropospheric error state |
|
L1L2-Float-Iono |
N |
Y |
N |
Dual frequency float solution with ionospheric correction and without tropospheric error state |
|
L1L2 Float-Iono-Tropo |
N |
Y |
Y |
Dual frequency float solution with ionospheric correction and tropospheric error state |
|
L1L2-ARTK |
Y |
N |
N |
Dual frequency fixed solution without ionospheric correction or tropospheric error state |
|
L1L2‑ARTK‑Iono |
Y |
Y |
N |
Dual frequency fixed solution with ionospheric correction and without tropospheric error state |
|
L1L2-ARTK-Iono-Tropo |
Y |
Y |
Y |
Dual frequency fixed solution with ionospheric correction and tropospheric error state |