3.1. Initialisation of GPS Constants   
 
The GART-2000® CE software initialises GPS receivers using the constants in the Initial > Constants > GPS menu. Alternatively, use the button shown above to choose this menu.
 
GART-2000® CE supports the following differential correction formats for GPS receivers:
 

Ashtech CPD

Ashtech-internal correction format for Z- and mZ-series.
Ashtech code and carrier-phase corrections.
Produces coordinates with cm-accuracy.
Ashtech RTCM 2.0

General format for DGPS.
Ashtech code corrections.
Produces coordinates with m-accuracy.
Ashtech RTCM 2.1

General format for PDGPS.
Code and carrier-phase corrections.
Produces coordinates with cm-accuracy.
Ashtech RTCM ADV

PDGPS format broadcasted from german SAPOS-reference stations.
Ashtech code and carrier-phase corrections.
Produces coordinates with cm-accuracy.
Trimble RTK

Trimble-internal correction format for Trimble 4000 series.
Trimble code and carrier-phase corrections.
Produces coordinates with cm-accuracy.
TPS RTCM 2.0

General format for DGPS.
Topcon/Javad code corrections.
Produces coordinates with m-accuracy.
TPS RTCM 2.1

General format for PDGPS.
Topcon/Javad code and carrier-phase corrections.
Produces coordinates with cm-accuracy.
TPS RTCM 2.2

General format for PDGPS.
Topcon/Javad code and carrier-phase corrections.
Produces coordinates with cm-accuracy.
TPS CMR

General format for PDGPS.
Topcon/Javad code and carrier-phase corrections.
Produces coordinates with cm-accuracy.
TPS RTCM ADV

PDGPS format broadcasted from german SAPOS-reference stations.
Topcon/Javad code and carrier-phase corrections.
Produces coordinates with cm-accuracy.
Standard NMEA

Receiver independent message format.
Control of various receiver types over NMEA messages (GGA, GST, GSV; e.g. for GIS-applications).

 
GART-2000® CE transforms the WGS84 coordinates in real time into a local system using a 7P-transformation (e.g. DHDN) and a projection (e.g. UTM Zone 32). 
 
The transformation parameters can be selected from a list that contains three fixed and seventeen user definable entries (e.g. User018). Use the button >> to change the 7P-transformation.
 
Use the button <Edit> to change the seven parameters.
 
The entries have the following meanings:
 

Name

Name of the set of transformation parameters (user-definable).
Ellipsoid Ellipsoid of the user system.
DX, dY, dZ Translations for X-, Y- and Z-axis.
WX, wY, wZ Rotation with respect to X-, Y- and Z-axis.
Scale Scale factor in ppm

 


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