Leica Geosystems GPS System 500 - Technical Reference Manual - Manual (Page 378)

378 Appendix K Technical Reference Manual-4.0.0en
The GS50 Receiver
The GS50 tracks the L1 C/A code
and uses it to reconstruct the carrier
phase. Data can be stored for post-
processing in SKI-PRO or GIS
DataPRO. Baselines can be
calculated up to a precision of
10-20mm +/-2ppm.
With a radio modem or other DGPS
source the receiver can be used for
real-time measurements accepting
RTCM code corrections. Coordinates
can be calculated with a precision of
up to about 0.4 meters.
The GS50+ Receiver
The GS50+ is a 12 channel L1, 12
channel L2 code and phase GPS
receiver. The standard GS50+
records phase measurements for
post processing and RTK purposes.
Data can be stored for post-process-
ing in SKI-Pro or GIS DataPro.
Baselines can be calculated to a
precision of 5-10 mm +/-1 ppm.
Hardware Configurations and
Specifications
The following pages contain different
possible combinations for connecting
the GS50 / GS50+ sensor with
various accessories.
Centimeter level accuracy can be
obtained by using two GS50+
receivers, one as reference and one
as rover. For real time applications, a
radio modem is needed to transfer
the correction signal from the
reference to the rover.
The following solutions will allow the
user to obtain sub-meter positional
accuracy using the Leica GS50.
With post-processing it is typical to
obtain positional accuracies of 30cm
Hardware and Accessories
With a radio modem the receiver can
be used for RTK measurements.
Coordinates can be calculated with a
precision of up to about 1 m.
One Unit Operation
It is possible to use only one GS50 as
a rover by downloading and post-
processing RINEX data from the
Internet or Public FTP server. The
quality obtained cannot generally be
estimated because it depends on the
quality of public data and the baseline
length
1 . In theory, it should be possible
to obtain 30cm accuracy with
reasonable baseline length
1 and
quality reference data.
Along with the GIS DataPRO
software, the equipment shown in the
chapter “Equipment Setup: Real-Time
Rover, GIS Rover” is sufficient for this
type of application. The same
equipment would also be sufficient for
simple navigation, yielding accuracies
of 2-3 meters.
using 2 GS50s (one as a reference
and the other as a rover.) No
additional options are necessary for a
post-processing arrangement.