Leica Geosystems GPS System 500 - Technical Reference Manual - Manual (Page 121)

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5. Configuring the Receiver Technical Reference Manual-4.0.0en
Real-Time 1/2
Configures the parameters used for
Real-Time operations. If needed, it is
possible to configure two real-time
interfaces.
R-Time Data - defines the operation
mode of the receiver. Select
Reference to broadcast real-time
data.
Data Format - Defines the format
used to broadcast the real-time data.
Port - defines the port to which the
Real-Time data will be sent. Normally
a radio modem or GSM phone will be
connected to the port. When the radio
modem is a Satelline, Pacific Crest or
GSM phone it will be mounted in the
radio housing box and attached to
either Port 3 or Port 1.
You may also attach a radio modem
or phone via a cable to any port.
Use the right or left cursor keys to
select a port for transmission of real-
time data. The device that is currently
assigned to this port will be displayed.
Rate - Set the rate at which you wish
to output messages. System 500
supports rates of 0.1 to 60 seconds.
To define the Data Format, highlight
the Data Format field and press
ENTER.
Leica is the proprietary Leica real-
time GPS data format. This is the
best format to use when working
exclusively with Leica System 500
Rover units.
CMR and CMR+ are compacted
formats used to broadcast data for
third party receivers.
RTCM is for use when Rover units
from a different manufacturer will be
used. RTCM message 3 is always
generated irrespective of which other
message types are chosen.
RTCM 18, 19 - Uncorrected Carrier
phase and pseudorange. Use for
RTK operations where the
ambiguities will be resolved at the
Rover (RTK). An accuracy of around
1-5cm (rms) can be expected after a
successful ambiguity resolution.
RTCM 20, 21 - RTK Carrier phase
corrections and high-accuracy
pseudorange corrections. Use for
RTK operations. There is little or no
difference in the accuracy obtained
using these messages as compared
to messages 18 and 19.
RTCM 1, 2 - Differential and Delta
Differential GPS corrections. Use for
DGPS applications. An accuracy of
0.5-5m rms can be expected at the
Rover.