48
Base Station Coordinates (Antenna Phase Center)
Note that the reference geodetic coordinates specified in this tab will relate to the antenna
L1
phase center.
There are three ways to enter the geodetic coordinates of the base antenna’s L1 phase center:
(1) Type in the precise latitude/longitude and ell. height manually (use the Lat, Lon
and Alt edit boxes).
(2) Use the absolute coordinates averaged over the specified time interval (with the
Averaged and Avg.Span controls. The corresponding receiver parameters are
/par/ref/avg/mode and /par/ref/avg/span, respectively.
(3) Use the instant absolute coordinates from the receiver (by pressing the Get from
receiver button).
As the names of the radio buttons GPS/GLO at one time and GPS/GLO separately
imply, these allow the user to specify for GPS and GLONASS either common reference coordinates
or “individual” reference coordinates. In most cases it is recommended to use the same reference
coordinates both for GPS and GLONASS. After the user has selected GPS/GLO separately,
he/she will see the GLONASS tab appear on the screen too. The GPS/GLO at one time
radio button is associated with the receiver parameter /par/ref/pos//geo. GPS/GLO separately
corresponds to the receiver parameters /par/ref/pos/gps/geo for GPS and /par/ref/pos/glo/geo for GLON-
ASS.
Pressing the Datum Parameters button will open the <Datum ID> Datum
Parameters w indow . In this window you can not only
view
the ellipsoid and transformation
parameters of the datums selectable from the Current Datum list box but also
edit
the trans-
formation parameters for USER and P90. In addition one can edit the ellipsoid parameters of USER
in this window.
Structurally this window is similar to that shown in Figure 29.
In the East, North and Height edit boxes, the user specifies the offsets from the marker to
ARP. These edit boxes corresponds to the receiver parameter /par/ref/ant/offs.
RTCM Settings
The Station ID edit box is associated with the receiver parameter /par/rtcm/base/stid. This pa-
rameter allows the user to assign a separate station ID to each reference station working in the
area.
With the Max. number of Satellites edit box, the user specifies the maximum number of
satellites allowed for use in RTCM messages types 18 through 21. A 0 means that all of the avail-
able satellites will be included in the above mentioned RTCM message types. If an RTK system has
a slow modem (the baud rate is less than 9600 bps), it is recommended to restrict the number of
satellites included in these messages. The limitation allows the user to reduce the amount of data
sent by the base station, which helps to avoid the data link overload. If the actual number of satel-
lites in sight exceeds the value entered in this edit box, the RTCM messages will include data only
To Next Page
Loading...