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D Series 4000
D.5.7 Other Configuration Options
D.5.8 Receiver Status
D.5.9 Almanacs
Some options that can be configured on GPS Pathfinder receivers are
fixed to specific values by the Series 4000 receivers:
The SNR mask is fixed at 4.0 by the Series 4000 receivers.
The PDOP switch is fixed at the same value as the PDOP mask
by the Series 4000 receivers.
The Dynamics code is fixed at Land by the Series 4000
receivers.
In the Position filters configuration form, these three fields have the
value ‘Unused’ when connected to a Series 4000 GPS receiver. In this
context they cannot be edited.
The maximum PDOP mask which can be set on a Series 4000 GPS
receiver by the Asset Surveyor software is 25.4. If you configure the
PDOP mask in the Asset Surveyor software to a greater value, Asset
Surveyor sets the Series 4000 receiver’s PDOP mask to 25.4.
When the PDOP value exceeds the configured PDOP mask, the Series
4000 receiver stops supplying an up-to-date VDOP or HDOP value to
the Asset Surveyor software. In this case, these values are shown as
0.0intheReceiver status form.
The Asset Surveyor software does not record an almanac when
connected to a Series 4000 receiver, and does not send an almanac to
the receiver on startup. The Series 4000 receivers maintain their own
internal almanac to make sure acquisition of satellites is rapid.
In order to obtain an almanac for use in Mission Planning, you can
start a survey on the Series 4000 receiver’s front panel and extract this
data from the receiver’s internal memory as described in RTK for
Mapping and GIS General Reference.
266 TSC1 Asset Surveyor Operation Manual