ashtech HDS800, Reference Manual

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Using the Web Server
–
SHMP Offset
: In case of a “Slant Height” measurement,
enter the SHMP offset (this is a manufacturer
specification) taking care to enter this parameter in the
selected distance unit. See also the diagram and table
below for more information.
NOTE: The
Antenna Radius
and
SHMP Offset
fields are
automatically preset to the right values when you
select an antenna type in the
Receiver Antenna
field.
–
Virtual Antenna
: This option is useful when the rover is
also used to log raw data. In this case, you can specify
a virtual antenna model in this field to emulate a GNSS
antenna other than the one really used.
Choosing a virtual antenna different from the one really
used affects the raw data as if they had been collected
by the virtual antenna, instead of the real one.
When the rover does not have to log raw data, select
“Off” in this field as there is no point using a virtual
antenna in this case.
• Set the parameters relevant to the GNSS constellations
used by the receiver:
–
Position Elevation Mask
: Choose the elevation angle
above the horizon creating the desired reception mask.
After setting this angle, any satellite seen from the
rover with an elevation angle less than the specified
one will be rejected from the list of usable satellites.
The default value is 5°.
–
GLONASS
,
SBAS
: In addition to the GPS, you can ask
the receiver to track the GLONASS and/or SBAS
satellites as well. Enable the options corresponding to
the additional constellations you want the receiver to
use.
Antenna Model P/N Antenna Radius (m) SHMP Offset (m)
ASH-661
ASH-660 802135
802133
0.0953 0.0483
ARP
SHMP Offset
Antenna radius
SHMP