ashtech HDS800, Reference Manual

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Using the Web Server
parameter in the selected distance unit. See also the
diagram below for more information.
–
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 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 used to emulate a GNSS
antenna other than the one really used.
Choosing a virtual antenna different from the one really
used affects the raw and differential data as if they had
been collected by the virtual antenna, instead of the
real one.
A virtual antenna is needed at a base when rovers from
different GNSS manufacturers cannot operate from
that base because of the unknown model of GNSS
antenna used by the base. In that case, defining a
virtual antenna at the base will solve the problem. One
of the most frequently used virtual antennas is the
universal ADVNULLANTENNA antenna.
• Set the parameters relevant to the GNSS constellations
used by the receiver:
–
Recording and Output Elevation Mask
: Choose the
elevation angle above the horizon creating the desired
mask. After setting this angle, any satellite seen from
the base with an elevation angle less than the specified
one will be rejected from the list of tracked satellites.
The recording elevation mask affects the
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