Spectra Precision ProFlex 800 Reference Manual - Manual (Page 83)

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Using the Web Server
– Receiver Antenna: Specify the model of GNSS antenna
used by the receiver. Select “UNKNOWN” if you don’t
know which model is used.
– Antenna Radius: In case of a “Slant Height”
measurement, enter the antenna radius (this is a
manufacturer specification), taking care to enter this
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.
Antenna Model P/N Antenna Radius (m) SHMP Offset (m)
ASH-661
ASH-660 802135
802133
0.0953 0.0483
MAG111406 111406 0.0921 0.0516
ARP
SHMP Offset
Antenna radius
SHMP