Spectra Precision ProFlex 800 Reference Manual - Manual (Page 173)

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Warning! If the azimuth offset is set to a value exceeding 15° from
either North, South, West or East, then the receiver will
deliver the heading component of attitude, but not the pitch
or roll angle.
From the operational point of view, the receiver that uses
“Antenna 1” operates as a rover while the receiver using
“Antenna 2”(external receiver) operates as a moving base.
Activating the external heading mode in your receiver will
necessarily re-configure the receiver using “Antenna 1” as a
rover. If it was previously set up as a base, then it will
instantaneously become a rover as soon as you activate the
heading mode. If it’s already a rover computing RTK
positions, switching to heading mode will not impact the
processing and availability of RTK positions.
The following groups of parameters need to be defined:
• Receiver
• Satellites
• Heading
Antenna #1
Antenna #2
Azimuth Offset= 0°
Antenna #2
Antenna #1
Azimuth Offset= 180°
Antenna #2
Azimuth Offset= 270°
Antenna #1 Antenna #1
Azimuth Offset= 90°
Antenna #2
Heading+Roll
Computed
Heading+Pitch
Computed
(Red arrow indicates the direction for which heading is measured.)