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38 SPAN-CPT User Manual Rev 8
Chapter 4 SPAN-CPT Dual-Antenna
Figure 11: SPAN-CPT - Dual Antenna Installation
4.2 Configuring SPAN with ALIGN on SPAN-CPT
Before configuring the ALIGN solution, the two receivers MUST both be powered on and connected
directly between COM2 of the SPAN receiver and COM2 of the second receiver through either a null
modem cable or an appropriate radio connection.
To enable the dual-antenna ALIGN solution to aid the INS alignment and provide heading updates, the
offset between the antennas and the IMU must be known. This is achieved by entering lever arms to both
antennas, using the SETIMUTOANTOFFSET and SETIMUTOANTOFFSET2 commands.
To configure SPAN with ALIGN Aiding:
1. Enter the lever arm from the SPAN-CPT to the primary antenna (primary antenna is connected to the
SPAN-CPT) using the SETIMUTOANTOFFSET command.
Abbreviated ASCII example:
SETIMUTOANTOFFSET 0.54 0.32 1.20 0.03 0.03 0.05
2. Enter the lever arm from the SPAN-CPT to the secondary antenna (secondary antenna is connected
to the OEM6 receiver) using the SETIMUTOANTOFFSET2 command.
Abbreviated ASCII example:
SETIMUTOANTOFFSET2 0.54 2.32 1.20 0.03 0.03 0.05
COM 1
I/O
COM 2
Primary GNSS Antenna Secondary GNSS Antenna
Connect COM2 to COM2
Secondary
Receiver
(Rover)
SPAN
Receiver
(Master)
USBUSB
Power Supply
The rover receiver must be an ALIGN-capable model, such as D2S-Z00-000, running the
latest OEM6 firmware version.