POS MV V4 User Guide
Introduction
Copyright © Applanix Corporation, 2009
1-7
IMPORTANT
Do not open the IMU housing for any reason. Opening the IMU
housing will void the warranty.
While the array of linear accelerometers sense acceleration in all three
directions, the array of gyros sense angular motion around all three axis
centred on the IMU. The PCS receives these measurements from the IMU
and uses them to compute the measurements of motion. Refer to the
Theory
of Operation description starting on page
B-1 for a more detailed explanation
of the POS MV operating theory.
GNSS Receivers
POS MV includes two GNSS receiver cards:
• A primary receiver card that provides the position, velocity and raw
observation information to the POS MV. It also provides a one Pulse
Per Second (PPS) strobe together with a time message that the POS
MV uses to accurately time-stamp data output with Universal Time
Coordinated (UTC) or GPS Time.
• A secondary receiver card, in conjunction with the primary receiver
card, which allows the POS MV to compute GNSS heading aiding by
performing carrier phase differential measurements between the two
GNSS receivers.
The system includes two identical antennas with 15 metre (~49 ¼ feet) long
connection cables. You must connect each receiver to a GNSS antenna to
receive GNSS signals from the orbiting constellation of satellites.
The antennas supplied with the system have excellent phase centre stability.
If you use alternative antennas with the POS MV, Applanix cannot guarantee
the heading or position performance of the system.
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