POS MV V5 Installation and Operation Guide
Theory
of Operation
Copyright © Applanix Corporation, 2017
B-19
Figure 89: Geographic Antenna Baseline Vector
POS MV computes a carrier phase differential position solution in geographic co-ordinates of Antenna 2
with respect to Antenna 1. This is the geographical antenna baseline vector:
Ф
ANT
=
tan
-1
E
N
Where:
Ф
ANT
= the geographical antenna baseline vector
E
= the easterly component of the position
difference between Antenna 1 and Antenna 2
N
= the northerly component of the position
difference between Antenna 1 and Antenna 2
Because the geographical antenna baseline vector is referenced to true north, it varies as the vessel
changes course. However, the heading aiding data required by POS MV is the heading of the antenna
baseline referenced to the
x-axis
of the IMU.
POS MV transforms the geographic antenna baseline vector
Ф
ANT
to the geographic IMU heading
Ф
IMU
using the surveyed antenna baseline vector
, which is the antenna baseline vector resolved in the
IMU co-ordinate frame. Figure 90 illustrates these headings and angles.
12
r
Δ
*