Vaisala IRIS - Appendix B: Radial Velocity Correction; Radial Velocity Correction; Motion Parameters and Coordinate Transformations; Table 24 Basic Variables of Ship Motion Sensing

Appendix B. Radial Velocity
Correction
B.1 Radial Velocity Correction
The motion of a ship or airborne platform induces a radial velocity error. IRIS corrects for this
error by accounting for the platform motion.
Ship motion measurements are collected from the antenna controller and the radial velocity
correction is optionally applied to the ingest files so that all subsequent products and the
real time display are corrected. Note that the radial velocity correction and all of the
platform motion parameters are archived as part of the extended ray header.
B.1.1
Motion Parameters and Coordinate Transformations
For systems with the Vaisala RCP8, see the theoretical derivation of the stabilization in
Radar Control Processor RCP8 User Guide.
Table 24 Basic Variables of Ship Motion Sensing
Symbol Definition
H Heading measured CW from true north
θ H - π/2
#thetaoverdot#
Rate of change of heading
P Pitch measured relative to horizon + for bow down
#Poverdot#
Rate of change of pitch
R Roll measured relative to the horizon + for port side down
#Roverdot#
Rate of change of roll
u Eastward velocity
v Northward velocity
w Upward velocity
Given a vector x in earth coordinates and the corresponding vector x
#prime#
in ship
coordinates,
x′ = Ax and x = A
−1
x′
where the transformation matrices are:
IRIS Product and Display User Guide M211319EN-H
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