Table 25 Velocity Correction for Aircraft Tail Radars
Parameter Description
Azimuth Because the axis of primary rotation is horizontal, azimuth is the angle relative to a
perpendicular scan. Thus zero means scanning in a plane, positive means scanning a cone
faced forwards, and negative means scanning in a cone faced backwards.
Elevation Because the axis of primary rotation is horizontal, elevation is the angle of rotation about the
axis of aircraft motion, with zero pointing out towards the left wing, and positive going up
from there.
Recorded
angles
Recorded angles are aircraft relative, and all angle syncing is done aircraft relative.
It does not make sense to correct the angles to earth relative before recording.
Roll and pitch Reversed sign on airplanes against ships.
The computation of the A matrices defined for ships have the reversed sign. Note that since no
other interpretation of the roll and pitch is done, this can otherwise be ignored.
The antenna vector relative to the aircraft is as follows:
x′ =
−cos EL cos AZ
sin AZ
sin EL cos AZ
AZ and EL are aircraft relative
Before computing the velocity correction dot product, we first must convert to earth
relative, using the equation above:
x = A
−1
x
After that, everything is the same as for ships.
B.1.4
Configuring Radial Velocity Correction
You must input the moment arm vector components in the Setup utility:
INU Case Δy'
AI!
:
Δy'
AI1
Antenna distance forward of INU in deck plane.
Δy'
AI2
Antenna distance to port of INU in deck plane.
Δy'
AI3
Antenna distance upward from INU normal to deck plane.
Gyro Case Δy'
AS
:
Δy'
AS1
Antenna distance forward of ship center in deck plane.
Δy'
AS2
Antenna distance to port of center line in deck plane.
Δy'
AS3
Antenna distance upward from ship center normal to deck plane.
IRIS Product and Display User Guide M211319EN-H
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