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Radian Motion Sensor
User Manual
Document Ref: UM-8041-C1
Issue: C - Rev 1
© Sonardyne International Limited 2007
4.3 Alignment
Fig 5
Radian’s orientation requirements
Radian delivers measurements of attitude that are valid for its own body reference
frame. This means that its measurements of heading, roll and pitch will all relate
to the FWD, UP and STBD axes marked by labels on Radian’s housing.
For these attitude measurements to be valid for the vessel or vehicle on which Ra-
dian is mounted, it is necessary for Radian to be aligned so that its fore-aft, port-
stbd and up-down axis to align with the corresponding axes on the vessel or vehi-
cle. Fig 5 shows Radian’s alignment references.
In practice, this means that the physical mounting location should be prepared so
that, when mounted, Radian’s alignment meets this requirement.
Depending on the application for which Radian is to be used, it may be the case
that the attitude measurements may be used to provide motion compensation for
external equipment such as sonar imaging systems. In these cases, Radian must
be mounted so that its fore-aft, port-stbd and up-down axes align with those of the
equipment for which it is supplying measurements.
Pitch rotation
Ideally, you should install Radian on the vehicle with its forward axis aligned with
the vehicle’s forward axis, as shown in Fig 5. However, if this is not possible for
mechanical reasons, you can pitch Radian up or down by 90° as necessary, and
rotate the internal axis through software to compensate.
Install Radian as required and open the
Advanced Settings
dialog in the software,
shown in Fig 16 on page 24. Click the
Pitch Up 90°
or the
Pitch Down 90°
button
