5
Radian Motion Sensor
User Manual
Document Ref: UM-8041-C1
Issue: C - Rev 1
© Sonardyne International Limited 2007
CAUTION
Depth rating
Available in two different pressure housings and accepting a wide range of input
supply voltages, Radian can be mounted on vessels, ROVs, AUVs and submers-
ible structures. The different pressure housings provide options of depth rating to
300 metres (Type 8041–001–01), or 3000 metres (Type 8041–001–02).
Applications
Typical applications where you can use Radian include:
inshore hydrographic survey
motion compensation of echosounders, bathymetric systems and dynamic
positioning systems
compensation of orientation displays and imaging sonar systems on
remotely operated vehicles (ROVs), and
compensation of dead-reckoning and imaging sonar systems on autonomous
underwater vehicles (AUVs).
Communications
Radian supports communication through serial RS232 or RS485 communica-
tions.
Software supplied by Sonardyne allows you to view Radian’s measurements in
real time, and to send measurements for use by external receiving systems.
Refer to section 4 “Installation” beginning on page 12 for instructions to connect
Radian to receive power and to transmit measurements.
Magnetic
calibration
The software also guides you through a magnetic calibration procedure, so that
Radian can continue to operate where there are local disturbances in the earth’s
magnetic field caused, for example, by large ferrous structures. Once calibrated,
the resulting compensation table is stored within the device so that output meas-
urements will require no further correction while operating in the same area.
Refer to section 6 “Magnetic Calibration” beginning on page 29 for detailed in-
structions to calibrate Radian’s earth magnetic field sensors.
2.3 Precautions
Radian is a delicate precision instrument and must be treated as such to
ensure it continues to perform reliably and to its stated specification. In par-
ticular, take note of the precautions described in this sub-section.
Shock and
vibration
The accelerometers, rate-of-turn gyros and earth magnetic field sensors are sus-
ceptible to damage from high levels of shock or sustained vibration. They cannot
be repaired in the field if damaged, and must be replaced in the factory with new
components if they fail. Following component replacement, Radian must be re-
calibrated fully and re-programmed with the new calibration details.
While waiting to install Radian, leave it in the shock-protective packing used to
transport it to you. Remove Radian from its transport packing only when you are
ready to mount it at the installation location.
Always handle Radian carefully when you unpack and install it. Choose an instal-
lation location where Radian is protected against impact and where it is unlikely
there will be sustained and excessive vibration.
Retain the original transit packing and use it to store the system if you ever need
to de-mount Radian. Always use proper shock-protective packing for the system
if you ever need to transport Radian for any reason.
