Vaisala IRIS - Testing Radial Velocity Correction; In Situ Testing Suggestions

Make the measurements to the antenna feed horn. The signs of the components must be
strictly observed. The units are meters. Note that the questions in Setup refer to the INU
case. If you have the Gyro Case, enter the corresponding moment arms relative to the ship
center of rotation.
Setup has an additional question regarding the height oset of the INU. This is a fixed
number which is added to the height reported by the INU. Since most INU's accurately
report the height, this number should be set to zero. The value of this number does not
aect the velocity correction.
• Specify the antenna format in Setup, RCP section.
• Specify the Extended Ray Header in Setup, ingest section.
• If you have a Vaisala RCP8, configure as described in Radar Control Processor RCP8
User Guide.
• Use the TASK Configuration menu to turn on and o the velocity correction for each
task.
B.1.5
Testing Radial Velocity Correction
Vaisala provides several programs for testing the velocity correction feature.
B.1.5.1 Using Antenna Utility to Test Velocity Correction
The Antenna utility displays the navigation information that is reported back from the
antenna controller as well as the velocity of the antenna Δy
A
and the velocity correction.
Use the Antenna utility should to verify the following:
• The signs of all angles (pitch, roll, heading).
• The signs of angular velocities (pitch, roll, heading).
• The signs of the translational velocities (u, v, w).
• That the velocity corrections are reasonable and free of glitches caused by unreliable
input data.
For more information, see IRIS and RDA Utilities Guide.
B.1.5.2 Using the Rays Utility to Test Velocity Correction
The Rays utility allows you to examine ingest data.
Also, because RAW products can be brought back from archive to create regenerated ingest
files, you can check data recording.
You can use the Rays utility values to verify the velocity correction algorithm from an
independent calculation.
B.1.6
In Situ Testing Suggestions
You must do the final testing at sea. This is an uncontrolled environment for testing,
however, there is a useful total system test of the velocity correction. Fixed ground targets
should have 0 corrected velocity as observed from the moving platform. Do not use buoys
with radar reflectors. They are excellent targets, but they are generally not stationary.
Appendix B – Radial Velocity Correction
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