dankelley/oce — Issue #205: ADCP beam pointing errors?
Author: richardsc
Created: 2012-03-10 02:36:25+00:00
State: open

I found this on page 21:

>Beam pointing errors can be a dominant source of velocity bias. A beam pointing error is uncertainty in the beam direction. Standard manufacturing practice introduces errors into beam angles. Depending on measurement requirements and the care with which the transducer elements were installed, these errors could introduce unacceptable bias. The as-installed beam angles are measured in the manufacturing process and stored in the BroadBand ADCP’s memory. These angles modify the coordinate conver- sion matrix which corrects for beam pointing errors when converting from beam to earth velocity co- ordinates.

This suggests that the "standard" transformation matrix (i.e. the one given in the coordinate transformation manual) can be modified by one stored in the ADCP memory to correct for beam pointing errors. I think the current version of `oce` just applies the standard T-matrix. Is there even another stored T-matrix in the files?