Healy - Acoustic Doppler Current Profiler (ADCP)

Healy was delivered with Broadband ADCPs, a 300kHz and 150kHz.  The
300kHz instrument never really worked, and in 2002, it was replaced
with 75kHz phased array “Ocean Surveyor” ADCP.  During the winter
inport period of 2010, the 150kHz Broadband ADCP was replaced with a
150kHz phased array “Ocean Surveyor” (loaned by Univ Alaska,
Fairbanks).  These are referred to as OS75 and OS150, respectively.

Efforts to improve data quality are discussed in the
reports (below).  These reports also contain the most
up-to-date information about computer and
serial port configuration, messages acquired, and a
detailed evaluation of the performance of the two instruments.

In summary, both instruments suffer from reduced range
and bias in the broadband mode.  They still function
in narrowband mode. Serial heading is acquired from
two Sperry gyro-compasses, the Ashtech ADU5, and the POSMV.  
The latter two and a PCode GPS all provide positions.

ADCP Data acquisition and processing are handled by a
linux computer running UHDAS software (University of
Hawaii). UHDAS is a system designed to support scientists
at sea, with the goal of getting the data product
(ocean velocities) as close to science-ready as is
practical in an autonomous installation.  On many ships,
there is only a little touch-up necessary (editing and
calibration) after a cruise.  For those steps or
to completely reprocess the data, the core processing
code "CODAS" is available to download and install.

UHDAS+CODAS documentation
A short introduction to UHDAS
RDI Ocean Surveyor Specifications