RDI narrowband 153kHz ADCP

PMEL narrowband ADCPs are set to collect data with nominal 8m bin widths at a 3 second sample rate for 15 minutes (300 pings) once per hour. Each hourly ensemble records 44 depth bins of data.

At each depth bin the data recorded include zonal, meridional, vertical and error velocity, the echo intensity for each of the four beams, and the percent good for 3 beam solutions and the percent good for 3 and 4 beam solutions.

Velocity Corrections:

When the ADCP converts the frequency shift to velocity it assumes a sound speed at the transducer of 1536 m/s. The actual sound speed at the transducer can be computed from the pressure, temperature and salinity data measured at the transducer by the microcat or the seacat.

corrected velocity = uncorrected velocity * C / 1536m/s

where C is the actual sound speed at the transducer.

The horizontal velocity components are rotated as needed according to the compass calibrations.