Specifications
Channel Master Operation Manual
P/N 95B-6001-00 (February 2006) page 141
Bottom Track Modes: There are currently four bottom tracking modes of
operation available from RDI:
Bottom Mode 4: Uses ambiguity resolution, and adjusts lags for re-
duced variance at higher elevations (or deeper depths).
Bottom Mode 5: Specifically designed for reduced variance in shal-
low water/low elevations. It transmits several pings with computa-
tions to best determine depth and speed. This mode is the default
mode, but it will automatically switch to Bottom Mode 4 if condi-
tions warrant.
Bottom Mode 6: Offers special narrow bandwidth operation to re-
duce the potential for interference or for stealth. No ambiguity reso-
lution, instead bottom mode 6 requires user input of an approximate
operating elevation (or depth).
Bottom Mode 7: Similar to bottom mode 5, except that it is opti-
mized for slow-moving platforms in very shallow, high backscatter
environments.
Break: A wake up command to an ADCP or DVL that places the instrument
in command mode.
Broadband ADCP: An ADCP that uses broadband processing.
Broadband Processing: Use of coded pulses to make multiple measure-
ments of phase with a single ping, and thereby greatly increase the precision
of the measurement.
------ C ------
Channel Master: Model name for an ADCP designed to use horizontal
profiling for flow monitoring in inland waterways.
Command Mode: The state into which an ADCP or DVL goes upon receiv-
ing a break. In this mode the ADCP or DVL is waiting to receive a com-
mand. It draws relatively high power, so the ADCP or DVL will go to sleep
if no command is received for five minutes.
Correlation: A key quality control parameter, this is essentially a meas-
urement of how much the particle distribution has changed between phase
measurements. The less the distribution has changed, the higher the corre-
lation, and the more precise the velocity measurement.
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Dead Reckoning: A navigation method where position is estimated by
measuring velocity, heading and time from the last known position.