Bs - Clear Distance Traveled; Bx - Maximum Tracking Depth - Teledyne WORKHORSE Operation Manual

WorkHorse H-ADCP Operation Manual
2. BM5 Low Altitude Minimum RSSI Bin Size -- This limitation affects only Bottom Mode 5 opera-
tion below the following altitudes:
•
300 kHz -- 10 meters -- the resolution becomes 16 cm
•
600 kHz -- 5 meters -- the resolution becomes 8 cm

BS - Clear Distance Traveled

Purpose Clears internal distance traveled accumulators.
Format BS
Recommended Setting. Use as needed.
Description Distance traveled is calculated and output in DVL output formats (PD5 and PD6). The
accumulator is zeroed on <BREAK> or by using this command in the manual ensemble
cycling mode.
BX – Maximum Tracking Depth
Purpose Sets the maximum tracking depth in bottom-track mode.
Format BXnnnn
nnnn = 10 to 65535 decimeters (meters x 10)
Range
Default BX350 (300 kHz), BX150 (600 kHz)
Recommended Setting. Set BX to a depth slightly greater than the expected maximum depth.
Description The BX-command sets the maximum tracking depth used by the H-ADCP during bottom
tracking. This prevents the H-ADCP from searching too long and too deep for the bottom,
allowing a faster ping rate when the H-ADCP loses track of the bottom. If the bottom-
track water reference layer is in use (BK > 0), BX must be greater than the Far Layer
Boundary (BLmmm,nnnn,ffff), or the H-ADCP sends Error Code 012.
Example If you know the maximum depth in the deployment area is 20 meters (200 decimeters),
set BX to a value slightly larger than 200 dm, say 210 dm, instead of the default 350 dm
for a 300 kHz H-ADCP. Now if the H-ADCP loses track of the bottom, it will stop search-
ing for the bottom at 210-dm (21 m) rather than spend time searching down to 350-dm
(35 m).
The BX command limits the search range for bottom tracking. If the H-ADCP loses lock on the
bottom, it goes into search mode, which iteratively searches increasing ranges until either the
bottom is found or the maximum range is reached, and then the process starts over at the
minimum range. The BX command will prevent the H-ADCP from searching to ranges beyond
the BX range value, and can result in shorter search cycles if the bottom is known to be within
this range.
In addition to limiting the search range, the BX command indirectly limits the bottom track
range. While this does not prevent the H-ADCP from bottom tracking to ranges beyond the BX
range, use caution in setting this command to less than the expected maximum depth as the
H-ADCP will be less likely to hold a lock on the bottom if there is any slope beyond the BX
range.
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
May 2015
Page 137