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May
2015
WorkHorse H-ADCP Operation Manual
Page 220
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
BIT POSITIONS
BYTE
7/S
6
5
4
3
2
1
0
75
BM#3 RSSI AMP
76
RESERVED
77
GAIN
78
(*SEE BYTE 17)
MSB
79
(*SEE BYTE 19)
MSB
80
(*SEE BYTE 21)
MSB
81
(*SEE BYTE 23)
MSB
82
RESERVED
83
84
85
Figure 52.
Binary Bottom-Track Data Format
This data is output only if the BP-command is > 0 and PD0 is selected. See Table 43
for a
description of the fields.
The PD0 output data format assumes that the instrument is stationary and the bottom is
moving. DVL (Speed Log) output data formats (see
) assume that
the bottom is stationary and that the H-ADCP or vessel is moving.
The H-ADCP uses these commands for “range” to boundary applications. The H-ADCP is NOT
designed for moving vessel Bottom Track applications.
This data is output only if the BP-command is greater than zero and PD0 is selected. The LSB is always
sent first.
Table 43:
Bottom-Track Data Format
Hex Digit
Binary Byte
Field
Description
1-4
1,2
ID Code
Stores the bottom-track data identification word (00 06h).
5-8
3,4
BP/BT Pings per
ensemble
Stores the number of bottom-track pings to average together in each ensemble (BP-
command). If BP = 0, the H-ADCP does not collect bottom-track data. The H-ADCP
automatically extends the ensemble interval (TE) if BP x TP > TE.
Scaling: LSD = 1 ping; Range = 0 to 999 pings
9-12
5,6
BD/BT delay before
reacquire
Stores the number of H-ADCP ensembles to wait after losing the bottom before trying
to reacquire it (BD-command).
Scaling: LSD = 1 ensemble; Range = 0 to 999 ensembles
13,14
7
BC/BT Corr Mag Min
Stores the minimum correlation magnitude value (BC-command).
Scaling: LSD = 1 count; Range = 0 to 255 counts
15,16
8
BA/BT Eval Amp Min
Stores the minimum evaluation amplitude value (BA-command).
Scaling: LSD = 1 count; Range = 1 to 255 counts
17,18
9
BG/BT %Gd Mini-
mum
Stores the minimum percentage of bottom-track pings in an ensemble that must be
good to output velocity data (BG-command).
19,20
10
BM/BT Mode
Stores the bottom-tracking mode (BM-command).