October 2017 RiverPro and RioPro ADCP Guide
Page 156
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
The LSB is always sent first.
Table 26: 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 en-
semble
Stores the number of bottom-track pings to average together in each ensemble (BP-
command). If BP = 0, the RiverPro/RioPro does not collect bottom-track data. The
RiverPro/RioPro automatically extends the ensemble interval (TE) if BP x TP > TE.
Scaling: LSD = 1 ping; Range = 0 to 999 pings
9-12 5,6 BT delay before reac-
quire
This field is always 0.
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 BT %Gd Minimum This field is always 0.
19,20 10 BM/BT Mode Stores the bottom-tracking mode (BM-command).
21-24 11,12 BE/BT Err Vel Max Stores the error velocity maximum value (BE-command).
Scaling: LSD = 1 mm/s; Range = 0 to 5000 mm/s (0 = did not screen data)
25-32 13–16 Reserved Reserved
33-48 17-24 BT Range/Beam #1-4
BT Range
Contains the two lower bytes of the vertical range from the RiverPro/RioPro to the
water bottom (or surface) as determined by each beam. This vertical range does not
consider the effects of pitch and roll. When bottom detections are bad, BT Range = 0.
See bytes 78 through 81 for MSB description and scaling.
Scaling: LSD = 1 cm; Range = 0 to 65535 cm
49-64 25-32 BT Velocity/Beam
#1-4 BT Vel
The meaning of the velocity depends on the EX (coordinate system) command set-
ting. The four velocities are as follows:
a) Beam Coordinates: Beam 1, Beam 2, Beam 3, Beam 4
b) Instrument Coordinates: 1->2, 4->3, toward face, error
c) Ship Coordinates: Starboard, Fwd, Upward, Error
d) Earth Coordinates: East, North, Upward, Error
65-72 33-36 BTCM/Beam #1-4 BT
Corr.
Contains the correlation magnitude in relation to the water bottom (or surface) as
determined by each beam. Bottom-track correlation magnitudes have the same for-
mat and scale factor as water-profiling magnitudes (Table 5).
73-80 37-40 BTEA/Beam #1-4
BT Eval Amp
Contains the evaluation amplitude of the matching filter used in determining the
strength of the bottom echo.
Scaling: LSD = 1 count; Range = 0 to 255 counts
81-88 41-44 BTPG/Beam #1-4 BT
%Good
Contains bottom-track percent-good data for each beam, which indicate the reliabil-
ity of bottom-track data. It is the percentage of bottom-track pings that have passed
the RiverPro/RioPro’s bottom-track validity algorithm during an ensemble.
Scaling: LSD = 1 percent; Range = 0 to 100 percent
89-92 93-96
97 – 100
45,46 47,48
49,50
Reserved Reserved. These fields are always 0.
101- 116 51-58 Reserved Reserved. These fields are always 0.
117- 124 59-62 Reserved Reserved. These fields are always 0.
125- 132 63-66 Reserved Reserved. These fields are always 255.
133- 140 67-70 Reserved Reserved. These fields are always 0.
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