Teledyne WORKHORSE Operation Manual page 233

WorkHorse H-ADCP Operation Manual
Table 43: Bottom-Track Data Format
Hex Digit Binary Byte
21-24 11,12
25-32 13–16
33-48 17-24
49-64 25-32
65-72 33-36
73-80 37-40
81-88 41-44
89-92 93-96 45,46 47,48
97 – 100 49,50
101- 116 51-58
117- 124 59-62
125- 132 63-66
133- 140 67-70
141- 144 71,72
145-152 73-76
153, 154 77
Field Description
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)
Reserved Reserved
BT Range/Beam #1-3 Contains the two lower bytes of the vertical range from the H-ADCP to the sea bottom
BT Range (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
BT Velocity/Beam The meaning of the velocity depends on the EX (coordinate system) command setting.
#1-3 BT Vel 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
BTCM/Beam #1-3 BT Contains the correlation magnitude in relation to the sea bottom (or surface) as de-
Corr. termined by each beam. Bottom-track correlation magnitudes have the same format
and scale factor as water-profiling magnitudes (Table 5).
BTEA/Beam #1-3 Contains the evaluation amplitude of the matching filter used in determining the
BT Eval Amp strength of the bottom echo.
Scaling: LSD = 1 count; Range = 0 to 255 counts
BTPG/Beam #1-3 BT Contains bottom-track percent-good data for each beam, which indicate the reliability
%Good of bottom-track data. It is the percentage of bottom-track pings that have passed the
H-ADCP's bottom-track validity algorithm during an ensemble.
Scaling: LSD = 1 percent; Range = 0 to 100 percent
Ref Layer (Min, Near, Stores the minimum layer size, the near boundary, and the far boundary of the BT
Far) water-reference layer (BL-command).
Scaling (minimum layer size): LSD = 1 dm; Range = 0-999 dm
Scaling (near/far boundaries): LSD = 1 dm; Range = 0-9999 dm
Ref Vel/Beam #1-4 Contains velocity data for the water reference layer for each beam. Reference layer
Ref Layer Vel velocities have the same format and scale factor as water-profiling velocities (Table
38). The BL-command explains the water reference layer.
RLCM/Bm #1-3 Ref Contains correlation magnitude data for the water reference layer for each beam.
Corr Reference layer correlation magnitudes have the same format and scale factor as wa-
ter-profiling magnitudes (Table 5).
RLEI/Bm #1-3 Ref Int Contains echo intensity data for the reference layer for each beam. Reference layer
intensities have the same format and scale factor as water-profiling intensities.
RLPG/Bm #1-3 Ref Contains percent-good data for the water reference layer for each beam. They indicate
%Good the reliability of reference layer data. It is the percentage of bottom-track pings that
have passed a reference layer validity algorithm during an ensemble.
Scaling: LSD = 1 percent; Range = 0 to 100 percent
BX/BT Max. Depth Stores the maximum tracking depth value (BX-command).
Scaling: LSD = 1 decimeter; Range = 80 to 9999 decimeters
RSSI/Bm #1-3 RSSI Contains the Receiver Signal Strength Indicator (RSSI) value in the center of the bottom
Amp echo as determined by each beam.
Scaling: LSD ≈ 0.45 dB per count; Range = 0 to 255 counts
GAIN Contains the Gain level for shallow water. See WJ-command.
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
May 2015
Page 221