September
2017
Sentinel V SC and RT Operation Manual
Page 284
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Table 52:
Bottom-Track Data Format
Hex Digit Binary
Byte
Field
Description
81-88
41-44
BTPG/Beam #1-4
BT %Good
Contains bottom-track percent-good data for each beam, which
indicate the reliability of bottom-track data. It is the percentage of
bottom-track pings that have passed the Sentinel V 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.
141- 144
71,72
BX/BT Max.
Depth
Stores the maximum tracking depth value (BX-command).
Scaling: LSD = 1 decimeter; Range = 80 to 9999 decimeters
145-152
73-76
RSSI/Bm #1-4
RSSI Amp
Contains the Receiver Signal Strength Indicator (RSSI) value in the
center of the bottom echo as determined by each beam.
Scaling: LSD
≈
0.45 dB per count; Range = 0 to 255 counts
153, 154
77
GAIN
Contains the Gain level for shallow water. See WJ-command.
155-162
78-81
BT Range
MSB/Bm #1-4
Contains the most significant byte of the vertical range from the
Sentinel V 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 17
through 24 for LSB description and scaling.
Scaling: LSD = 65,536 cm, Range = 65,536 to 16,777,215 cm
