Teledyne RD Instruments SENTINEL V REAL-TIME, Operation Manual

Page: 299 / 343

Sentinel V SC and RT Operation Manual
September
2017
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 283
The LSB is always sent first.
Table 52: 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 Sentinel V does not
collect bottom-track data. The Sentinel V automatically extends the
ensemble interval (TE) if BP x TP > TE.
Scaling: LSD = 1 ping; Range = 0 to 999 pings
9-12 5,6 Reserved 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 Reserved 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 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 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 setting. 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 format 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