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StreamPro ADCP Operation Manual10.4 Velocity Data FormatBIT POSITIONSBYTE 7/S 6 5 4 3 2 1 01 LSB 00hVELOCITY ID = 01002MSB 01h3 LSBDEPTH CELL #1, VELOCITY 14MSB5 LSBDEPTH CELL #1, VELOCITY 26MSB7 LSBDEPTH CELL #1, VELOCITY 38MSB9 LSBDEPTH CELL #1, VELOCITY 410MSB11 LSBDEPTH CELL #2, VELOCITY 112MSB13 LSBDEPTH CELL #2, VELOCITY 214MSB15 LSBDEPTH CELL #2, VELOCITY 316MSB17 LSBDEPTH CELL #2, VELOCITY 418MSB↓ (SEQUENCE CONTINUES FOR UP TO 128 CELLS) ↓1019 LSBDEPTH CELL #128, VELOCITY 11020MSB1021 LSBDEPTH CELL #128, VELOCITY 21022MSB1023 LSBDEPTH CELL #128, VELOCITY 31024MSB1025 LSBDEPTH CELL #128, VELOCITY 41026MSBSee Table 12, page 73 for description of fieldsFigure 28. Velocity Data FormatNOTE. The number of depth cells is set by the WN-command.page 72Teledyne RD Instruments
StreamPro ADCP Operation ManualThe StreamPro packs velocity data for each depth cell of each beam into atwo-byte, two’s-complement integer [-32768, 32767] with the LSB sentfirst. The StreamPro scales velocity data in millimeters per second (mm/s).A value of –32768 (8000h) indicates bad velocity values.All velocities are relative based on a stationary instrument. To obtain absolutevelocities, algebraically remove the velocity of the instrument. For example,RELATIVE WATER CURRENT VELOCITY: EAST 650 mm/sINSTRUMENT VELOCITY: (-) EAST 600 mm/sABSOLUTE WATER VELOCITY : EAST 50 mm/sThe setting of the EX-command (Coordinate Transformation) determineshow the StreamPro references the velocity data as shown below.EX-CMD COORD SYS VEL 1 VEL 2 VEL 3 VEL 4xxx00xxx BEAM TO BEAM 1 TO BEAM 2 TO BEAM 3 TO BEAM 4xxx01xxx INST Bm1-Bm2 Bm4-Bm3 TO XDUCER ERR VELxxx10xxx SHIP PRT-STBD AFT-FWD TO SURFACE ERR VELxxx11xxx EARTH TO EAST TO NORTH TO SURFACE ERR VELPOSITIVE VALUES INDICATE WATER MOVEMENTTable 12:Hex DigitBinaryByteVelocity Data FormatFieldDescription1-4 1,2 Velocity ID Stores the velocity data identification word 0100 (00 01h). LSBis sent first.5-8 3,4 Depth Cell 1,Velocity 19-12 5,6 Depth Cell 1,Velocity 213-16 7,8 Depth Cell 1,Velocity 317-20 9,10 Depth Cell 1,Velocity 421-2052 11-1026 Cells 2 – 128(if used)Stores velocity data for depth cell #1, velocity 1. See above.Stores velocity data for depth cell #1, velocity 2. See above.Stores velocity data for depth cell #1, velocity 3. See above.Stores velocity data for depth cell #1, velocity 4. See above.These fields store the velocity data for depth cells 2 through128 (depending on the setting of the WN-command). Thesefields follow the same format as listed above for depth cell 1.P/N 95B-6003-00 (February 2008) page 73
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