RiverPro and RioPro ADCP Guide
October 2017
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 151
Correlation Magnitude, Echo Intensity, Per-
cent-Good, and Status Data Format
BIT POSITIONS
BYTE
7/S
6
5
4
3
2
1
0
1
ID CODE
LSB
2
MSB
3
DEPTH CELL #1, FIELD #1
4
DEPTH CELL #1, FIELD #2
5
DEPTH CELL #1, FIELD #3
6
DEPTH CELL #1, FIELD #4
7
DEPTH CELL #2, FIELD #1
8
DEPTH CELL #2, FIELD #2
9
DEPTH CELL #2, FIELD #3
10
DEPTH CELL #2, FIELD #4
↓
(SEQUENCE CONTINUES FOR UP TO 200 CELLS)
↓
511
DEPTH CELL #200, FIELD #1
512
DEPTH CELL #200, FIELD #2
513
DEPTH CELL #200, FIELD #3
514
DEPTH CELL #200, FIELD #4
See Table 22 through Table 25 for a description of the fields.
Figure 33.
Correlation Magnitude, Echo Intensity, Percent-Good, and Status Data Format
The number of cells for all profile data types is dynamic and will change from ensemble to
ensemble. The maximum cell count is 200.
Correlation magnitude data give the magnitude of the normalized echo autocorrelation at the lag used for
estimating the Doppler phase change. The RiverPro/RioPro represents this magnitude by a linear scale
between 0 and 255, where 255 is perfect correlation (i.e., a solid target). A value of zero indicates bad cor-
relation values.
Table 22:
Correlation Magnitude Data Format
Hex Digit
Binary Byte
Field
Description
1-4
1,2
ID Code
Stores the correlation magnitude data identification word (00 02h).
5,6
3
Depth Cell 1, Field 1
Stores correlation magnitude data for depth cell #1, beam #1. See above.
7,8
4
Depth Cell 1, Field 2
Stores correlation magnitude data for depth cell #1, beam #2. See above.
9,10
5
Depth Cell 1, Field 3
Stores correlation magnitude data for depth cell #1, beam #3. See above.
11,12
6
Depth Cell 1, Field 4
Stores correlation magnitude data for depth cell #1, beam #4. See above.
13 – 1028
7 – 514
Cells 2 – 200 (if
used)
These fields store correlation magnitude data for depth cells 2 through 200 for all
four beams. These fields follow the same format as listed above for depth cell 1.
