May
2015
WorkHorse H-ADCP Operation Manual
Page 236
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
H-ADCP Condensed 2D Output Format (PD14)
This section details the specification of an output format for data consisting of a header (with timestamp),
a two dimensional profile of velocity, acoustic intensity, and standard error data, tilt sensor data, stage
data, and a checksum. This format is primarily intended for use in horizontal H-ADCP applications. Data
will be output in this format when PD14 is selected as the output format.
This Output Data Format is only available for Horizontal H-ADCPs with firmware version 11.05
or later.
PD14 Format
Table 50 below summarizes the PD14 format. The number of bytes in the ensemble, not including the
checksum is reported in the NBytes field and is equal to 10 * NBins + 23 bytes, where NBins is the number
of range cells in the profile. The NEnsemble field shows the number of ensembles since the start of a de-
ployment and provides for tracking sequences of ensembles and distinguishing one ensemble from anoth-
er. Tilts are reported as signed quantities in the interval –180.00 to +180.00 degrees. Stage measure-
ments are reported as unsigned quantities in units of 1/10
th
mm. Velocities are reported as signed quanti-
ties in mm/sec. Acoustic intensities are reported in unsigned units of counts. Standard error will be re-
ported as unsigned quantities in mm/sec. The checksum will be calculated as described by the CRC-16
algorithm using the polynomial x
16
+x
15
+x
2
+1 with an initial register value of 0xFFFF.
PD14 Invalid Data
Several quantities may on occasion be out of range or may not pass quality checks. In such cases, an inva-
lid result will be indicated. For tilts, an invalid result will be indicated by a value of –327.68 degrees. Inva-
lid velocities are indicated by a value of –32768 mm/s. Invalid standard error will be indicated by a value
of 65535 (all bits set). Invalid stage measurements are indicated by a value of 42949.67295 meters (all bits
set). No provision will be made for any other invalid quantities in this format.
Table 50:
PD14 Output Data Format
Position
Size
Name
Description
0
2
SOE
Start of ensemble - always 0x8F8F
2
2
NBytes
Number of bytes
4
2
NEnsemble
Number of ensembles since start of deployment
6
2
Year
4-digit year
8
1
Month
Month
9
1
Day
Day of month
10
1
Hour
Hour of day since midnight
11
1
Minutes
Number of minutes since the last hour
12
1
Seconds
Number of seconds since the last minute
13
1
Hundredths
Hundredths of a second since the last second
14
2
Tilt 1
Tilt 1 measurement in 1/100
th
degree
16
2
Tilt 2
Tilt 2 measurement in 1/100
th
degree
18
4
Vertical
Vertical stage measurement in 1/10
th
millimeter
22
1
NBins
Number of profile bins
23
2
X1
X component of velocity for bin 1
25
2
Y1
Y component of velocity for bin 1