H-Adcp Condensed 2D Output Format (Pd14); Pd14 Format; Pd14 Invalid Data; Table 50: Pd14 Output Data Format - Teledyne WORKHORSE Operation Manual

May 2015

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
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

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
0 2
2 2
4 2
6 2
8 1
9 1
10 1
11 1
12 1
13 1
14 2
16 2
18 4
22 1
23 2
25 2
Page 236
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
+x +x +1 with an initial register value of 0xFFFF.
16 15 2
Name Description
SOE Start of ensemble - always 0x8F8F
NBytes Number of bytes
NEnsemble Number of ensembles since start of deployment
Year 4-digit year
Month Month
Day Day of month
Hour Hour of day since midnight
Minutes Number of minutes since the last hour
Seconds Number of seconds since the last minute
Hundredths Hundredths of a second since the last second
Tilt 1 Tilt 1 measurement in 1/100
Tilt 2 Tilt 2 measurement in 1/100
Vertical Vertical stage measurement in 1/10
NBins Number of profile bins
X1 X component of velocity for bin 1
Y1 Y component of velocity for bin 1
WorkHorse H-ADCP Operation Manual
mm. Velocities are reported as signed quanti-
th
degree
th
degree
th
millimeter
th