Aanderaa DCPS 5400 Operating Manual page 22

Page 22
Heading Parameter
ENUM
Id
Heading Alignment
Float
Offset[Deg.M]
The interval is an enumerated type. On Software versions prior to version 8.1.27 this was not enumerated but
1)
restricted to the same intervals. The enumerated value for the Interval is shown when sending a Help command to the
sensor (10 sec, 20 sec, 30 sec, 1 min, 2 min etc.) On Software version before version 8.1.27 the interval input was only
the number of seconds without time unit, i.e 10 was 10 seconds, 60 if 1 minute, 3600 if 1 hour etc.
Magnetic declination (variation) is the angle between the magnetic north and the true north. This angle varies
2)
depending on the position on the Earth's surface and also varies over time. Declination is positive when magnetic north
is east of true north and negative when it is to the west (input angle value ±180°). Magnetic declination at the
deployment location can be found for i.e. on NOAA website:
The sensor can compensate for variable Temperature, Conductivity and Pressure when installed on a SeaGuardII or
3)
SmartGuard Datalogger. If the Datalogger has these sensors connected, the DCPS5400 can be configured to take the
input from these sensors to calculate Depth, Salinity, Density and Sound Speed. The calculated depth is also used
when surface cell and surface referred columns are enabled. If only some of the sensors are present, the DCPS can
also combine sensor inputs and settings to calculate the derived sound speed. See Chapter 5.4 for explanation of
Parameter Input when connected to a SeaGuardII or SmartGuard Datalogger.
The accuracy of the estimated current speeds depends on a correct sound speed setting. The cell positioning also
4)
depends on the sound speed. The best way to compensate for variable sound speed is described above in
A Pressure/Tide/Wave&Tide sensor which is connected to the same SmartGuard/SeaGuardII can be used as
5)
parameter input to the DCPS-sensor to give the calculated depth. If no pressure sensor is available, the Fixed
Installation Pressure is used by the sensor if the surface cell or the surface reference is enabled. The Fixed Installation
Pressure can be changed while the sensor is running by an external device.
Even though the user should configure the sensor as upward or downward looking, the sensor detects automatically
6)
the orientation when it is in operation. It uses this orientation to calculate the correct North, East and Vertical speeds
and also for the calculation of correct compass heading, pitch and roll. If the sensor detects that it is upside down
(while configured upward looking and surface referred), the surface cell parameters are set to zero and the parameter
status codes returns a "not valid error". If one of the columns is set to surface reference, the column is forced to be
instrument referred. If the sensor is configured to be upside down but measures that it is orientated upward looking, both
surface cell and surface reference will work if enabled. The 'record status' (in the output data) will indicate in the first bit
(32-bit where 32 flags indicates different statuses) with a '1' if there is a mismatch between the upside down setting and
the orientation measured by the sensor (binary bits xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx1, where x are the other bits
indicating other statuses).
The fixed heading value here is the angle in degrees between north direction and transducer 1 (clockwise) – Refer
7)
Figure 6-2. When viewing the sensor from the front (label side) transducer 1 is to the left on the rear side. If for example
transducer 1 is 118° clockwise from north, the fixed heading should be set to 118°. The fixed heading is a value
between 0 and 360 (0 and 360 is the same point).
July 2019 – TD 304 OPERATING MANUAL – Doppler Current Profiler Sensor
A list of all available Heading parameters with Deg.M as unit is
1 shown in the dropdown menu. Make sure that the correct
heading parameter is selected. Only in AiCaP mode.
Offset added to the AiCaP external heading. Only in AiCaP
1
mode.
http://www.ngdc.noaa.gov/geomag-web/
No/
DS
Low
.
1)