ATLAS North America Proprietary
Sea Scan ARC Scout MKII Operations Manual
1 of 1
Page: 49
Issue: 1.2.4
SCTM2-OPS
Operations Manual
7.1.3.2.2 Automatic Samples Per Channel
The Scout MkII side scan sonar system sets the Samples Per Channel automatically. It adjusts the samples
based on the number of active channels and the ping rate. It maintains a constant data rate of
approximately 425 kBytes per second yielding higher samples per channel at longer ranges (due to reduced
ping rate) and lower samples per channel at lower ranges.
7.1.3.3
Navigation Data Packet
The navigation data packet allows the storage of navigation data. This navigation data is strictly
geographically defined using standard latitude/longitude coordinates. The navigation data payload
structure is listed below. Any invalid or unknown values must be set to 99999.99. This insures that a
program reading the SDS will know that the value is invalid and should not be used.
Element
Variable Type
Description
wSource
WORD
Origin of this navigation data. The
Scout MkII sets this to
DATASOURCE_SONAR.
dLatitude
double
The latitude encoded as decimal
degrees.
dLongitude
double
The longitude encoded as decimal
degrees.
fCOG
float
The course over ground in degrees.
(Stored as TRUE not magnetic)
fHeading
float
The heading in degrees (Stored as TRUE
not magnetic)
fSOG
float
The speed over ground in meters per
second.
7.1.3.4
Orientation Data Packet
The Orientation data packet stores orientation information about the sonar. The position and orientation
information is to be referenced from the center of the Scout MkII's transducers and describes the
orientation and position of the sonar and sensors located in the data collection platform. The current
Embedded system firmware only uses the wSource, fRoll, and fPitch data fields. The other sources will be
set to the invalid floating point value (99999.99).
Element
Variable Type
Description
wSource
WORD
This is the origin of the navigation data
which this packet adds to. The Scout
MkII sets this to DATASOURCE_SONAR.
fX
float
X Offset in meters form the origin.
fY
float
Y Offset in meters form the origin.
fZ
float
Z Offset in meters from the origin.
fRoll
float
Roll in degrees.
fPitch
float
Pitch in degrees
fYaw
float
Yaw in degrees.