Operational procedures
21
850-164692 / Rev.B
Data recording and playback
Background
You can set up the echo sounder to record unprocessed
transducer signals (sample data) and external sensor information
onto files. These files contain the necessary information to
reconstruct the situation during the real survey. The echo
sounder program reads these files during replay.
Recording
Preparations
The recording is prepared as follows.
1
Open the
Output
menu, and select
File
.
2
Observe the
Output File
dialogue open.
3
Select the tab
Directory
and push the
Browse
button if
you wish to change the direcory to which the files are
stored.
4
Press the
Raw Data
tab to define how the raw data is to
be recorded:
-
Save raw data:
Start/stop recording of raw data.
-
Range:
Select the depth range to be recorded. This
range, referring to the transducer face, is independent
of any other range settings in the echo sounder.
-
Echogram data:
This is user defined excerpts of the
processed sample data (pixel data), ie the backscatter
value of the targets. The echograms are stored as time
tagged datagrams in separate files.
5
If necessary, limit the maximum size of a single file.
- The current file will be closed and a new file will be
automatically generated when either the
Max vessel
distance
or the
Max. file size
limit is reached.
6
Click
OK
to exit the dialogue.
Start and stop recording
Use either the
Toolbar
buttons or the
Save raw data
check box
in the
File Output
dialogue to start or stop recording of data.
Note on size of stored raw data
The size of the raw data files stored depends on several user
selections. From these selections you may estimate
approximately the total amount of raw data stored in a given
time period for each installed channel using the following
equation:
X
=
B
bytes per sample *
(8*R)/(c*tau)
samples per ping *
M
ping per sec *
24
*
3600
sec per day
Summary of Contents for ER60
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