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SES 2000 User’s Guide
143
The range-related setting will automatically adapt the delay according to changed water
depth. In this case the interference will be in a constant distance to the MBES seafloor.
Please note that range-related trigger delay is given relative to the range centre. In the
example given above range is 80-140m; range centre is 110m and 80ms (60m) delay equal
55% of range.
To get two SBP pings within one MBES cycle set “number of pings in one sync pulse” to “2” in
the SES-2000 synchronisation settings. The number of pings should not be higher than the
number of SBP cycles fit into one MBES cycle. Otherwise the pulse train is generated at each
recognized trigger event as explained in section 6.2.2 on page 101. This may result in
increased interference with the MBES.
The following table summarizes calculations and system settings for different water depths.
For all examples a MBES swath of 130° (like Reson SeaBat 7125) and a water depth of
±10% around the given mean is assumed, like in the example above.
All calculations based on smallest possible range for the MBES for the given water depth. If
the actually used range is larger or the MBES head is tilted (dual-head system), maybe more
than one SBP ping would fit into one MBES cycle.
To get best results, keep in mind to use smallest possible range length at the SES-2000 SBP.
Water depth
MBES bottom return
MBES centre swath
MBES max. ping rate
MBES max. ping rate
SES-2000 range start
SES-2000 range length
SES-2000 range end
SES-2000 bottom return
max. SES-2000 ping rate
max. SES-2000 ping rate
Trigger delay
Trigger delay rel. range
Pings for one sync pulse
(m)
(ms)
(ms)
(ms)
(Hz)
(m)
(m)
(ms)
(ms)
(ms)
(Hz)
(ms)
(%)
10
12-35
12-17
50
20
8
15
30
12-15
40
25
8
40
1
20
24-70
24-35
85
11
16
20
48
24-30
60
17
16
46
1
100
120-350
120-170
370
2.7
80
60
140
120-150
200
5
80
55
1
How to maintain optimal values at changing water depth is shown in section 7.13.4 on page
146.
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