innomar SBP smart - How Can I Reduce Acoustic Interference with MBES; What Is the Difference between the Innomar Data Formats

154 User’s Manual INNOMAR Parametric Sub-Bottom Profilers / SESWIN
154 Innomar Technologie GmbH (2023-01)
13.1.5 How can I reduce acoustic interference with MBES?
Q: In my multibeam data I see artefacts caused by acoustic interference from the Innomar
SBP. How can I avoid or reduce this interference?
Interference is usually caused by the INNOMAR primary (HF, ~100 kHz) frequencies or its
harmonics (~200 kHz, ~300 kHz, ~400 kHz). To reduce acoustic interference, you can
 synchronize the systems to have dedicated time slots, see section 6 on page 81,
 use another frequency for the MBES (many newer models can tune the operating
frequency), a good frequency would for instance around 360 kHz,
 increase the MBES transmit power,
 use the MBES in chirp mode,
 use and adapt gates for the MBES bottom track.
13.1.6 What is the difference between the Innomar data formats?
Q1: My SESWIN support SES and RAW data, what format should I use?
Q2: My SESWIN records SES3 data, what is the difference to SES and RAW data?
Q3: How many data is collected and which file size can be expected?
There are three data formats used with the INNOMAR sub-bottom profilers:
SES RAW SES3
Number of Channels 2 2 2 ... 80
Bits 16 16 24 / 16
Sample rate Depends on range Full Full
Samples per trace 480 Depends on range Depends on range
Waveform Processed
(magnitude only)
Full raw data
(magnitude + phase)
Full raw data
(magnitude + phase)
Post-Processing INNOMAR ISE 2.x
INNOMAR SESConvert
INNOMAR ISE 2.x
INNOMAR SESConvert
INNOMAR ISE 3.x
INNOMAR SESConvert
Notes Due to the range-de-
pendent sample rate,
the resolution is lower
than for RAW and
SES3 formats.
Full sample resolution;
mostly better than for
SES data.
Sample resolution like
for RAW data, but
higher dynamic range.
Supports multi-channel
data.
File Size Estimate
in MB/hour

≈
7
.
5


≈
(
1
.
1
+
1
.
8

)


≈
(
1
.
7
+
2
.
7

)

The file size () depends on ping rate () and recording range length (). The ping rate
depends on range start () and range length (). Please note that the sum of range start and
range length gives the range end (=  + ). At normal internal trigger the ping rate is:
≈
750
 +  + 7.5
At external trigger the ping rate is lower and defined by the trigger period. The actual file size is
limited by the value set up in the “System Setup – General – Files“ menu.
!
The SES format should not be used for new projects because of the limited resolution,
especially at longer ranges. Use the RAW or the SES3 format instead.
The SES file format is obsolete and not supported since SESWIN 2.2.3.8.
The SES3 data format is not supported by all INNOMAR systems yet, but by “quattro” / “sixpack”
and new “standard” / “medium-xx” / “deep-xx” models. For SES3 data you have to use the
“seswin24bit.exe”.
For more information on the different INNOMAR data formats see appendix A.17 on page 211.
For older systems with SES and RAW formats, please enable RAW data recording: