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TOPAS - Technical specifications

Technical specifications and comparison between Topas PS 18, PS 40 and PS 120 sub bottom profiler systems:

 

TOPAS PS 18

TOPAS PS 40

TOPAS PS 120

Operating principle
Parametric
Parametric
Parametric
Frequency range
- secondary (difference)
- primary
- harmonic (sum)

0.5 -  6 kHz /
15 - 21 kHz /
30 - 42 kHz

1 - 10 kHz /
35 - 45 kHz /
70 - 90 kHz

2-30 kHz/
70-100 kHz
Source level
- secondary (difference)
- primary
- harmonic (sum)

208 dB
242 dB
225 dB

206 dB
240 dB

202 dB
238 dB
Signatures
CW
Ricker
LFM
HFM
User defined
CW
Ricker
LFM
HFM
User defined
CW
Ricker
LFM
HFM
User defined
Pulse length
0.2 – 100 ms
0.1 – 100 ms
0.04 – 30 ms
Ping rates (max)
10 Hz
20 Hz
40 Hz
Penetration capability (depending on sediments)
> 200 meters
> 80 meters
> 50 meters
Water depth
10 meters to full ocean depth
5 to > 1000 metres
3 to > 400 metres
Heave compensated
Yes
Yes
Yes
Pitch compensated
Yes
Yes
Yes
Roll compensated
Yes
Yes
Yes
Transmit transducer
1.1 x 1.1 m
0.5 x 0.8 m
0.3 x 0.4 m
Receive transducer
, optional EM 122 receiver array
Same as transmit or separate hydrophone
Same as transmit
Beam forming principle
On transmit
On transmit
On transmit
Beam steering sector
-40 to +40 deg.
-40 to +40 deg.
-12 to +12 deg.
No of simultaneous beams
1
1
1
Fan of beams
Sequential scanning
Sequential scanning
Sequential scanning
Horizontal resolution
< 5 x 5 deg.
< 4 x 6 deg.
< 4 x 6 deg.
Side lobe structure
No side lobes
No side lobes
No side lobes
Vertical resolution
< 20 cm (< 0.25 ms)
< 10 cm (< 0.15 ms)
< 4 cm (< 0.05 ms)
Range resolution
0.5 – 4 cm (depending on sampling frequency)
0.5 – 4 cm (depending on sampling frequency)
0.4 – 2 cm (depending on sampling frequency)
Bottom detection
- Built-in or
- External depth
- Built-in or
- External depth
- Built-in or
- External depth
External trig and blanking etc.
Yes
Yes
Yes
Transmission pattern optimized for EM timing
Yes, if synchronized
Yes, if synchronized
Yes, if synchronized
Terrain adapted beam steering
Internal auto pitch or
External slope input
 
Internal auto pitch (optional)
External slope input
Internal auto pitch
External slope input
 
Audible noise inside hull
None
None
None
Operational
Stand-alone system
Remote operation
Slave displays
Stand-alone system
Remote operation
Slave displays
Stand-alone system
Remote operation
Slave displays
Processing functions
Filtering:
- Bandpass
- Matched
- Spiking
Time Variable Filter (TVF)
Bottom tracking:
- Internal
- External
Mute
Swell filter
Dereverberation
Stacking / Trace mixing
Synthetic aperture processing
Time Variable Gain (TVG)
Automatic Gain Control (AGC)
Attribute processing
Gain:
- Automatic
- Manual
Ping statistics
Filtering:
- Bandpass
- Matched
- Spiking
Time Variable Filter (TVF)
Bottom tracking:
- Internal
- External
Mute
Swell filter
Dereverberation
Stacking / Trace mixing
Synthetic aperture processing
Time Variable Gain (TVG)
Automatic Gain Control (AGC)
Attribute processing
Gain:
- Automatic
- Manual
Ping statistics
Filtering:
- Bandpass
- Matched
- Spiking
Time Variable Filter (TVF)
Bottom tracking:
- Internal
- External
Mute
Swell filter
Dereverberation
Stacking / Trace mixing
Synthetic aperture processing
Time Variable Gain (TVG)
Automatic Gain Control (AGC)
Attribute processing
Gain:
- Automatic
- Manual
Ping statistics
Advantages
- Compact system, small transducer taking up little space
- Easy to install.
- Three frequency bands within the same acoustic pulse.
- No audible noise inside vessel
- Compact system, small transducer taking up little space
- Easy to install.
- Hull or over-the-side mounted.
- Three frequency bands within the same acoustic pulse.
- Portable system, small transducer taking up little space
- Easy to install.
- Over-the-side or hull mounted
Applications
- Research (geophysical/ geotechnical)
- Site surveys
- Route surveys (pipe & cable)
- Resource mapping
- Environmental monitoring
- Fishery research
- Object detection / characterization
- Sediment characterization
- Military applications (MCM, propagation studies, etc.)
- Site surveys
- Route surveys (pipe & cable)
- Resource mapping
- Environmental monitoring
- Object detection/ characterization
- Sediment characterisation
- Military applications (MCM, classification, etc.)
- Site surveys
- Route surveys (pipe & cable)
- Resource mapping
- Environmental monitoring
- Object detection/ characterization
- Sediment characterisation
- Military applications (MCM, classification, etc.)

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