BENEFITS
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- Longer ranges due to improved SNR
- Less interference from side lobes due to the frequency modulated pulse.
- Dual frequency simultaneous (example 120 & 410 kHz) pulses
- Low frequency range is up to 30% greater than conventional systems at the same frequency.
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- High frequency range is up to 50% greater than conventional systems at the same frequency.
- Narrow-beam side scan sonar transducers result in sharp, high-resolution along-track sonar imagery.
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DESCRIPTION
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EdgeTech’s Deep Water Full Spectrum “chirp”
side scan sonar is a calibrated wide band digital FM sonar that
provides quantitative and qualitative, high-resolution, low-noise
side scan imagery. It simultaneously transmits linearly swept
FM pulses centered at 2 discrete frequencies. A number of center
frequency options are available. The transmission of a longer
duration, wide bandwidth pulse result in higher resolution sonar
images and, because more energy is projected into the water, greater
SNR resulting in extended range.
An important feature of Full Spectrum side
scan sonar is the reduction of side lobes in the effective transducer
aperture. The wide band and linearity of the FM sweep smears the
side lobes of the transducer and thus achieves a beam pattern
with virtually no side lobes. Three frequency set options are
offered: 75 and 410 kHz, 120 and 410 kHz, or 75 and 120 kHz dual
simultaneous. The Series 2400 can be installed on an EdgeTech
or customer supplied Towed Vehicle, on an ROV or an AUV/UUV.
TOWED
High-frequency, high-resolution operation of conventional analog
systems is restricted to shallow water depths due to cable length
restrictions. EdgeTech’s Deep-Tow Side Scan Sonar uses digital-communication
technologies to provide high-resolution images at depths that
surpass those of analog systems. As an added benefit, only a single
coaxial tow cable is required.
The tow vehicle contains a dual frequency side
scan, optional sensors, and all of the Full Spectrum chirp electronics
required to generate and then transmit, receive and process the
Full Spectrum “chirp” sonar signals. Sonar and other data are
transmitted to the surface via StarMux where a PC based data acquisition,
storage, and printing processor running DISCOVER Side Scan Sonar
software is the user interface to the underwater portion of the
system.
Typical System Configuration
- Model TV-D or DT-1 towfish with room for
optional sensors.
- Dual frequency Chirp side scan sonar arrays.
- Model FS-DW underwater Full Spectrum Chirp processor.
- StarMux Digital Link and Power for use on a coax tow cable.
- Model 2400 Topside sonar display processor
hardware.
- DISCOVER Software for display storage and printing of sonar data.
- Optional integration (mechanical/power/data)
of sensors such as motion, heading, depth, altitude, navigation,
multi-beam echo sounder, magnetometer etc.
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ROV
EdgeTech’s Deep Water Side Scan Sonar can be installed on a variety of ROVs. A modular system is provided as a complete package including sensors and pressure vessel. Alternatively, it can be integrated into the ROV systems. For example, the ROV can provide power and a 2-way digital link to the surface. It can also provide a pressure housing for the underwater electronics.
Typical System Configuration
- Dual frequency Chirp side scan sonar arrays.
- Model FS-DW underwater Full Spectrum Chirp processor.
- Optional StarMux Digital Link and power
- Model 2400 Topside Sonar Display Processor
- DISCOVER Software for display storage and printing of sonar data.
- Optional integration (mechanical/power/data)
of sensors such as motion, heading, depth, altitude, navigation,
multi-beam echo sounder, magnetometer etc
AUV
The deep-water side scan sonar has been especially designed for installation on an Autonomous Underwater Vehicle(AUV) or on an Un-tethered Underwater Vehicle (UUV). Low power electronics and techniques such as turning off the amplifier and turning the power down if not needed are used to reduce the power consumption. The ability to accurately set and monitor the real time clock keeps the side scan data synchronized with navigation and other sensor data on the AUV.
A modular system is provided as a complete package including sensors and pressure vessel. Alternatively, it can be integrated into the AUV pressure housing. The system can operate independent of the AUV by setting parameters before deployment, or an AUV payload controller can command, control and store the side scan data. A second decimated simultaneous data stream can be fed into an acoustic link so that real time side scan data can be displayed on the surface.
Post mission side scan sonar data can be offloaded
to the Model 2400Topside Display Processor running EdgeTech’s
DISCOVER Side Scan Sonar software. Here the sonar data can be
replayed on the video monitor and printed.
Typical System Configuration
- Dual frequency Chirp side scan sonar arrays.
- Model FS-AU Full Spectrum “chirp” processor.
- Model 2400 Topside Sonar Display Processor.
- DISCOVER Software for display storage and printing of sonar data.
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| How to Configure a System |
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OPTION |
ANSWER |
- 1. Deployment type?
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- Towed
- AUV
- ROV
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- 2. If towed which tow vehicle?
- TV-D
- DT-1
- Customer Supplied
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- 3. Which Frequency?
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- 75/120 kHz
- 75/410 kHz
- 120/410kHz
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4. Which Options?
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- 5. If ROV, is the digital link to the surface?
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- StarMux (use FS-DW)
- Supplied by ROV (use FS-AU)
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- 6. If ROV is the power?
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- From StarMux (use FS-DW)
- Supplied by ROV (use FS-AU)
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- 7. If required, which pressure housing?
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- 1500 m.
- 3000 m.
- 6000 m.
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- 8. Does EdgeTech supply the
Topside Display Processor?
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- if YES, use Model 2400
with DISCOVER
- If NO, use FS-IU
(Full Spectrum Interface Unit)
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P E C I F I C A
T I O N S |
| Frequency |
75 & 120 kHz |
75 & 410 kHz |
120 & 410 kHz |
| Modulation |
Full
Spectrum "chirp" frequency modulation pulse
with
amplitude and phase weighting |
| Array Depression Angle |
10° to 20° from horizontal, adjustable |
Array Size
Length
Width
Depth |
99 cm (39”)
7 cm (2.75”)
7.6 cm (3”) |
99 cm (39”)
7 cm (2.75”)
7.6 cm (3”) |
78 cm (31”)
7.6 cm (3”)
3.8 cm (1.5”) |
| Array Weight (in air) |
16 kg (36.5 lbs) |
16 kg (36.5 lbs) |
7.3 kg (16 lbs) |
| Array Weight (in sea water) |
11.6 kg (25.6 lbs) |
11.6 kg (25.6 lbs) |
5 kg (11 lbs) |
| Time Sync In - Hardware |
TTL level, minimum 5 µs pulse, triggers on negative edge, normally 1 PPS |
| Time Sync In - Software |
Via Ethernet port, 10 ms accuracy |
| Trigger In - Software |
Via Ethernet port, 10 ms accuracy |
| Triggers Hardware |
3 Programmable in/out TTL levels |
| Trigger Types |
Internal, External, Coupled, Gated |
| Attitude Sensor Option |
Heading Accuracy: < 1.5° RMS
Heading Resolution: 0.1°
Roll, Pitch Angle Accuracy: ± 0.4°
Roll, Pitch Angle Repeatability: 0.2°
Roll, Pitch Resolution: 0.1° |
| Options |
USBL Acoustic Tracking System
RS-232 Ports (4 or 6) bi-directional 19.2K Baud
Power Out 12, 24, 48 or 400 VDC 400 watts
Local Mass Storage
Most Customer Specified Sensors |
| Frequency |
75 kHz |
120 kHz |
410 kHz |
| Swath (Minimum/Maximum) |
50/1200 meters |
50/800 meters |
25/300 meters |
| Range Resolution (cm) |
10 |
6.25 |
1.9 |
| Horizontal Beam Width 3 dB (1-way / 2-way) |
1.2° / 0.9° |
1.2°/ 0.9° |
0.75°/ 0.6° |
| Vertical Beam Width |
70° |
| Depth Rating |
6000 meters |
| Towed Version |
Model TV-D |
Model DT-1 |
| Depth Rating |
1500, 3000, 6000 meters (other depths optional) |
| Height |
55 cm (21.6”) |
104 cm (41”) |
| Length |
226 cm (89”) |
305 cm (120”) |
| Width |
81 cm (31.8”) |
92 cm (36”) |
| Weight in Air (approximate) |
250 kg (550 lbs.) |
910 kg. (2000 lbs.) |
| Weight in Saltwater (approximate) |
137 kg (300 lbs.) |
Positively Buoyant (20 kg, 45 lbs.) |
| Options |
Depressor, 50-Meter Umbilical, Emergency Recovery System
(Acoustic Release, RDF, Strobe Light) |
| AUV/UUV Version (Model FS-AU Full Spectrum Processor) |
| Housing Depth Rating |
300, 1000, 1500, 3000, 6000 meters (other depths optional) |
300 Meter Housing
Size
Weight in Air
Weight in Salt Water |
OD: 19 cm (7.5”) Length: 57.5 cm (22.6”)
17.8 kg (39.3 lbs.)
1.9 kg (4.2 lbs.)
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1000 Meter Housing
Size
Weight in Air
Weight in Salt Water
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OD: 19.6 cm (7.7”) Length: 58.7 cm (23.1”)
21.8 kg (48 lbs.)
1.6 kg (3.5 lbs.)
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3000 Meter Housing
Size
Weight in Air
Weight in Salt Water
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OD: 22.6 cm (8.9”) Length: 61 cm (24”)
32.8 kg (72.4 lbs.)
7.8 kg (17.2 lbs.)
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| STARMUX Digital Link |
| Tow Cable Length (Maximum) |
10,000 meters Coaxial, no limit on Fiber Optics |
| Tow Cable Type |
Coaxial or Fiber Optics |
Physical Surface Module
Size
Weight
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3U
7.0 kg (15.4 lbs.) |
| Trigger FSK for Responder |
TTL Level, < 10µs jitter |
| Power |
105-230 VAC auto sensing, 50-60 Hz |
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P T I O N A L C O N F I G U R A T I O N |
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