Gemini Narrow Beam Imager (NBI)
Narrow Beam Imaging
The Gemini NBI offers a narrow vertical beam and 130° swath. The Gemini NBI produces an acoustic image, cutting through the water with a narrow acoustic beam and at the high refresh rate users can expect from the Gemini range of multibeam sonars.
Tritech International ltd
Westhill, GB
Description
Based on the proven design of the Gemini 720i, the Gemini NBI uses a 1° vertical beam instead of the 20° vertical beam found on the 720i. This reduced beam width allows the user to more precisely identify the position of the acoustic targets than is possible with a wide beam imaging sonar which is commonly used for obstacle avoidance operations.
Operating at 620kHz the Gemini NBI is able to produce images with 10mm range resolution while the 0.5° horizontal angular resolution results in an extremely sharp sonar image. Where monitoring your position relative to a known target is the objective and not general obstacle avoidance, then the Gemini NBI can help guide you safely to the desired target.
The multibeam transducer design used for the Gemini NBI results in a 130° sector scan width and advanced technology allows update rates as high as 30 scans per second. With wide angle imaging and a high refresh rate the user is able to quickly and effectively manoeuvre to a target in poor visibility conditions.
Depth rated to 4000m and manufactured from titanium the Gemini NBI has been designed to work in the harshest of environments such as those typically found in subsea mining and excavation.
Specifications
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General
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Year of initial development
2014
Receive array length [m]
0
Receive array width [m]
0
Receive array height [m]
0
Transmit array length [m]
0
Transmit array width [m]
0
Transmit array height [m]
0
Receive array weight in air [kg]
0
Transmit array weight in air [kg]
14.6
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Sonar Details
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Max. depth [m]
4000
Min. frequency [kHz]
620
Max. frequency [kHz]
620
Typical range [m]
120
Minimal detectable range [m]
0.5
Max. number of beams
256
Min. horizontal beam width [deg]
0.5
Max. horizontal beam width [deg]
1
Min. vertical beam width [deg]
1
Max. vertical beam width [deg]
1
Min. pulse length [µs]
25
Max. pulse length [µs]
200
Max. update rate [Hz]
30
Range resolution [cm]
0.01
Min. DC power [V]
22
Max. DC power [V]
75
Min. AC power [V]
0
Max. AC power [V]
0
Max. power consumption [W]
37
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Data Processing
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Data processing software
Proprietary software and Tritech Seanet Pro software
Operating System
Windows 2000, Windows XP, Windows Vista, Windows 7
Minimal hardware requirements
0
Data storage capacity [Gb]
0
External data storage options
0
Interface options
Ethernet or VDSL
Motion correction
0
-
Other specifications
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Carrier options
AUV, fixed, ROV
Mount options
Pole mount or ROV fixed
Connector options
Burton 5506 Series
Main applications
ROV/AUV navigation; obstacle avoidance; target recognition; search and salvage
