龍亭企業有限公司 -- 海洋測量硬體
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The EM 3002 is a new advanced multibeam echo sounder with extremely high resolution and dynamically focused beams. It is very well suited for detailed seafloor mapping and inspection with water depths from less than 1 meter up to typically 200 meters in cold oceanic conditions. Maximum depth capability is strongly dependant on water temperature and salinity - up to 300 meters is possible under favorable conditions.
Due to its electronic pitch compensation system and roll stabilized beams, the system performance is stable also in foul weather conditions.The spacing between soundings as well as the acoustic footprints can be set nearly constant over the swath in order to provide a uniform and high detection and mapping performance. Dynamic focusing of all receive beams optimizes the system performance and resolution for short range applications such as underwater inspections.
Typical applications
• Mapping of harbours, inland waterways and shipping channels with critical keel
   clearance
• Inspection of underwater infrastructure
• Detection and mapping of debris and other under-water objects
• Detailed surveys related to underwater construction work or dredging
• Environmental seabed and habitat mapping
• Mapping of biomass in the water column
Features
The EM 3002 system uses frequencies in the 300 kHz band. This is an ideal frequency for shallow water applications, as the high frequency ensures narrow beams with small physical dimensions. At the same time, 300 kHz secures a high maximum range capability and robustness under conditions with high contents of particles in the water.EM 3002 uses a powerful sonar processor unit in combination with 1 or 2 compact sonar heads. The high computing power of the EM 3002 sonar processor makes it possible to apply sophisticated and exact signal processing algorithms for beam forming, beam stabilization, and bottom detection. In High Density processing mode the system has close to uniform acoustic footprints and resolution over the whole swath width, and therefore a much improved capability to detect objects and other details on the bottom. EM 3002 will in addition to bathymetric soundings, produce an acoustic image of the seabed. The image is obtained by combining the acoustic return signals inside each beam, thus improving signal to noise ratio considerably, as well as eliminating several artifacts related to conventional sidescan sonars. The acoustic
image is compensated for the transmission source level, receiver sensitivity and signal attenuation in the water column, so that reliable bottom backscatter levels in dB are obtained. The image is also compensated for acoustic ray bending, and thus completely geo-referenced, so that preparation of a sonar mosaic for a survey area based upon data from several survey lines is easy. Objects observed on the seabed image are correctly located and their positions can be readily derived.
EM 3002 Specifications

Frequencies. ...............................................................................................293, 300, 307 kHz
Number of soundings per ping:
Single sonar head. .....................................................................................................Max 254
Dual sonar heads. .....................................................................................................Max 508
Maximum ping rate. .......................................................................................................40 Hz
Maximum angular coverage:
Single sonar head. ...............................................................................................130 degrees
Dual sonar heads. ................................................................................................200 degrees
Pitch stabilisation. ............................................................................................................Yes
Roll stabilisation. ..............................................................................................................Yes
Heave compensation. .......................................................................................................Yes
Pulse length. ...............................................................................................................150 μs
Range sampling rate. ...................................................................................14, 14.3, 14.6 kHz
Depth resolution. ............................................................................................................1 cm
Transducer geometry. .............................................................................................Mills cross
Beam spacing. .................................................................................Equidistant or equiangular
Beamforming:
• Time delay with shading
• Dynamically focused receive beams
Seabed image data
• Composed from beamformed signal amplitudes
• Range resolution 5 cm.
• Compensated for source level and receiver sensitivity,
as well as attenuation and spherical spreading in the water column.
• Amplitude resolution: 0.5 dB.
External sensors
• Position
• Heading
• Motion sensor (Pitch, roll and heave)
• Sound velocity profile
• Sound velocity at transducer.
• Clock synchronisation (1 PPS)
Environmental and EMC specifications
The system meets all requirements of the IACS E10 specification.The Operator Station, LCD monitor and Processing Unit are all IP22 rated.
Dimensions and weights
Sonar head:
Shape. ...................................................................................................................Cylindrical
Housing material. .......................................................................................................Titanium
Diameter. ..................................................................................................................332 mm
Height. ......................................................................................................................119 mm
Weight. ...........................................................................................25 kg in air, 15 kg in water
Pressure rating. .....................................................................................500 m (1500 m option)
transducer cable length. ..................................................................................................15 m
Sonar Processing Unit:
Width. .......................................................................................................................427 mm
Depth. .......................................................................................................................392 mm
Height. ......................................................................................................................177 mm
Weight. ......................................................................................................................14.5 kg
Operator Station:
Width. .......................................................................................................................427 mm
Depth. .......................................................................................................................480 mm
Height. ......................................................................................................................127 mm
Weight. .........................................................................................................................20 kg
　

　

　

海測硬體-右邊選單(繁體)
　
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