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Ocean Data News
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February 7th, 1999 |
Bathy-2000P Helping to construct the Japan
Information Highway
By Thomas B. Opishinski
Sea trials were successfully carried out
during June, 1998 on a trial cruise from Yokamaha, Japan to Tapei, Taiwan. During the sea
trial, the BATHY-2000P performed exceptionally well, providing
continuous, well-resolved, sub-bottom data to depths exceeding 6000m with greater than 150
meters penetration in some areas.
KDD (Japan's Global Communications) is presently constructing the
JIH (Japan Information Highway) cable, a large-capacity optical-fiber submarine cable that
will encircle the Japanese archipelago. JIH is designed to make Japan a hub of the
Asia-Pacific region and further improve the Japanese telecommunication infrastructure in
anticipation of the multimedia age.
The JIH cable will encircle Honshu,
Shikoku, and Kyushu islands, and will be landed at some 17 domestic locations including
Hokkaido and Okinawa. The total construction cost of this 10,300-km long cable is slated
to be 130,000 million Yen
During the cable laying operation it is imperative that the sea
floor slope, topography and geophysical properties are available to the operators aboard
the Pacific Link. The seafloor data provides information to guarantee safe burial of the
cable and, more importantly, aids in protecting the submerged cable-laying tractor from
damage or loss. KDD required a sub-bottom system capable of producing high-resolution
sub-bottom data in the first 3 meters of sediment strata and real-time calculations of sea
floor slope for this project. The BATHY-2000P was selected by
KDD because it provides 8 cm resolution and its ability to track the sea floor over rough
terrain. Ocean Data Equipment Corporation modified a standard BATHY-2000P
FM Chirp Sub-Bottom Profiler in order to provide real-time slope calculations during the
cable laying operation |
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In This Issue
- Bathy-2000P
- Sub-Bottom Chirp Profiler
- Helping to Construct the "JIH"
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- Bathy-1500
Dual Frequency Survey Echo Sounder
- Specification updates
Also, brochures for these systems
and others are available for download at our website.
www.oceandata.com
Previous Issues are available here:
www.oceandata.com/odecnews.htm
Direct Product Links:
Bathy-500MF
Multi Frequency Survey Echo Sounder
Bathy-1500
Dual Frequency Survey Echo Sounder
Bathy-2000P
Chirp Sub-Bottom Profiler
Bathy-2000W
Windows95® Post Processing Software
TDU-Series Thermal
Printers
8.5" to 20.0" greyscale recorders
Contact List:
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| A data sample, and more
information is available at http://www.oceandata.com/odecnewsvol1-5.htm. |
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Depth Ranges
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- Units of 0-5; 0-10; 0-20, 0-40:0-200; 0-400; 0-800;0 -
2000; 0 - 5000 Units.
- Manual and Auto ranging modes.
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Phasing
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Phase and Auto Phasing at depth
ranges of 400 units. Phase from 0-400, 200-600, 400-800, etc. up to 4600-5000 Units. |
Units
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Meters or Feet. |
Operating Modes
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Single or Interleaved Dual
Frequency |
Frequencies
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12 kHz; 24 kHz; 33 kHz; 40 kHz;
100 kHz; 200 kHz |
Resolution
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- 1 cm or .1ft <=99.9 units
- 10 cm or .5ft >99.9 units
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Accuracy
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- 0-40m -- ±2.5cm
- 40-200m -- ±5.0cm
- >200m -- ±10cm
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Audio Alarm
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User controlled audio alarm for
shallow water, deep water and bottom lost conditions. |
Alarm Contact Closure
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Relay contact, 120 VAC @ 0.5
Amps or 24 VDC @ 1.0 Amps (maximum). |
Sounding Rate
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Maximum 18Hz; depth range and
operating mode dependant. |
Transmit Power
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2 kilowatt (maximum) both
Channel 1 and Channel 2 |
Sound Velocity
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1400-1600 meters/second or
4595-5250 feet/second, user selectable in 1 unit increments. |
Depth from
Measurement
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Provides depth measurements in
the following modes: Depth Below Surface (DBS) or Depth Below Transducer (DBT). |
Data Output
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- NMEA0183 Version 1.5, 2.0 and 2.1 strings:
- (9600 or 19200 baud, string dependent, No parity, 8 bits, 1
Stop bit) DBT, DBS and DPT.
- ODEC proprietary serial strings-
- ODEC HEAVE, ODEC DEPTH, and ODEC BINARY for graph data
output.
- Backwards compatible outputs-
- ODOM DBT, ODOM SBT, ATLAS DESO 25.
- Jumper selectable RS-232 or RS-422.
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Data Input
COM 1
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- NMEA0183 Version 1.5, 2.0 and 2.1 strings:
- (4800, 9600 or 19200 baud, string dependent, No parity, 8
bits, 1 Stop bit)
- GLL, GGA, RMC, RMA, VTG, ZDA.
- ODEC Proprietary Annotation String Input ANN.
- Jumper selectable RS-232 or RS-422.
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Data Input
COM 2
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- Heave Input :
- TSS, TSS1 or Seatex SOUNDER format, variable input rates,
- 9600, or 19200 depth output string dependent.
- Remote Annotation, Remote Fix Mark (ODEC Proprietary or
ODOM compatible)
- External Synchronizatioin (sonar synch) and External
Control.
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Interference
Rejection (IR) Filter
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Removes ambient water column
noise and/or simultaneous transmissions from other acoustic systems within the frequency
bandwidth of operation. |
Graphic Display
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640 x 480 pixels; 16 grey
shades,Cold Cathode Flourescent Lighting ( CCFL) backlit flat panel display. |
Graphic Display Speed
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Off to 20> cm/min on LCD
Display. Off to >9 cm/min on TDU hardcopy output. |
Remote Display Output
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- Transmits proprietary serial string (4800, 9600 or 19200
baud, No parity, 8 bits, 1 Stop bit), RS-422.
- Power supplied via Bathy-1500 Main Unit.
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Internal Flash
Storage
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Stores at 1 second intervals,
resolution of digitized bottom depth and position, up to eight hours of operation. Stores
at 1 second intervals, up to 150 minutes of graph (acoustic return) data and position. |
External Mass (Disk) Storage
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Optional adapter cable; Enables
storage of all ASCII text data for depth, position, speed, course, annotation and
parameters and/or acoustic graph information through paralell port interface to a SCSI
compatible device. |
Printer Output
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Centronics (paralell port)
interface to TDU Series thermal grey scale recorder; selectable inkjet printers |
Input Power
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115 / 230 VAC (switch
selectable) 50 / 60 Hz; 60 Watts Niminal (80 Watts wtih three remotes attached). |
Dimensions
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39.4cm (15.5") width, 29.21
cm (11.5") height; and 21.59 cm (8.5") deep |
Weight
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10.7 kg (23.5 lbs.) |
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