BATHY 2000

The BATHY-2000 is manufactured by:

Ocean Data Equipment Corp. (ODEC)
Fall River, MA

Introduction

The BATHY-2000 system provides high performance bathymetric survey and sub-bottom profiling capability. The system configuration is extremely flexible and can be easily modified to accommodate the specific needs of individual customers.

R/V Thompson Configuration:

System Overview

The following paragraphs will provide an overview of individual system components. Each BATHY-2000 system component has been designed in such a manner as to emphasize performance and flexibility.

PDDD-2000 (Precision Display and Depth Digitizer)

The PDDD-2000 provides the main control, display and storage function for the BATHY-2000 system. The operators interface is a large high resolution, sixteen color monitor and full keyboard. The operational display provides integrated sounding data and programming menu. It is capable of fully automatic as well as manual operation. The PDDD-2000 provides a hardcopy interface via a parallel port to a 16 level gray scale thermal recorder. The system is capable of real time display of sounding information as well as simultaneous depth digitizing, hardcopy and digital storage. A SCSI interface to a 1 Gigabyte WORM drive is available to store time/position tagged sounding data for a comprehensive digital record of the vessel's survey mission.

The PDDD-2000 is packaged within a sealed/ruggedized 19-inch rack mount enclosure. The main processing elements are two embedded 80486 microprocessors. One CPU handles serial I/O while the other handles data acquisition and processing. The PDDD-2000 receives processed data from the CESP IV via an IEEE-488 interface, depth digitizes and processes the data so that it can be displayed and stored on optical disk.

CESP IV (Correlation Echo Signal Processor)

The CESP IV is the signal processing element of The BATHY-2000 system. It is packaged within a sealed 19 inch rack mount enclosure. The CESP IV design utilizes an extremely flexible/reprogrammable DSP architecture. This benefits the user by allowing him the ability to alter many of the CESP IV transmit/receive signal processing characteristics. For example, the user may select between linear FM or CW pulse modes of operation. In the linear FM mode of operation the user may select sweep bandwidths of 1 KHz, 2 KHz and 4 Khz. The user may also select between FM sweep durations of 25, 50 and 100 ms. CW pulse mode of operation allows for various pulse durations with matching receiver bandwidths and waveform shapes.

Transmit signal synthesis provides modulation and pulse shaping capability as well as pre-distortion of replica waveform to equalize transducer effects. The analog front end provides AGC which expands the usable dynamic range of the unit to 144 dB. The signal processing hardware utilizes the latest technology including Intel's Pentium 4 processors.

LPT-5 (Linear Power Transmitter)

The LPT-5 is a five kilowatt 19 inch rack mounted linear power amplifier. It utilizes pulse width modulation switching technology. This topology of amplifier, digitally samples the input signal at greater than five times its own frequency with the resultant digital wave train being filtered to reconstruct the original signal at the amplifier output. This results in an efficiency rating of greater than 80% at full rated power. The operating duty cycle is 20% at full power with a 1-50 KHz frequency response. The LPT-5 offers greater than 70 dB operating dynamic range. It receives it's input waveform and control signals from the CESP IV via a ground isolated interface. A transmit/receive switch allows for complete isolation of the amplifier output stage for low noise operation. The LPT-5 is totally protected against adverse loads, over temperature, out of band input signal and loss of primary power.

MOS-2000 (Mass Optical Storage Device)

The MOS-2000 optical storage device utilizes magneto optical drive technology to provide permanent storage of up to 1 Gigabyte. The storage media is removable and allows for portability between systems. The recording formats are flexible and allow for storage of all required survey information and data tagging. Stored sounding data is fully processed.

TR-109 (3.5 KHz Transducer)

The TR-109 is a 3.5 KHz transducer suitable for bathymetric and sub-bottom profiling applications. These transducers are generally assembled into an array of multiple elements to provide added power capability and achieve desired beam patterns. The transducer is rated at 200 watts continuous power and has a nominal impedance of 125 ohms. The 3.5 KHz transducer on the R/V Thompson is an array of 12 series/parallel wired TR-109 elements.

TC-12/34 (12.0/34 KHz Transducer)

The TC-12/34 is a dual frequency transducer capable of both 12 and 34 KHz operation suitable for bathymetric survey applications. It is rated at a maximum power level of 2000 watts at 12 KHz and 500 watts at 34 KHz.

Note: the BATHY 2000 system does not support 34 KHz operation.

Hardcopy Devices

The BATHY 2000 is capable of interfacing to a variety of industry standard hardcopy devices. The table below lists the devices and their performance characteristics.

R/V Thompson Configuration: