Hydroacoustic Technology, Inc.
  Hydroacoustic Technology, Inc.    
 
  Echo Sounders: Multi-Frequency Systems  
 
Multi-Frequency Echo Sounder
Model 244 Multi-Frequency Echo Sounder Spec Sheet

> Model 244 Multi-Frequency Echo Sounder

 

The Model 244 Multi-Frequency System is a dynamic, digital split-beam and single-beam hydroacoustic system. Combining powerful digital signal processing hardware with a Windows 7 & Windows 8-based user interface, the Model 244 System produces results in real-time, with multiple data display and storage options.

  Key Features of the Model 244 Multi-Frequency Echo Sounder
 
Samples up to 16 transducers of up to 5 different frequencies from 38 kHz to 1 Mhz.
Samples up to 16 transducers of up to 5 different frequencies from 38 kHz to 1 MHz.
High resolution: up to 1400 range strata as small as 10 cm
High resolution: up to 1400 range strata as small as
10 cm, summary data available as frequently as
every 6 sec, and ping rate up to 50 pings/sec.
FM slide/chirp signals provide up to a 15 dB gain in signal-to-noise ratio
FM slide/chirp signals provide up to a 15 dB gain in signal-to-noise ratio, reducing bias and variability in resulting fish target strength and biomass estimates.
Records the complete raw unthresholded, digital samples.
Records the complete raw unthresholded, digital samples.
System Advantages of HTI Hydroacoustics
Deep Tow Multi-Frequency System
Spec Sheet

> Model 244 Deep Tow
   Multi-Frequency System

 
 

The Model 244 Deep Tow Multi-Frequency System is a robust, digital split-beam/single-beam hydroacoustic system designed to be towed up to 1000 m (3280 ft) deep. Combining powerful digital processing hardware with a Windows 7 and Windows 8 user interface, it is ideal for deep ocean fisheries and plankton research [originally developed for Woods Hole Oceanographic Institute (WHOI) plankton studies].

Learn more about WHOI plankton studies, at "Biomaper-II: An integrated instrument platform for coupled biological and physical measurements in coastal and oceanic regimes", 2002 Wiebe, P.H., T.K. Stanton, C.H. Greene, M.C. Benfield, H.M. Sosik, T. Austin, J.D. Warren, and T. Hammar, “ ,” IEEE J. Ocean. Eng. 27, 700-716.

  Key Features of Model 244 Deep Tow Multi-Frequency Hydroacoustic System  
Rated to 1000 m (3280 ft) deep.

Rated to 1000 m (3280 ft) deep.

Samples up to 16 split-beam or single-beam transducers operating at up to 5 different frequencies
Samples up to 16 split-beam or single-beam transducers operating at up to 5 different frequencies between 38 kHz and 1 MHz.
Either slow (timed) or fast multiplex (alternating pings) sampling among transducers.
Either slow (timed) or fast multiplex (alternating pings) sampling among transducers.
High resolution: up to 1400 range strata as small as 10 cm, summary data available as frequently as every 6 sec

High resolution: up to 1400 range strata as small as 10 cm, summary data available as frequently as every 6 sec, and ping rate up to 50 pings/sec.

FM slide/chirp signals provide up to a 15 dB gain in signal-to-noise ratio, reducing bias and variability in resulting fish target strength and biomass estimates.
System Advantages of HTI Hydroacoustics
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> Multi-Frequency Systems
> Deep Tow Systems
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Benefits of FM Slide for Echo Sounders
 
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