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Introduce about the underwater acoustics and sonar operator laboratory

The acoustic systems trainer

Image 1: The acoustic systems trainer included: AST Console and Acoustic Tank with Target Transport System

SONAR is the underwater equivalent of radar, and like radar its functions are many and varied but are used under water. These include the detection, identification, location and speed indication of 'targets of interest'. There are basically two sonar modes of operation, 'Passive' (receiving or listening) and 'Active' (transmitting and receiving).

The acoustic systems trainer AST was developed for the purpose of training and research. This system has been used in many Navy schools in the world, to provide to students the practice exercises for more understanding about the theory of sonar and underwater acoustics signal, included:

  • Speed of sound in water
  • Temperature effects on the speed of sound.
  • The single element Transducer
  • Transducer resonant frequency
  • Two-element array
  • Transducer beam width
  • Passive SONAR
  • Active SONAR
  • CT-FM SONAR
  • Parametric SONAR  
  • Depth finding
  • The Doppler Effect
  • Underwater communications
  • Active target profiles
  • Passive target FFT signatures
  • Shallow water backscatter
  • Beam formation
  • Beam steering
  • Volume scattering & cavitation
  • Dielectric phase shift
  • ASW and Stealth

Image 2: The navy schools was used the AST systems

System included:

AST Console

 

Acoustic Tank

Rack mounting enclosure 19" / 48cm with handles

 

Acrylic - 12 and 15mm thickness

110 / 220 / 240 Volts 50/60~ @ 2 amps

 

Length 1,200mm

USB2 connector to PC

 

Width 600mm

0-12 volts/+5 v/-5/+15v/-15v D.C.

 

Depth 600mm

TX CW @ 200 kHz - CAL/VAR

 

Heater with thermostat - 3kW

PRF @ 714Hz - CAL/VAR

 

Int/Ext Digital Thermometer

PW @ 100µsecs - CAL/VAR

 

Stainless steel frame

TX PULSE Gated 100µsecs ~ 20CW cycles

 

Transport System and transducer guide rails

TX2, TX3 Fixed and Variable Phase O/Ps

 

Sonar Signal analyzer

SYNC pulse 5v - positive polarity

 

12,14,16 bits Resolution ~ 500Ms/sec

Echo Threshold control

 

2 Channel operation + Math functions

Target Transport System

 

Storage Oscilloscope 100nsec - 600sec/div

0-12 Volts speed controlled

 

Averaging 1 - 256

Auto/Manual reversing

 

Phase Measurement

Direct traction drive

 

Spectrum Analyzer .001Hz - 50MHz

Sliding Target Rails

 

AM/FM/FSK Modulation~ Sweep

Reversing sensors

 

Transient Recorder >30,000 points ~ 750 days

Targets

 

Voltmeters - 6 programmable

Active

 

Arbitrary Waveform Generator 1µHz - 30MHz

SS Flat plate 20cm sq

 

Transducers

SS Flat plate 10cm sq

 

200 kHzresonant frequency

SS Grill plate 10cm sq

 

8°~16° beam width @ -3dBs

Acrylic Flat Plate 20cm sq

 

Conical beam shape

Passive

 

Epoxy resin encapsulation

Variable speed passive-

 

2.5" / 6cm diameter pod

Three bladed prop

 

BNC connector coaxial cable

Four bladed prop

 

Reversible operation

Five bladed prop

 

Orientation - vertical or horizontal

PT Vari-speed Motor ~Gearbox

 

3 Transducers supplied

Source: RSI

Others

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