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itp101

Mk.VIII. 2.85. www.itp101.com. NPL Transducer Polar Plot. (National Physical Laboratory). Acoustic Systems Trainer – SONAR R&D Platform. Main Menu. S ONAR S ignal A nalyser( SSA ). Doppler. Scattering. SSA Demo…..then click. CW Oscillator. CTFM SONAR. Formulae. Passive SONAR.

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  1. Mk.VIII 2.85 www.itp101.com

  2. NPL Transducer Polar Plot (National Physical Laboratory)

  3. Acoustic SystemsTrainer –SONAR R&D Platform Main Menu SONAR Signal Analyser(SSA) Doppler Scattering SSA Demo…..then click CW Oscillator CTFM SONAR Formulae Passive SONAR Active SONAR Dev & Underwater Sounds Range Resolution Acoustic Spectrum AST Console Transducer BeamWidth Transducer Beam Plot Installations

  4. Acoustic Systems Trainer – SONAR Britannia Royal Naval College : US Naval Academy – Weapons Engineering : Royal Norwegian Navy-SONAR Engineering : Royal Saudi Naval Force – Saudi Arabia : King Fahd Naval Academy – Saudi Arabia : Alenia Marconi Systems – Dundridge College : HMS Daedalus – RN Fleet Air Arm : HMS Collingwood – RN Maritime Warfare School : Britannia Royal Naval College – Dartmouth : University of Plymouth – Underwater Research : Texas A&M University – Marine Engineering : PLPE Kuala Lumpur - Malaysia : Singapore Navy – ASW School

  5. Acoustic Systems Trainer – SONAR R&D Platform Royal Navy – Maritime Warfare School – HMS Collingwood

  6. Acoustic Systems Trainer – SONAR R&D Platform Alenia Marconi Systems – Dundridge College

  7. Acoustic Systems Trainer – SONAR R&D Platform Royal Saudi Navy T.I.N.S Royal Saudi Navy – Technical Institute Naval Studies

  8. Acoustic Systems Trainer King Fahd Naval Academy

  9. Acoustic Systems Trainer – SONAR R&D Platform Main Menu TAMUG – Texas A&M University Galveston

  10. SONAR Signal Analyzer (SSA) SSAMenu Instrument Task Bar Oscilloscope Spectrum Analyzer SETUP Multi Meters Default Text Transient Recorder AWG with Burst Main Menu

  11. Acoustic Spectrum Sonic Regions Infra-Sonic Sonic Ultra-Sonic (Audio) 30Hz 18kHz 2kHz 9kHz 12kHz 50kHz 200kHz Passive Sonar Towed Arrays Long Range Sonar Active Search Sonar Dipping Sonar Torpedoes(Attack) AST Minehunting High Definition Oceanographic Sonar A.U.D.I – Acoustic Underwater Development Instrument Main Menu

  12. SSA Instrument Task Bar • Dual Channel • One Shot • Memos • Cursors • Ref Channels • Multi Trigger • Maths • Auto Set-up • Configurable • Peak-Peak • RMS • Mean • Crest • Frequency • Maths • Auto Freq.. • Over 190 days • Ref Channels • Cursors • Scroll • Scan • Memos • Zoom • Var Axis • Dual Ch. • Log Scale • Averaging • Cursors • Windows • Memos • Harmonic Analyzer • Sine • Triangle • Square • DC • White Noise • Sweep • Symmetry • Attenuation • Instrument • Configuration • Text • Colours • Start-up • CAL files • Duty Cycle • Directories • Exit Main Menu SSAMenu

  13. Oscilloscope Main Menu SSAMenu

  14. Multi Meters Main Menu SSAMenu

  15. Transient Recorder Main Menu SSAMenu

  16. Spectrum Analyzer Main Menu SSAMenu

  17. Function Generator AWG + Burst Main Menu SSAMenu

  18. SETUP Duty Cycle Active Instruments Colors Default Text Main Menu SSAMenu

  19. Doppler The Doppler effect is the frequency shift which occurs when a signal is transmitted from a moving platform towards a receiver, conversely, the transmitter could be stationary and the receiver could be in motion. In the most complex case, both transmitter and receiver could be moving with respect to each other. Whatever the case, there is a resultant change in frequency which can be detected and used to determine the speed and direction of motion. The following set-up is one method to enable the Doppler component to be extracted from a moving target echo. Use the Transient Recorder with the output from the Detector to record the Doppler shift. Main Menu

  20. Doppler Movie Observe the Phase change of the Doppler signal when the target changes direction, and the change in Signal Levelas the target opens and closes

  21. CW Transmitter Receiver Doppler Notes • AUX O/P GAIN <50% • TX2 O/P GAIN <50% • Detector IN/OUT ? • Align Receiver • Vary Speed/Direction • DC Coupling • .04 Secs • 1,000 Samples • 20V Sensitivity. OUT IN Detector Main Menu

  22. Range Resolution Movie Observe how both targets are resolved with optimum Pulse Width, and poor target discrimination with increasing PW.

  23. Range Resolution Notes • Align ‘Grill’ Target • Observe Two Echoes • Vary PRF/PW • SCOPE Reversible TX/RX Grill Target Main Menu

  24. Active SONAR Movie Observe the Transducer Ringdown, and the smaller amplitude echoes which appear to ‘follow’ the large target echo.

  25. Active SONAR Movie Observe how Pulse Width+ Ringdown Time determines the Minimum Range, and the Pulse Repetition Frequency orPRF, setsMaximum Range of the SONAR.

  26. Reversible TX/RX Target Active SONAR Notes • Align Small Target • Vary Speed/Direction • Identify Echoes • Vary PRF/PW/TX FREQ • SCOPE Main Menu

  27. Passive SONAR (Pulse) Movie Observe how the Active SONAR transmission, and the Target Echo are detected by the Passive SONAR Hydrophone.

  28. Projector TX Hydrophone RX Passive SONAR (Pulse) Notes • Align TX and Hydrophone • Vary TX FREQ • See Spectrum Analyzer • SCOPE Main Menu

  29. Reversible Tx/Rx Target Volume Scattering Notes • Align Target • Vary Speed/Direction • Scatter Salt • SCOPE Main Menu

  30. Beam Plot Movie Observe the smaller Sidelobes either side of the Mainlobes. These manual plots are only intended to give an approximation of the transducer’s Beam Pattern. See the NPL Plot on the next screen which was recorded in a very large, acoustically damped tank under ideal conditions.

  31. Side Lobes BW = 8º at-3dB Main Lobe National Physical Laboratory Transducer Polar Plot – 192kHz

  32. Rotate Handle Projector Test Transducer Acoustic Damping Beam Plot Notes • Acoustic Damping • AUX O/P GAIN <50% • Detector IN/OUT ? • Rotate Test Transducer… • CW…then CCW • DC Coupling • .04 Secs • 1,000 Samples • 20V Sensitivity. OUT IN Detector Main Menu

  33. Beam Width Notes • Acoustic Damping • Observe Spectrum Analyzer • Slide Test Transducer… • Set 0dB • Slide to first –3dB point… • Back to 0dB… • Slide to second –3dB point • Calculate BW • SPECTRUM CW Signal Source Test Transducer Main Menu Acoustic Damping

  34. Hydrophone RX Projector TX Passive SONAR (CW) Notes • Observe SCOPE… • Slide Hydrophone… • Vary TX FREQ • Observe SPECTRUM • Resonant Frequency? • SCOPE Main Menu

  35. Continuous Wave (CW) Oscillator Movie Observe the change in Frequency displayed in the Time Domain on the Oscilloscope.

  36. Continuous Wave (CW) Oscillator Movie Observe the change in Fundamental Frequency displayed in the Frequency Domain on the Spectrum Analyzer.

  37. Continuous Wave (CW) Oscillator Movie Observe the Fundamental (1st harmonic) and related Harmonics in the Frequency Domain.

  38. Continuous Wave (CW) Oscillator Notes • Observe SCOPE… • Slide Hydrophone… • Vary TX FREQ • Observe SPECTRUM • Resonant Frequency? • SCOPE Hydrophone RX Projector TX Main Menu

  39. CTFM SONAR IN OUT Detector • Notes • AUX O/P GAIN <50% • TX2 O/P GAIN <20% • Detector IN/OUT ? • Align Target • Vary Range of Target • Select- Preset 1 CTFM Tx and Rx Acoustic Damping Main Menu

  40. Development • Suggested development projects*- • Underwater communications. • Depth finder. • Air curtains. • Cavitation investigation. • Vortex activity. • Bottom profiling. • CTFM SONAR. • Refraction. • Signature analysis. • Parametric SONAR. • Target bearing detection. • Tracking • MAD – Magnetic Anomaly Detector • Shallow Water Back Scattering *Some projects have already been completed.

  41. Underwater Sound Analysis Acoustic Systems Trainer-Sonar Add-on

  42. Underwater Sound Analysis

  43. Underwater Sound Analysis Spectrogram Movie Dolphins Main Menu

  44. Formulae Power Gain = 10 log10 Pout decibels Pin Passive SONAR equation SE = (SL-PL) – N - DT Active SONAR equation SE = (SL+TS-2PL) – N - DT Speed of Sound in Sea Water (Wilson) C = 1449+4.6T-0.055T2+0.0003T3+(1.39-0.012T)(S-25)+0.017D Doppler Shift f = + 0.69Hz per knot per kHz f = + 1.33Hz per metre per second per kHz See reference text ‘SONAR FOR PRACTISING ENGINEERS’ Main Menu

  45. AST Mk VIII Console SONARSignalAnalyzer General Purpose &AUX Amps PRFTX FrequencyPulse WidthControls ArrayBeamSteering Echo Threshold Target SpeedControls Power Supply Outputs Main Menu

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