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Ultrasonic Radar System

Ultrasonic Radar System. By Kenny McChesney. Ultrasonic System. Transmits sound waves vs. electromagnetic Same radar concepts, different assumptions Sound waves travel at smaller velocity Higher attenuation over distance Same radar components except sensors

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Ultrasonic Radar System

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  1. Ultrasonic Radar System By Kenny McChesney

  2. Ultrasonic System • Transmits sound waves vs. electromagnetic • Same radar concepts, different assumptions • Sound waves travel at smaller velocity • Higher attenuation over distance • Same radar components except sensors • Transducers: convert electrical signals to acoustic • Two different operating modes • Pulse Radar • FMCW

  3. Functional Block Diagram

  4. System Setup Transducers -Knowles SPU0410LR5 Omni-directional ( -Kobitone 400SR160 ()

  5. Kobitone Example

  6. Results • Require a 10 dB SNR to perform successful signal processing

  7. Pulse Compression Current Example Without Pulse Compression Pt = 1 W τ = 100 us B = 10 kHz E = 100 uJΔR = 17.2 mm SNR = 15 dB Blind Range = 17.2 mm With Pulse Compression Pt = 1 mWτ = 100 ms B = 10 kHz E = 100 uJΔR = 17.2 mm SNR = 15 dB Blind Range = 17.2 m

  8. Improvements • Coherent Integration • Improve SNR by combining echo signals in the slow time • Ideal for stationary targets since phase is unchanged • Get more accurate noise information to improve experimental accuracy

  9. Questions?

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