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Continuous-wave surface-acoustic-wave delay-difference device.

R B Ward1

  • 1Lockheed Res. Lab., Palo Alto, CA.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1989
PubMed
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A new surface-acoustic-wave (SAW) device accurately measures signal delay for direction finding and rejects interference. This continuous-wave (CW) delay-difference device (DDD) offers reliable performance across a wide bandwidth.

Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Acoustics

Background:

  • Accurate measurement of signal delay is crucial for applications like direction finding.
  • Wideband interference rejection is a persistent challenge in various electronic systems.
  • Existing methods may require gated operation or are sensitive to signal variations.

Purpose of the Study:

  • To introduce a novel surface-acoustic-wave (SAW) device for continuous-wave (CW) delay-difference measurement.
  • To demonstrate the device's capability for wideband interference rejection at VHF frequencies.
  • To evaluate the performance of the SAW device in terms of accuracy and robustness.

Main Methods:

  • Development of a novel surface-acoustic-wave (SAW) device.
  • Testing the device's performance for continuous-wave (CW) delay-difference measurement.

Related Experiment Videos

  • Evaluating the device's effectiveness in wideband interference-rejection mode.

    • Main Results:

    • The delay-difference device (DDD) operates at 160 MHz with a 31-MHz bandwidth and minimal amplitude ripple (0.13 dB RMS).
    • The CW DDD accurately measures relative signal delay, even with modulated or amplitude-unbalanced signals.
    • The device demonstrated an average of 25-dB signal rejection over its 31-MHz bandwidth in interference cancelling mode.

    Conclusions:

    • The novel SAW device provides accurate continuous-wave (CW) delay-difference measurement.
    • The device effectively performs wideband interference rejection without gated operation.
    • This technology offers a robust solution for direction finding and signal processing applications.