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Doppler Measurement

Doppler Measurement

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The Doppler shift is the apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer, caused by the relative motion of the observer and the wave source. This phenomenon is used in astronomical measurements, in radar, and in modern navigation sensors. It was first described in 1842 by Austrian physicist Christian Doppler.

Chapter Contents:

  • 10.1 The Doppler Shift
  • 10.1.1 Doppler Shift Derivation
  • 10.2 Doppler Geometry
  • 10.2.1 Targets moving at low velocities (v << c)
  • 10.2.2 Targets Moving at High Speed (v < c)
  • 10.3 Doppler Shift Extraction
  • 10.3.1 Direction Discrimination
  • 10.3.1.1 Sideband Filtering
  • 10.3.1.2 Offset Carrier Demodulation
  • 10.3.1.3 In-phase/Quadrature Demodulation
  • 10.4 Pulsed Doppler
  • 10.5 Doppler Sensors
  • 10.5.1 Continuous Wave Doppler Ultrasound
  • 10.5.2 Continuous Wave Doppler Radar
  • 10.5.2.1 Intruder Detection
  • 10.5.2.2 Sports Radar
  • 10.5.2.3 Police Radar Speed Trap
  • 10.5.2.4 Worked Example: Police Radar and Detector Comparison
  • 10.5.2.5 Projectile Tracking Radar
  • 10.5.2.6 Doppler Target Identification
  • 10.5.3 Pulsed Doppler Ultrasound
  • 10.5.4 Pulsed Doppler Radar
  • 10.6 Doppler Target Generator
  • 10.7 Case Study: Estimating the Speed of Radio Controlled Aircraft
  • 10.7.1 Background
  • 10.7.2 Measured Data
  • 10.8 References

Inspec keywords: Doppler shift; navigation; Doppler radar

Other keywords: radar; sound waves; Doppler shift; Austrian physicist Christian Doppler; wave source; modern navigation sensors; relative motion; Doppler measurement; observer; astronomical measurements; light waves

Subjects: Radionavigation and direction finding; Radar equipment, systems and applications

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