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EM Wave Source Object Re-radiated EM field ???. GeneratorTransmission Line Dipole Antenna free space wave uniform traveling wave reflected traveling wave.

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Presentation on theme: "EM Wave Source Object Re-radiated EM field ???. GeneratorTransmission Line Dipole Antenna free space wave uniform traveling wave reflected traveling wave."— Presentation transcript:

1 EM Wave Source Object Re-radiated EM field ???

2 GeneratorTransmission Line Dipole Antenna free space wave uniform traveling wave reflected traveling wave Continuous Energy Density (Standing Wave)

3 Power Density decreased in this region due to reflection from parabaloid. Reflective Parabaloid

4 Detector Aperture (Antenna) Receiver (Rx) Signal Generator Transmitter(Tx) Bistatic System Object

5 Detector Signal post-conditioning to enable detection (sampling and averaging) Signal preconditioning to enable detection (change frequency, amplitude, etc.) Signal +Noise (1) Electronic Noise (2) Aperture (Antenna) Receiver (Rx)

6 Detector STIMULATED Signal +Noise (1) Aperture (Antenna) Receiver (Rx) Signal Generator Transmitter(Tx) Circulator or Mixer Monostatic System

7 Radar Basics: Pulses and Range Gates Transmitted Pulse Noiseless Receiver Ln P r Time

8 Signals and Noise Transmitted Pulse Observed Signal (target echo plus noise) Ln P r Time

9 Signal Averaging and Detection Transmitted Pulse Observed Signal plus noise After Signal Averaging (target echo plus noise) Ln P r Time

10 The Radar “Bright” Band

11 Multiple “Bright” Bands

12 Steradians A Radian "cuts out" a length of a circle's circumference equal to the radius. A Steradian* "cuts out" an area of a sphere equal to (radius) 2. *The name steradian is made up from the Greek stereos for "solid" and radian. The SI Unit abbreviation is "sr". Sphere vs Steradian The surface area of a sphere is 4πr 2. The surface area of a steradian is just r 2. So a sphere measures 4π steradians, or about steradians. Likewise a steradian is 1/12.57, or about 8% of a sphere.


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