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Introduction to radar and radar communications

Introduction to radar and radar communications

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Radio detection and ranging (RADAR) is a method of using electromagnetic waves to determine the position of a target. Radar transmits a signal and receives and detects a portion of the signal that is reflected back to the radar. Radar uses this return signal or echo to measure the time it is transmitted to the time it is received to determine the range of the target. In addition, the returned signal can be received by the radar antenna to determine the angle it received. Therefore, radar can determine the range and direction, velocity, and identifying characteristics of targets by monitoring the reflected signals coming back to the radar.

Chapter Contents:

  • 14.1 Radar applications
  • 14.2 Two basic radar types
  • 14.3 Basic pulse radar operation
  • 14.3.1 Pulse radar modulation
  • 14.3.2 Radar cross section
  • 14.3.3 Radar path budget
  • 14.3.3.1 The transmit path
  • 14.3.3.2 The receive path
  • 14.3.3.3 Combined total radar path
  • 14.3.4 Range determination
  • 14.3.4.1 Sound wave example
  • 14.3.4.2 Radar range calculations
  • 14.3.4.3 Slant range
  • 14.3.4.4 Range ambiguity
  • 14.3.4.5 Minimum range
  • 14.3.4.6 Range resolution
  • 14.3.5 Bearing
  • 14.3.5.1 Angle resolution
  • 14.3.5.2 Resolution cell
  • 14.3.6 Radar accuracy
  • 14.3.7 Plan position indicator and A-Scope
  • 14.3.8 Probability of detection and false alarms
  • 14.3.9 Pulsed system probabilities using binomial distribution function (BDF)
  • 14.3.10 Pulse shaping for radars
  • 14.4 Clutter
  • 14.5 Radar frequency bands
  • 14.6 Moving target indicator
  • 14.7 One-way passive radar Doppler effects
  • 14.8 Two-way active radar Doppler effects
  • 14.9 MTI sampling process
  • 14.10 Multiple pulse MTI radar
  • 14.11 Types of radar antennas
  • 14.12 Block diagrams of a pulse radar system
  • 14.13 Other types of radars
  • 14.13.1 Search, acquisition, and track radar
  • 14.13.2 Missile and missile guidance radars
  • 14.13.3 Airborne radars
  • 14.13.4 Frequency diversity radar
  • 14.13.5 Chirped radar
  • 14.13.6 Digital pulse compression radar
  • 14.13.7 Frequency-modulated CW radar
  • 14.13.8 Doppler radar
  • 14.13.9 Next-generation radar weather radar
  • 14.13.10 Terminal Doppler weather radar (TDWR)
  • 14.13.11 Synthetic-aperture radar (SAR)
  • 14.14 Radar communications
  • 14.14.1 Direct burst pulse-coded modulation (PCM) for communications
  • 14.14.2 Pulse-coded modulation/pulse position modulation
  • 14.14.3 Radar communication applications
  • 14.14.4 Advantages of PCM/PPM against Doppler and multipath
  • 14.15 Conclusion
  • 14.16 Problems
  • Further reading

Inspec keywords: radar detection; radar antennas

Other keywords: radio detection and ranging communication; electromagnetic wave; RADAR communication; signal detection; radar antenna; radar detection; radar transmission

Subjects: Radar equipment, systems and applications; Single antennas; Signal detection

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