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Angle of Arrival Measurements

Angle of Arrival Measurements

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The angle of arrival (AOA) is the most valuable information that can be obtained from an enemy radar because the radar cannot change its position drastically in a very short time frame (i.e., a few milliseconds). Unfortunately, the AOA information is also the most difficult information to obtain. It requires several antennas with receivers. The two common approaches to measure AOA are based on amplitude and phase comparisons. Another approach is to use the Doppler frequency shift generated by the aircraft movement. However, this approach is closely related to the phase measurement system. If the requirement is to measure AOA on simultaneous signals, the problem becomes even more complicated because receivers with multiple signal capability are needed.

Chapter Contents:

  • 15.1 Introduction
  • 15.2 Queuing Concept
  • 15.3 Digital Data From a Linear Antenna Array
  • 15.4 Outputs From a Circular Antenna Array
  • 15.5 Two-Element Phase Array Antenna
  • 15.6 AOA Measurement Through Zero Crossing
  • 15.7 Phase Measurement in AOA Systems With Multiple Antennas
  • 15.8 Fourier Transform Over Space Domain
  • 15.9 Two-Dimensional Fourier Transform
  • 15.10 Frequency Sorting Followed by AOA Measurements
  • 15.11 Minimum Antenna Spacing
  • 15.12 Chinese Remainder Theorem
  • 15.13 Application of Chinese Remainder Theorem to AOA Measurements
  • 15.14 Practical Considerations in Remainder Theorem
  • 15.15 Hardware Considerations for Digital AOA Measurements
  • References

Inspec keywords: aircraft; radar receivers; direction-of-arrival estimation; Doppler radar; radar signal processing

Other keywords: receivers; Doppler frequency shift; AOA; angle of arrival measurements; aircraft movement; enemy radar

Subjects: Radar equipment, systems and applications; Signal processing and detection

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