1 / 10

Angle of Arrival Estimation (AOA)

Angle of Arrival Estimation (AOA). Patrick McCormick EECS 725. Types of AOA estimation. Single or Dual-Axis Monopulse. Phase-comparison monopulse. Fig 1: Dual axis monopulse model [1]. Fig 2: ULA AOA estimation model [2]. Array geometry. Beamforming.

blaine
Télécharger la présentation

Angle of Arrival Estimation (AOA)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Angle of Arrival Estimation (AOA) Patrick McCormick EECS 725

  2. Types of AOA estimation • Single or Dual-Axis Monopulse • Phase-comparison monopulse Fig 1: Dual axis monopulse model [1] Fig 2: ULA AOA estimation model [2]

  3. Array geometry

  4. Beamforming • In phased-arrays, beamforming is the concept of applying complex weightings to a waveform on transmit or receive. • A simple form of this is applying a uniform phase shift across the array to steer to a particular point in space. • This requires the use of multiple elements and knowledge of their arrangement (i.e. ULA or planar array) • The beam-pattern and spatial resolution are dependent on the number of elements and their spacing. Fig 3: ULA Rx Beamforming [3]

  5. Phase-Comparison Monopulse

  6. Steering Vector • Knowing the phase shift between received elements, we can compensate for the phase misalignment using a steering vector. • Typically in signal processing, the data is converting down to complex baseband (I and Q) samples for processing. Therefore, the phase shift can be represented by a complex exponential.

  7. Coherent Integration Analogy • The array is typically comprised of elements of low gain, but when combined coherently (beamforming) they can create large gains. • For an isotropic antenna, the receive gain of an array is essentially the coherent integration within one pulse over many elements. • Can still integrate over many pulses to achieve an even higher processing gain!

  8. Example 1

  9. Example 2

  10. Future Work • Extension into elevation and azimuth planes (planar array). • Matlab examples • Generalized steering vector including both angles

More Related