Using the far-field model in the near-field under-estimates MUSIC DOA errors, while near-field MUSIC estimates range accurately only below the Fraunhofer distance.
Estimation of RIS misorientation in both near and fa r field regimes,
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Impact of Model Mismatch on DOA Estimation with MUSIC: Near-Field and Far-Field
Using the far-field model in the near-field under-estimates MUSIC DOA errors, while near-field MUSIC estimates range accurately only below the Fraunhofer distance.