On isotropic circular arrays of anisotropic sensors

Houcem Gazzah (1) , Jean-Pierre Delmas (2, 3, 4, 5)

1 Department of Electrical and Computer Engineering (University of Sharjah)
2 TIPIC-SAMOVAR - Traitement de l'Information Pour Images et Communications
3 TSP - CITI - Communications, Images et Traitement de l'Information
4 SAMOVAR - Services répartis, Architectures, MOdélisation, Validation, Administration des Réseaux
5 CNRS - Centre National de la Recherche Scientifique

Uniform circular arrays are popular in direction finding applications because they show to be isotropic, i.e. they exhibit the same accuracy (in terms of the Cramer-Rao bound) at all possible planar look directions. We prove that this is not absolutely true if the constituent sensors are not isotropic. For instance, we specify how the anisotropic sensors should be directed and how many are needed in order to ensure an isotropic behavior of the array. We study, in more details, the performance of arrays of cardioid sensors, including anisotropic arrays of cardioid sensors

Mots clés: Cramer Rao bound; Direction of arrival estimation; Cardioid sensors

Domaines: Traitement du signal et de l'image [eess.SP]

Houcem Gazzah, Jean-Pierre Delmas. On isotropic circular arrays of anisotropic sensors. ISSPIT 2015 : International Symposium on Signal Processing and Information, Dec 2015, Abu Dhabi, United Arab Emirates. pp.95 - 99, ⟨10.1109/ISSPIT.2015.7394427⟩. ⟨hal-01256700v2⟩