Open AccessRSS-Based DoA Estimation Using ESPAR Antennas and Interpolated Radiation Patterns
Author(s) -
Lukasz Kulas
Publication year - 2018
Publication title -
ieee antennas and wireless propagation letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.328
H-Index - 117
eISSN - 1548-5757
pISSN - 1536-1225
DOI - 10.1109/lawp.2017.2772043
Subject(s) - fields, waves and electromagnetics
In this letter, it is shown how an algorithm, which employs received signal strength values in order to estimate direction of arrival (DoA) of impinging signals in wireless sensor network (WSN) nodes equipped with electronically steerable parasitic array radiator (ESPAR) antennas, can easily be improved by applying an interpolation algorithm to radiation patterns recorded in the calibration phase of the DoA estimation process. The proposed method allows one to measure ESPAR antenna's radiation patterns during the initial calibration phase with much coarser than 1° angular resolution, while the overall DoA estimation accuracy can be kept at the similar level. Measurements using a fabricated ESPAR antenna have indicated that anechoic chamber calibration procedure of WSN nodes equipped with such antennas can be done almost 50% faster, which in consequence will reduce system deployment costs in practical WSN applications where a number of WSN nodes can easily reach hundreds.