Summary
International Symposium on Antennas and Propagation
2012
Session Number:2C3
Session:
Number:2C3-5
Near-field Target Location Estimation by Using Khatri-Rao Product Array
Satoshi Shirai, Hiroyosho Yamada, Yoshio Yamaguchi,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
In recent years, high-resolution near-field target location estimation technique for indoor wireless terminal detection, medical imaging and so forth, using an array antenna have been studied actively. In many applications, small number of array elements is desirable. Recently, at simple array signal processing technique called Khatri-Rao (KR) product array has been proposed. By using the technique, degrees-of-freedom (DOF) of the array can be easily increased. Strictly speaking, this holds only for uncorrelated wave incidence. When, the waves are correlated or coherent accuracy of, parameter estimation deteriorates by the signal correlation terms. The estimation error can be decreased when we estimate correlation terms in addition to the signal terms. It costs DOF of the array, and not effective for signal parameter estimation in far-field. On the other hand, if the wave sources are located in near-field, incoming wave becomes spherical wave at the receiving array. Therefore, it can be expected that we can obtain further DOFs by the Khatri-Rao product expansion. In this paper, we consider the effect of increase of DOF by the Khatri-Rao product array for spherical wave numerically, and show that the location estimation accuracy can be improved by using the increased DOFs even when all of the incoming wave are coherent.