Design and evaluation of a novel antenna array for azimuthal angle-of-arrival measurement

This paper describes a novel antenna array concept in which a "Y"-shaped distribution of elements is used to achieve uniform angle-of-arrival (AOA) measurement performance in azimuth, and a ground plane is employed to reduce the potential for confusion due to scattering from nearby structures and interference from low elevation angles. A simple method for field calibration of this array is also presented. A prototype has been built and tested in field conditions at 460 MHz. Using maximum likelihood estimation, the array is able to resolve single AOAs to within a few degrees and is able to identify discrete multipath from the same source. A shortcoming of the field-tested design is that it has poor gain along the horizon, due to edge diffraction from the ground plane. To control this diffraction, an elliptical rolled edge termination is proposed. It is shown that a rolled edge increases the horizon gain by 5 dB while maintaining high suppression at low elevations and maintaining a low physical profile.

[1]  W. Burnside,et al.  A uniform GTD analysis of the diffraction of electromagnetic waves by a smooth convex surface , 1980 .

[2]  W. Burnside,et al.  A diffraction coefficient for a cylindrically truncated planar surface , 1979 .

[3]  Petre Stoica,et al.  MUSIC, maximum likelihood, and Cramer-Rao bound , 1989, IEEE Transactions on Acoustics, Speech, and Signal Processing.

[4]  Jerry M. Mendel,et al.  Applications of cumulants to array processing. III. Blind beamforming for coherent signals , 1997, IEEE Trans. Signal Process..

[5]  A.J. Paulraj,et al.  Space-time processing for wireless communications , 1997, 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[6]  S. Kay.  Fundamentals of statistical signal processing: estimation theory , 1993 .

[7]  Alan J. Fenn,et al.  Theoretical and experimental study of monopole phased array antennas , 1985 .

[8]  J. P. Kennedy,et al.  Smart Antenna Testbed for Mobile Wireless Systems , 1997 .

[9]  P.E. Mogensen,et al.  Preliminary measurement results from an adaptive antenna array testbed for GSM/UMTS , 1997, 1997 IEEE 47th Vehicular Technology Conference. Technology in Motion.

[10]  W. Burnside,et al.  An aperture-matched compact range feed horn design , 1985 .

[11]  Arogyaswami Paulraj,et al.  On optimizing base station antenna array topology for coverage extension in cellular radio networks , 1995, 1995 IEEE 45th Vehicular Technology Conference. Countdown to the Wireless Twenty-First Century.

[12]  Theodore S. Rappaport,et al.  Overview of spatial channel models for antenna array communication systems , 1998, IEEE Wirel. Commun..

[13]  Jeffrey H. Reed,et al.  Position location using wireless communications on highways of the future , 1996, IEEE Commun. Mag..

[14]  Jerry M. Mendel,et al.  Applications of cumulants to array processing. IV. Direction finding in coherent signals case , 1997, IEEE Trans. Signal Process..

[15]  Ilan Ziskind,et al.  Maximum likelihood localization of multiple sources by alternating projection , 1988, IEEE Trans. Acoust. Speech Signal Process..

[16]  R. Kouyoumjian,et al.  A uniform geometrical theory of diffraction for an edge in a perfectly conducting surface , 1974 .

[17]  Jeffrey H. Reed,et al.  Wireless Personal Communications: Advances in Coverage and Capacity , 1997 .

[18]  David G. Long,et al.  Array signal processing , 1985, IEEE Trans. Acoust. Speech Signal Process..

[19]  W. Burnside,et al.  An aperture-matched horn design , 1980 .

[20]  Y. Hua,et al.  An L-shaped array for estimating 2-D directions of wave arrival , 1991 .

[21]  D. Mitchell Wilkes,et al.  Adapting the geometry of a sensor subarray , 1993, 1993 IEEE International Conference on Acoustics, Speech, and Signal Processing.