Estimating two-dimensional angles of arrival in coherent source environment

Abstract

In this work, estimating two-dimensional (2-D) angle of arrival for radiating sources in a coherent environment is studied. The concept of spatial smoothing is first extended to a rectangular planar array and a 2-D search function is formed t o estimate the source directions. To avoid performinga 2-0 search, an approach based on two onedimensional (1-D) searches is also discussed. This approach uses rows and columns of the rectangular array to perform I-D searches. To match the data obtained, a 2-D verification is then performed. Computer simulation results for both approaches based on the MUSIC method are presented.

Two‐dimensional adaptive beamforming in DS‐CDMA communication with local scattering channels

“…The element spacing along X and Y axes is δ. Assuming that the DOA of the ith source s i (t) is denoted by the azimuth and the elevation angles (ϕ i , θ i ), the received signal of the mnth sensor can be written as (Yeh et al, 1989) …”

“…Therefore, a 2-D antenna array is usually required for the purpose of adaptive beamforming, especially for mobile users near the base station. Although, there have been many 2-D direction estimation algorithms, such as the 2-D coherent MUSIC algorithm (Yeh et al, 1989) and the 2-D MUSIC-ESPRIT algorithm (Yin et al, 1989), they are not suitable for DOA estimation in local scattering channels. In this paper, we extend the GAM model of 1-D uniform linear array to the generalized plane-type array manifold (GPAM) model which can be employed to estimate a 2-D source direction in a multipath reflection scenario from scatterers.…”

A Tree Structure One-Dimensional Based Algorithm for Estimating the Two-Dimensional Direction of Arrivals and Its Performance Analysis

“…In [6], Zoltowski et al propose a closed form 2-D unitary ESPRIT algorithm for solving the estimation problem either in the element space or in the beamspace. In addition, Yeh et al [7] introduce the spatial smoothing 2-D-MUSIC algorithm for the estimation of the 2-D DOA of coherent sources. By taking advantage of the block spatial smoothing technique to span the signal subspaces, both the spatial smoothing 2-D-MUSIC algorithm and the 2-D unitary ESPRIT algorithm can be applied to the scenarios using either a single snapshot only or multiple ones.…”

“…Several algorithms have been proposed for solving the 2-D-DOA estimation problem [2]- [7]. Fernandez et al [2] propose a matrix-pencil-based method to estimate the 2-D-DOAs directly from a single snapshot of the antenna received data instead of its covariance matrix for reducing the required computations.…”

Detect and Pointing Algorithms Performance for a 2D Adaptive Antenna Array

“…(10) is evaluated. In the presence of coherent signals, as in multipath environments, spatial smoothing schemes [15,16] must be applied to suppress the correlations between the incoming signals.…”