Direction Finding for Bistatic MIMO Radar with Uniform Circular Array

Cao Yunhe,Wang Shenghua,Dai Fengzhou,Zhang Zijing

doi:10.1155/2013/674878

Abstract

A method of direction of arrival (DOA) and direction of departure (DOD) angle estimation based on polynomial rooting for bistatic multiple-input multiple-output (MIMO) radar with uniform circular array (UCA) configuration is proposed in this paper. The steering vector of the UCA is firstly transformed into a steering vector with a Vandermonde structure by using the Jacobi-Anger expansion. Then the null-spectrum function of the MIMO radar can be written as an expression in which the transmit and receive steering vectors are decoupled. Finally, a two-step polynomial rooting is used to estimate DOA and DOD of targets instead of two-dimensional multiple signal classification (MUSIC) search method for bistatic UCA MIMO radar. The angle estimation performance of the proposed method is similar to that of the MUSIC spectral search method, but the computation burden of the proposed polynomial rooting algorithm is much lower than that of the conventional MUSIC method. The simulation results of the proposed algorithm are presented and the performances are investigated and analyzed.

Highlights

Research on multiple-input multiple-output (MIMO) radar has been growing as evidenced by an increasing body of literature [1,2,3,4,5,6,7,8,9,10]
We present simulation results showing the statistical performance of the proposed algorithm when using uniform circular array (UCA) configuration
The following settings have been used: two uncorrelated sources impinging the arrays with equal powers from the angles (θ1, φ1) = (10∘, 20∘) and (θ2, φ2) = (50∘, 40∘), 256 snapshots, and 100 independent Monte Carlo trials

Summary

Introduction

Research on multiple-input multiple-output (MIMO) radar has been growing as evidenced by an increasing body of literature [1,2,3,4,5,6,7,8,9,10]. In order to avoid angle search, estimation of signal parameters via rotational invariance techniques (ESPRIT) algorithm is applied to bistatic MIMO radar [3,4,5,6,7] by exploiting the invariance property of the transmit and receive arrays. In [8, 9], several algorithms based on polynomial root finding procedure are proposed to estimate DOA and DOD of targets. In order to come up with computationally efficient high-resolution DOA estimators for UCAs, the so-called beamspace transform [11,12,13] may be applied It rebuilds desired Vandermonde structure for the steering vectors. An algorithm based on polynomial root finding to estimate DOA and DOD of targets in bistatic MIMO radar with UCA configure is proposed.

Signal Model

Direction Finding for Bistatic MIMO Radar with UCA Configuration

Simulation Results

Conclusion