AOA, Delay, and Complex Propagation Factor Estimation for the Monostatic MIMO Radar System

Saleh O Al-Jazzar,Sami Aldalahmeh

doi:10.1155/2018/2054271

Abstract

In this paper, we propose a solution to find the angle of arrival (AOA), delay, and the complex propagation factor for the monostatic multiple-input multiple-output (MIMO) radar system. In contrast to conventional iterative computationally demanding estimation schemes, we propose a closed form solution for most of the previous parameters. The solution is based on forming an approximate correlation matrix of the received signals at the MIMO radar receiver end. Then, an eigenvalue decomposition (EVD) is performed on the formed approximate correlation matrix. The AOAs of the received signals are deduced from the corresponding eigenvectors. Then, the delays are estimated from the received signal matrix properties. This is followed by forming structured matrices which will be used to find the complex propagation factors. These estimates can be used as initializations for other MIMO radar methods, such as the maximum likelihood algorithm. Simulation results show significantly low root mean square error (RMSE) for AOAs and complex propagation factors. On the other hand, our proposed method achieves zero RMSE in estimating the delays for relatively low signal-to-noise ratios (SNRs).

Highlights

Multiple-input multiple-output (MIMO) radar is becoming increasingly popular due to its ability to overcome the fluctuation in the received power caused by varying radar cross section [1]
Radar signals are transmitted from multiple transmitter antennas; they are reflected off targets and received back at the radar, providing the required receiver diversity. This operation requires estimating the angle of arrivals (AOAs) and delays of the received signals, which is usually done via a maximum likelihood (ML) method [9]
We propose a computationally inexpensive algorithm to find the AOAs, delays, and complex propagation factors for monostatic MIMO radar systems

Summary

Introduction

Multiple-input multiple-output (MIMO) radar is becoming increasingly popular due to its ability to overcome the fluctuation in the received power caused by varying radar cross section [1] It is proposed in the literature as a tool to estimate the location of different targets [2,3,4,5,6,7,8]. Radar signals are transmitted from multiple transmitter antennas; they are reflected off targets and received back at the radar, providing the required receiver diversity This operation requires estimating the angle of arrivals (AOAs) and delays of the received signals, which is usually done via a maximum likelihood (ML) method [9].

Problem Formulation

The Proposed Method

H MĴlk Ĵlk H MH sTx θk

Simulation

Conclusion