Abstract
This paper deals with the use of a Nonuniform Linear Antenna array (NLA) for determining the Directions of Arrival (DOA) of a signal in 2450MHz frequency band. First, the principle of the DOA estimation method is described for the case of the MUSIC method. This paper also discusses the possibilities of optimizing the position of antenna elements in the NLA configuration, which are performed in analytical solutions and simulations. The simulation results are compared to the analytical results to obtain optimal NLA configurations for determining the signal DOA. Simulation results show that the probability of resolution and accuracy in determining the signal DOA are dependent on the antenna array aperture essentially. Furthermore, the realized NLA configuration was verified by an experimental measurement. The obtained experiment results demonstrate that the applied MUSIC method for NLA configuration is suitable and also highly accurate in determining the signal DOA, which was verified.
Highlights
Direction of Arrival (DOA) estimation is an important part of the signal processing field
The processing of signals from antenna arrays possesses a lot of benefits compared to signal processing from only one antenna element
This paper focuses on the signal source DOA estimation, especially on the Nonuniform Linear Array (NLA) configuration optimization, with the aim of increasing its angle accuracy and its resolution
Summary
Direction of Arrival (DOA) estimation is an important part of the signal processing field. Antenna arrays are used mainly for addressing the following problems: noise reduction, locating multiple signal sources, estimating the number of signal sources etc. The direction of arrival of radar signals is one of the most interesting parameters in Electronic Intelligence (ELINT). These DOA estimations are used in many classical methods such as amplitude methods and phase interferometers. In real life, it is often needed to determine the DOA of more than one signal or to address signal reflection problems. In these cases, the DOAs determined by the classical methods are inaccurate or highly distorted. One way of solving this problem is to use the high resolution sub-space methods of DOA estimation, mentioned in this paper
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