Utilization of antenna arrays in HF systems

Abstract

<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">Different applications of radio systems are based on the implementation of antenna arrays. Classically, radio direction</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">finding operates with a multi channel receiving system connected to an array of receiving antennas. More</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">recently, MIMO architectures have been proposed to increase the capacity of radio links by the use of antenna</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">arrays at both the transmitter and receiver.</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">The first part of this paper describes some novel experimental work carried out to examine the feasibility of applying</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">MIMO techniques for communications within the HF radio band. A detailed correlation analysis of a variety</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">of different antenna array configurations is presented. The second section of the paper also deals with HF</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">MIMO communications, focusing on the problem from a modelling point of view. The third part presents a sensitivity</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">analysis of different antenna array structures for HF direction finding applications. The results demonstrate</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">that when modelling errors, heterogeneous antenna arrays are more robust in comparison to homogeneous structures</p> <br />

Keywords

• Ionospheric channel – MIMO architecture – array processing – HF channel characterization – superresolution direction findingIonosphere – monitoring – data validation – monitoring techniques – campaigns – dissemination