A Novel Localization Method Based on FDA Beam Intersection

Abstract

In the past localization methods, both mechanical and phased array radars require angle scanning because their beampatterns are only angle-dependent, resulting in the echo time difference only contains the range information of the target. It will cause some ambiguity problems and limitations. Since Frequency Diverse Array (FDA) was proposed, its range-angle dependent beampattern provided more degrees of freedom (DoFs) to obtain more information in array signal processing. However, how to use these increased DoFs to get more information still needs to be studied. In this paper, we propose a novel localization method using FDA beam intersection. In this proposed method, part of the FDA beampattern approximates a straight line and propagates throughout the range axis. This moving beam line can capture the target like a fast-moving net and the echo time difference contains both the angle and range information of the target. By a simple straight-line intersection, we can obtain the whole position information, where two FDA beam lines intersect at the target. A simulation diagram is provided to illustrate the proposed localization process.