Embattling method of logarithmic spiral array antennas

Abstract

The invention discloses an embattling method of logarithmic spiral array antennas. An antenna array uses N logarithmic spirals to embattle; a single logarithmic spiral line function is as follows: r=e, and an antenna unit is displaced on the logarithmic spiral line function r=e, wherein (r, phi) is a position coordinate of any point on the logarithmic spiral line under polar coordinates, r is a distance from the point to an original point (unit: wavelength), namely a relative wavelength number, phi is an angle relative to a polar axis (0 degree), and a is a parameter of the logarithmic spiral line function and is an optimizable constant for designing the array; the antenna unit n on each logarithmic spiral is arranged at the position of phi n along the spiral line function; the phase difference between adjacent units is delta phi; N spiral lines rotate 360 degrees / N rounding a rotating shaft in turn; r of the initial starting point of each logarithmic spiral line is the same; the phase position of the initial starting point of the first starting point on each spiral line is phi0; m array elements are respectively arranged on each spiral line from the initial starting point at an interval of delta phi; one array element can be placed at the center of the array, namely original point, or not; when the parameter a, delta phi and phi0 are determined, an array manifold is determined; and the total antenna unit number of N logarithmic spiral arrays is Nm+1.

Description

technical field The invention relates to super-resolution spatial spectrum (Direction of Arrival (DOA)) estimation technology, in particular to a logarithmic spiral array antenna arrangement method, which can realize high-resolution two-dimensional direction of arrival (DOA) estimation And target measurement, imaging, can be used in radar systems, communication systems and astronomical observation and other fields. Background technique Super-resolution spatial spectrum estimation technology, also known as Direction of Arrival (DOA) estimation technology, can accurately estimate the direction and spatial distribution of spatial signal sources, breaking through the limitation of the Rayleigh limit of traditional direction finding systems. It has a wide range of applications in the fields of , sonar, navigation, seismic detection and medicine. The acquisition of the spatial spectrum is achieved by the superposition and extraction of the antenna array signals. Therefore, the ar...

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Problems solved by technology

At present, the analysis and synthesis methods of antennas mainly focus on the electromagnetic radiation characteristics of antennas, and less attention is paid to the influence on the acquisition of spatial spectrum; in the research of array signal processing theory, although there are some researches on the array manifold problem of one-dimensional linear array More in-depth research, such as equidistant arrays, non-equidistant arrays, virtual arrays, etc., but less research on two-dimensional arrays that are more realistic and more targeted

The conventional method of increasing the spacing between antenna elements to improve the resolution of the array will inevitably form grating lobes, resulting in false spectral peaks resulting in a decrease in resolution

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