Element antenna phase center measuring method in array based on compact range

Abstract

The invention provides an element antenna phase center measuring method in an antenna array. The method is characterized in that a converting relation between a phase center position in the compact range and the phase difference among elements in the array and a relation between an array output power which is directly measured through the compact range and the phase difference among the elements in the array are derived; furthermore the compact range is used for directly measuring an array antenna combined output power; deriving the phase difference between unit antennae in the array accordingto a measuring result and further deriving a unit phase central position in the array. Through the measuring method of the invention, the phase center position of the unit antenna in the array can bemeasured.

Description

technical field

[0001] The invention relates to the measurement of the phase center of the unit antenna in the array, in particular, a method for measuring the phase center of the unit antenna in the array based on the compact field. Background technique

[0002] Array antennas are mainly used for beamforming or synthetic aperture imaging to meet the needs of fast and high-precision imaging. Determining the phase center of the element antenna in the array is a necessary condition for realizing high-precision array beam focusing. Usually, the antenna phase center is not on the antenna face, and it will change as the antenna direction angle increases. For array antennas, the position of the phase center of the antenna will further change due to the mutual coupling of other elements around the antenna in the array. When focusing or imaging the near-field beam of the array, in order to perform accurate phase compensation, it is necessary to obtain the distance between the ante...

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