Phase center measurement method of wideband antenna with symmetric main beams

Abstract

The invention relates to the technical field of the electronic reconnaissance direction-finding application, and discloses a phase center measurement method of a wideband antenna with symmetric main beams. The method comprises the following steps: establishing a two-dimensional orthogonal coordinate so that two beam axes are in a coordinate plane, wherein two beam axes are symmetric about a coordinate axis, and extension lines of two beam axes are intersected at an original point of the coordinate; taking a point C1 on the coordinate axis taking as a symmetric axis, and enabling the point C1 to be located at a far field area of each of two antennas; placing a radiation source with frequency as f0 at the point C1, and measuring phase difference phi1 of a receiving signal; moving the radiation source located at the point C1 to a C2 point along a direction vertical to the located coordinate axis in a coordinate plane, and computing the phase difference change value phi0 after moving the radiation source to the C2 point from the C1 point; and computing the coordinate location of the phase center of the measured antenna according to the phase difference change value phi0. The method disclosed by the invention is free from using a rotary table and like equipment, a testing condition requirement is low, the testing step is concise, the testing efficiency is high, and a new testing path is provided for the phase center measurement of the wideband antenna commonly used in the electronic reconnaissance.

Description

technical field [0001] The invention relates to the technical field of electronic reconnaissance and direction finding applications, in particular to a method for measuring the phase center of a broadband antenna with a symmetrical main beam. Background technique [0002] The electromagnetic wave radiated by the main beam of the antenna can be approximated as radiating from an ideal point source. If the phases of the far-field signal are equal to the equidistant from the point, then the point can be defined as the "phase center" of the antenna. point" (or simply "phase center"). The phase center of the antenna has an important influence on the direction finding application of the interferometer based on the phase comparison method in electronic reconnaissance, because in this direction finding application, multiple broadband unit antennas are used to form an antenna array to form an interferometer, and the electromagnetic target radiation The incoming wave direction of the ...

AI Technical Summary

Problems solved by technology

In fact, there are still some public documents that introduce various improvement measures for the phase center measurement method of the GNSS receiving antenna. Although there are differences in the specific data processing and analysis, the overall method flow is basically the same. Here no more introductions

[0015] From the above-mentioned summary of current antenna phase center measurement methods, it can be seen that: Type ① The traditional method of determining the antenna phase center through phase pattern testing is relatively standard in operation, but it requires turntables and other supporting equipment, and the test workload is relatively large

Although the second type is based on the three-antenna method and obtains the change law of the phase center of the antenna in the ultra-wide frequency band through six S-parameter measurements, but this method can only determine the relative change of the phase center of the broadband antenna, and it is difficult to determine the antenna under test. The exact location of the phase center

The third type of method is a special method for special objects, especially for the measurement of the phase center of the GNSS global satellite navigation receiving antenna, many unique methods are proposed. This type of method is very targeted and not widely applicable.

From the above three types of methods, the accurate measurement of the phase center of the broadband electronic reconnaissance receiving antenna can use the traditional method based on the phase pattern, but without the assistance of the turntable and other equipment, the phase pattern cannot be obtained accurately, thus limiting use of traditional methods

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