A Method of Realizing Large Angle Scanning of Uniform Linear Array Broadband Beam

Abstract

The disclosure provides a method for realizing wide-angle scanning of a uniform linear array broadband beam. According to the bandwidth of the received signal, the selection of the optimal array element spacing is determined; based on the half-wavelength corresponding to different frequency points and the array element spacing, calculate each The scanning angle at which grating lobes do not appear at the frequency point; determine the number of array elements according to the required accuracy requirements; determine the number of arrays and the angle between the arrays according to the obtained scanning angle of each frequency point; perform frequency domain analysis on each array Broadband beamforming. The large-angle scanning of the broadband beam based on the uniform linear array is realized, and it is simpler, easier to realize and more adaptable than the current technology.

Description

technical field [0001] The disclosure belongs to the technical field of expanding the scanning angle of a broadband beam, and in particular relates to a method for realizing a wide-angle scanning of a uniform linear array broadband beam. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] An array antenna is an antenna array composed of many small antenna elements arranged in a certain way. The commonly used antenna array forms include one-dimensional linear array, two-dimensional circular array and square array. The uniform linear array is a typical antenna array, and it is also the simplest and most commonly used array structure. In various arrays, the distance between the array elements is generally chosen to be half the wavelength of the received signal. If the distance between the array elements is too small, the width of the main lobe ...

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Problems solved by technology

In various arrays, the distance between the array elements is generally chosen to be half the wavelength of the received signal. If the distance between the array elements is too small, the width of the main lobe will be widened, the accuracy will be reduced, and the mutual coupling between the array elements will become larger, resulting in an array The side lobe level of the antenna pattern increases and the gain decreases; the distance between the array elements is too large, which will cause grating lobes to be generated when the beam scans at a large angle, which will affect the scanning range of the beam, which is very unfavorable for sun tracking and observation of solar signals

[0004] In order to avoid grating lobes when the beam scans from -90° to 90°, the distance between the elements of the antenna needs to be less than half a wavelength. However, in broadband beamforming, because the signal bandwidth is relatively large, it can no longer be regarded as a single-frequency point signal. If If the array element spacing is the half-wavelength corresponding to the lowest frequency point, grating lobes will be generated at other frequency points. If the half-wavelength corresponding to the highest frequency point is used, there will be no grating lobes, but the width of the main lobe will become wider. The accuracy is reduced. At the same time, due to the constraints of the physical size of the antenna, the distance between the array elements often cannot reach the half-wavelength corresponding to the highest frequency point.

[0005] According to the knowledge of the inventor, most of the current existing solutions have problems such as irregular arrangement of antenna arrays, limitations of mechanical rotation speed and rotation accuracy, etc.

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