Ultra-large spacing array grating lobe-free large-angle scanning and arraying method

Abstract

The invention discloses an ultra-large spacing array grating lobe-free large-angle scanning and arraying method. The arraying method is simple, quick and high in grating lobe prevention efficiency, and is realized through the following technical scheme: constructing an x-axis direction unit spacing matrix of a two-dimensional rectangular planar array according to a grating lobe-free theory, determining a y-axis direction unit spacing by using an optimization algorithm, constructing a y-axis direction unit spacing matrix, and performing rectangular grid arrangement; dividing into three planar array areas I, II and III according to an x axis, and performing oblique angle arrangement on planar arrays of the planar array area I and the planar array area III; optimizing the positions of the sub-array A and the sub-array B on the y-axis by using an optimization algorithm, and integrally moving the sub-array A and the sub-array B in the y-axis direction; adjusting the shape of the whole two-dimensional planar array, increasing the space utilization rate, translating a sub-array C and a sub-array D above the planar array, arranging an array element level non-periodic array into an ultra-wideband grating lobe-free sparse array with more than three times of frequency, and obtaining a scanning grating lobe-free two-dimensional planar array structure in a range of + / -60 degrees.

Description

technical field [0001] The invention relates to an array arrangement method for ultra-large spacing and large-angle scanning of an antenna array, in particular to an array arrangement method for an ultra-wideband antenna array with a triple frequency or more. Background technique [0002] The rapid change of the beam direction of the phased array antenna is the result of the strict program control of the amplitude and phase of the array elements and the reasonable design of the element spacing. Since the maximum scanning space is limited by the element spacing of the array, the arrangement of the elements will also affect the scanning space. Usually, the array units of the planar phased array antenna can be arranged in a rectangular grid or in a triangular grid. However, if the unit spacing is too small, the following series of disadvantages will be produced: the mutual coupling between the units is strong, resulting in the radiation characteristics and impedance characteris...

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Problems solved by technology

[0006] Foreign literature studies the method of global optimization to carry out large-pitch grating-free lobe arrays, but this method has a relatively large amount of calculation, requires high hardware equipment, and takes a long time

Although the above-mentioned methods reduce the number of array elements required, more digital channels are still required for large arrays, resulting in high complexity and high cost of manufacturing the array.

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