Design method of to-earth ultralow side lobe

Abstract

The invention discloses a design method of a to-earth ultralow side lobe. The method comprises the following realizing steps: 1. establishing a coordinate system, and determining a to-earth region according to the altitude of a satellite orbital; 2. determining the number of partitions to be subjected to an ultralow side lobe pattern synthesis, and determining an initial region of each partition;3. separately performing the ultralow side lobe pattern synthesis on the region of each partition by using an improved alternating projection algorithm, so as to obtain an array weighting value of each partition separately subjected to the ultralow side lobe pattern synthesis, and determining an actual action region of each ultralow side lobe pattern; and 4. selecting an appropriate array weighting value according to a scanning angle of the pitching direction of a main beam. The design method can quickly perform the ultralow side lobe pattern synthesis on the to-earth region through a large-scale planar array, has a relatively good suppression effect on side lobes in the to-earth region, effectively lowers the demand for the dynamic range of an attenuator, improves the aperture efficiencyof the array, reduces the gain loss, has short array synthesis time, and can meet the demand of a satellite-borne phased array for to-earth side lobe suppression.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to the shape optimization of an array antenna pattern, which can be used for the design of a large-scale array antenna with a low side lobe pattern for the earth area. Background technique [0002] In order to reduce the interference signal from the earth and improve the anti-interference ability of the system, it is usually necessary for the spaceborne phased array antenna to form a lower side lobe in the area facing the earth. The traditional approach is to use a single array weight in the form of an amplitude unimodal distribution similar to Taylor distribution or Chebyshev distribution to perform ultra-low sidelobe pattern synthesis for all sidelobes. However, for a planar array antenna, in order to achieve an ultra-low sidelobe pattern, a large amplitude excitation dynamic range is usually required, and due to the large attenuation of the array amplitude, the array...

AI Technical Summary

Problems solved by technology

Evolutionary algorithms are sensitive to the size of arrays. As the number of optimization variables increases, its optimization ability drops sharply, and it is usually difficult to optimize large-scale arrays.

The traditional alternating projection algorithm has a fast optimization speed and is not sensitive to the size of the array. It is very suitable for optimizing large-scale arrays. However, as a local optimization algorithm, it is easy to fall into a local optimal solution

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