Method for improving phased array beam-pointing accuracy

Abstract

The invention relates to the technical field of phase arrays and discloses a method for improving phased array beam-pointing accuracy. The method specifically comprises the following steps: calculating a phase shifter phase feeding quantization step value according to the number of array elements; initializing the quantization step value and an ideal phase feeding value; determining a central array element position; calculating the times of the total recursion of a whole extrapolation process; finding a phase shifter phase feeding quantization step value which has a smaller different absolute value with the ideal phase feeding value of the central array element and using the phase shifter phase feeding quantization step value as an actual phase feeding value of a central array element phase shifter, and calculating an initial phase error; entering the extrapolation array element phase feeding; keeping a smallest accumulated phase error of an affirmed phase feeding array element in an extrapolation result; and circulating the extrapolation array element phase feeding till the times of the extrapolation being equal to the times of the total recursion so as to accomplish the phase feeding of all array elements. At the moment, all array elements have the smallest accumulated phase error; and a beam pointing error achieves a smallest value according to a linear relationship between the phase quantization error and the beam pointing error, and then the beam pointing accuracy of the phased array is improved.

Description

technical field [0001] The invention relates to a phased array system, in particular to a method for improving the pointing precision of a phased array beam. Background technique [0002] In the existing phased array system, the beam pointing of the antenna is performed by the beam control system, which mainly realizes the change of the spatial pointing of the beam by controlling the phase and gain of each array element. When the linear array beam composed of N array elements with a spacing of d is directed at an angle of θ, its ideal pattern is where I k is the amplitude excitation gain of each array element, φ k is the phase feed value of each array element, it can be seen that the phase feed accuracy of each array element directly affects the beam pointing accuracy. The phase shifter is a key component of the phased array antenna. It uses digital control to feed the phase of each array element. Limited by the number of phase shifters, its phase feed value can only be ...

AI Technical Summary

Problems solved by technology

The beam pointing error caused by the phase quantization error is unavoidable. In engineering applications, the rounding method, the two-possible value method, and the pre-added phase method are commonly used to correct this error, but none of them can reduce the extreme of the beam pointing error. Effect of value and mean square error

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