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System for correcting amplitude and phase errors across an antenna array
System for correcting amplitude and phase errors across an antenna array
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机译：用于校正天线阵列上的幅度和相位误差的系统
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摘要
A method or means of calibrating a phased antenna array comprises receiving a signal on a plurality of array elements where one of the said array elements is selected as a reference. The phase shift of the received signal at each of the antenna elements is measured relative to that of the said reference element. The phase shift values are unwrapped to provide absolute phase shift values across the array. A function which provides the best fit to the variation in the absolute phase shift values across the array is estimated. The difference between the measured phase shift values with that predicted by the said function is calculated and used to adjust subsequent measurements from the antenna array elements. The amplitude for each antenna element may be established by multiplying the gain of an element by its inverse and multiplying the result by the geometric mean of the gains across the antenna array for the received signal. A suitable programmed computer may be used for the necessary calculations and signal processing involved in the said system.
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