Effects of local oscillator errors on digital beamforming
Siu, Marcos Chi Lim
Jenn, David C.
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Digital phased array antennas are sensitive to phase error among elements because it affects the coherence necessary to create the array factor. There are many sources for phase errors: local oscillators and clocks, quadrature modulators and demodulators, non-linear components, and so forth. Additionally, phased arrays are sensitive to element mislocation, which introduces another source of phase error. In this research, three types of phase errors were studied: phase noise, gain unbalance in quadrature modulators and demodulators, and element mislocation. Modifications to the traditional array pattern expression were proposed to account for these errors, and equations were programmed in MATLAB to perform parametric simulations to generate information regarding gain loss, beam pointing error, pattern distortions, and degradation in sidelobe levels. The objective is to aid array designers in setting acceptable tolerance limits for these types of errors.
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