База сигнала

База сигнала — это произведение эффективного значения длительности сигнала и эффективного значения ширины его спектра :

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В простых случаях за эффективную ширину спектра можно принять ширину главного лепестка спектра. Длительность сигнала и ширина его спектра подчиняются соотношению неопределенности, гласящему, что база сигнала не может быть меньше единицы. Ограничений на максимальное значение базы сигнала не существует. То есть короткий сигнал с узким спектром существовать не может, а бесконечный сигнал с широким спектром — может (так называемый широкополосный сигнал, сигнал с большой базой). Примерами такого рода могут служить ЛЧМ-сигнал или Белый шум.

Литература

  • Радиотехнические цепи и сигналы. Автор:Баскаков С. И. 1988, 446 страниц.

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