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ДВУХМЕРНАЯ ТЕОРЕМА КОТЕЛЬНИКОВА С УЧЕТОМ НАПРАВЛЕНИЯ СКАНИРОВАНИЯ

ДВУХМЕРНАЯ ТЕОРЕМА КОТЕЛЬНИКОВА С УЧЕТОМ НАПРАВЛЕНИЯ СКАНИРОВАНИЯ

Abstract

The paper deals with the problem of selecting an optimum frequency separation between the receiver channels of the frequency-scanning crossed interferometer. A dependence of the frequency separation boundaries on the hour angle and declination is obtained. The study is based on the generalized Kotelnikov two-dimensional theorem taking into account the scanning direction. A radio telescope beam is considered as a space-frequency filter. It is emphasized that the transformation of a two-dimensional signal requires a two-step procedure involving discrete sampling and element-by-element quantization.

Рассматривается вопрос о выборе оптимального частотного разноса между каналами приемного устройства крестообразного интерферометра с частотным сканированием. Получена зависимость границ частотного разноса от часового угла и склонения. Исследование проведено на основе обобщенной двухмерной теоремы Котельникова с учетом направления сканирования. Диаграмма направленности радиотелескопа рассматривается как фильтр пространственных частот. Стоит подчеркнуть, что при преобразовании двухмерного сигнала прибегаем к двухступенчатой процедуре: дискретизации и поэлементному квантованию.

Keywords

РАДИОИНТЕРФЕРОМЕТР,ДВУХМЕРНЫЙ СИГНАЛ,TWO-DIMENSIONAL SIGNAL,ДИСКРЕТИЗАЦИЯ,МНОГОЧАСТОТНЫЙ ПРИЕМ,MULTIFREQUENCY RECEPTION,СЕТКА ОТСЧЕТОВ,СЕТКА ФИКСИРОВАННЫХ ЧАСТОТ,FIXED FREQUENCY GRID,RADIOINTERFEROMETER,DISCRETE SAMPLING,REFERENCE GRID

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold