FORMATION OF A RADIATION PATTERN OF RADIO INTERFEROMETERS BY THE FREQUENCY MULTIPLICATION METHOD (FORMIROVANIE DIAGRAMMY NAPRAVLENNOSTI RADIOINTERFEROMETROV METODOM UMNOZHENIYA CHASTOTY),
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The author derives expressions for calculating the directional pattern of an N-antenna radio interferometer if the instrument operates in frequency multiplication conditions. Frequency multiplication before and after interference is considered. Several examples are examined on the basis of the resultant general expressions. It is shown that frequency multiplication may be used to constrict the directional pattern of radio telescopes and radio interferometers. However, this does not always increase the resolution. Constriction of the pattern takes place on the n-th harmonic of the signal. The sensitivity is reduced in these cases since the n-th harmonic is attenuated in comparison with the first harmonic. The signal-to-noise ratio is reduced by the loss in sensitivity. From this standpoint, frequency multiplication after interference is more advantageous than before interference.
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