Method and apparatus for quantitatively measuring the reception quality of a received frequency-modulated ultrashort-wave signal
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United States of America Patent
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Aug 5, 1980
Grant Date -
N/A
app pub date -
Apr 10, 1979
filing date -
May 28, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A frequency-modulated ultrashort-wave signal is received, but due to wave-reflection phenomena from physical bodies reflecting towards the receiving antenna is amplitude modulated, this amplitude modulation being dependent upon frequency. An amplitude-indicating signal and a frequency-deviation signal are derived from the received frequency-modulated signal and, instead of merely being applied to the x-and y-deflection inputs of an oscilloscope for partly subjective analysis by a skilled analyst, are applied, preferably via low-pass filters, to first and second differentiators, the two output signals of which are transmitted to a divider which produces a differential-quotient signal indicating the rate of change of the amplitude of the frequency-modulated signal with respect to the frequency deviation of the frequency-modulated signal. The differential-quotient signal is applied to an extreme-value-responsive indicator, whose read-out constitutes a direct quantitative measure of reception quality which can be used, for example, to automatically steer the receiving antenna.
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