Frequency modulated continuous wave altimeter
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United States of America Patent
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-
Jun 26, 1984
Grant Date -
N/A
app pub date -
Oct 20, 1980
filing date -
Oct 20, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A frequency modulated continuous wave altimeter and method of detecting the presence of an object in a predetermined area. The altimeter is generally comprised of an antenna for receiving and radiating microwave energy, a transmitter for generating frequency modulated microwave energy, a mixer for generating a sinusoidal resulting signal from the communication of transmitted and reflected microwave energy, and a receiver for processing the resulting signal and generating an output signal indicative of distance. The transmitter includes a Gunn diode for generating a carrier signal, modulating means for varying the frequency of the carrier signal, and a high frequency oscillator for impressing a tone on the modulating means. The receiver includes multiple staged amplifiers tuned to the frequency of the tone for selectively amplifying the resulting signal, a detector for generating a signal responsive to the inflection points on the sinusoidal resulting signal, and a counter for generating an output indicative of distance from the number of inflection points detected.
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