Communications: directive radio wave systems and devices (e.g. – Radar ew
Patent
1985-01-07
1988-03-22
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Radar ew
455226, 342201, G01S 736
Patent
active
047332379
ABSTRACT:
A device for determining the frequency range and chirp rate of chirp radars or other sources of frequency-modulated signals includes a compressive receiver (16, 22, 24) for time-compressing single-frequency signals and a discriminator (26) for generating an output that represents the instantaneous frequency of the compressive-receiver output. For narrow-band signals, the frequency-modulated components in the output of the compressive receiver do not last long enough to cause a response from the discriminator (26). When the input of the compressive receiver is a chirp signal, on the other hand, the resultant compressive-receiver output lasts long enough to cause a discriminator response, and its time of occurrence and rate of frequency change are indications of the frequency range and chirp rate of the compressive-receiver input. The discriminator (26) accordingly generates an output whose slope is an indication of the chirp rate of the compressive-receiver input.
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Apostolos John T.
Stromswold Chester E.
Sanders Associates Inc.
Seligman Richard I.
Sotomayor John B.
Tubbesing T. H.
Weinstein Stanton D.
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