Method and apparatus to filter pulsed RF signals

Details Method and apparatus to filter pulsed RF signals Method and apparatus to filter pulsed RF signals

1984-02-01

1985-08-13

Safourek, Benedict V.

Pulse or digital communications

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455225, 455308, 328115, H04B 110

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active

045354600

ABSTRACT:
A method and apparatus for receiving and detecting pulsed RF signals within first frequency band. Incoming pulsed RF signals are supplied to a linear amplifier which amplifies any of the signals within a broader second frequency band. The pulsed RF output signals of the amplifier are supplied to an in-band signal detection circuit controlling switches in the outputs of a first video detector and a frequency discriminator which are also supplied with the amplifier output signals, so that output video and frequency signals are provided only for pulsed RF signals within the first frequency band. The in-band signal detection circuit includes a limiter for hard-limiting the amplifier output signals, a bandpass filter for filtering the hard-limited signals and passing those within the first frequency band, a second video detector for detecting the envelope of the filtered hard-limited signals, and a comparator for generating an control signal to close the switches at the outputs of the first video detector and the frequency discriminator whenever the detected waveform produced by the second video detector exceeds a threshold value indicating a pulsed RF signal within the first frequency band.

REFERENCES:
patent: 3218556 (1965-11-01), Chisholm
patent: 3474235 (1969-10-01), Singer
patent: 3621125 (1971-11-01), Parker
patent: 3621401 (1971-11-01), Young, Jr.
patent: 3671867 (1972-06-01), Schwarz
patent: 3953802 (1976-04-01), Morris et al.
patent: 4414512 (1983-11-01), Nelson

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