Frequency control for frequency agile pulse radar

Details Frequency control for frequency agile pulse radar Frequency control for frequency agile pulse radar

1976-04-16

1978-01-31

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5AF, G01S 902, G01S 728

Patent

active

040718441

ABSTRACT:
An automatic frequency control for causing a local oscillator to track the frequency of a transmitter such that the received echo of a transmitted pulse may be combined with the output of the local oscillator in a mixer to provide an intermediate frequency signal which is suitable for amplification, filtering and detection operations. The automatic frequency control includes an average frequency control loop for determining the average frequency of the local oscillator output signal, an electromechanical frequency transducer cooperating with a sample and hold circuit for providing a modulating signal to modulate the average frequency of the local oscillator output signal in response to the frequency of the next pulse to be provided by the transmitter, and a modulation gain control loop for controlling the gain of the modulating signal to compensate for variations in the transfer functions of the electromechanical frequency transducer and the sample and hold circuit.

REFERENCES:
patent: 2798946 (1957-07-01), Howery et al.
patent: 2852669 (1958-09-01), Ashby
patent: 3372391 (1968-03-01), Lerner
patent: 3611380 (1971-10-01), Carlsson
patent: 3858219 (1974-12-01), Hull
patent: 3979752 (1976-09-01), Charlot

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