Circuit for short duration multiple look pulse based frequency m

Details Circuit for short duration multiple look pulse based frequency m Circuit for short duration multiple look pulse based frequency m

1996-03-27

1997-08-05

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Return signal controls radar system

Receiver

342174, 342199, G01S 740

Patent

active

056547161

ABSTRACT:
A low cost automatic frequency control system measures short duration radio frequencies with high a degree of accuracy within 0.5 MHz. The system is programmable to allow applicability over a wide range of frequencies within the required accuracy and various signal durations. The system includes circuits to digitize the source signal to a digital pulse train and asynchronously sample the pulse train to obtain a count of the positive edges of the pulses over a sufficient number of samples. A microprocessor computes the statistical average of the count and accurately determines the frequency of the source signal. The system further includes a feedback path to implement correction to the source signal based on the measured frequency.

REFERENCES:
patent: 3680099 (1972-07-01), Herman et al.
patent: 4179694 (1979-12-01), Alder
patent: 4600924 (1986-07-01), Lobsinger et al.
patent: 4809004 (1989-02-01), Brandao et al.
patent: 4982195 (1991-01-01), Olivenbaum et al.
patent: 5151703 (1992-09-01), Roos

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