Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Transmitter
Patent
1986-09-30
1993-05-11
Swann, Tod R.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Transmitter
342200, 331 4, 331178, G01S 1332
Patent
active
052105393
ABSTRACT:
A circuit for generating an output signal having an output frequency that varies linearly with time, and to an FM CW radar system utilizing such a circuit. The circuit includes a voltage controlled oscillator that produces an output signal at its output terminal at an output frequency that corresponds to the voltage of an input tuning signal. A comparison signal circuit receives the output signal and produces a periodic comparison signal such that when the output frequency varies by .DELTA.f, the comparison signal frequency varies by .DELTA.f/N where N is a positive integer. An update counter periodically causes the value of N to change by a predetermined integer amount. A phase detector compares the comparison signal to a periodic reference signal, and produces a correction signal that is filtered to provide the tuning signal for the VCO. The value of N is preferably changed at an update frequency that is equal to the frequency of the reference signal times an integer. The comparison signal circuit preferably includes a local oscillator for converting the output signal into a periodic IF signal for input to a divider. A high side local oscillator is preferred to minimize loop gain variation with frequency.
REFERENCES:
patent: 3283254 (1966-11-01), Haynie
patent: 3364437 (1968-01-01), Loposer et al.
patent: 3375461 (1968-03-01), Ribour et al.
patent: 3382460 (1968-05-01), Blitz et al.
patent: 3383619 (1968-05-01), Naubereit et al.
patent: 3391348 (1968-07-01), Kohler
patent: 3401353 (1968-09-01), Hughes
patent: 3535651 (1970-10-01), Peterson
patent: 3579281 (1971-05-01), Kam
patent: 3597699 (1971-08-01), Selpel
patent: 3611175 (1971-10-01), Boelke
patent: 3638135 (1972-01-01), Stover
patent: 3777276 (1973-12-01), Klein
patent: 3946329 (1976-03-01), Caspari
patent: 3962653 (1976-07-01), Basset
patent: 3965438 (1976-07-01), Winston, IV
patent: 4083015 (1978-04-01), Popodi
patent: 4156205 (1979-05-01), Kadin et al.
patent: 4272729 (1981-06-01), Riley, Jr.
patent: 4342007 (1982-07-01), Elliott
patent: 4349789 (1982-09-01), Kurihara
patent: 4388597 (1983-06-01), Bickley et al.
patent: 4490688 (1984-12-01), Borras et al.
Peyton Z. Peebles, Jr., "Design of a Highly Linear Closed Loop FMCW Sweep Generator," Technical Report T-79-78, U.S. Army Missle Command, Restone Arsenal, Alabama, Aug. 8, 1979.
Swann Tod R.
The Boeing Company
LandOfFree
Linear frequency sweep synthesizer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Linear frequency sweep synthesizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear frequency sweep synthesizer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1354211