Communications: directive radio wave systems and devices (e.g. – With particular circuit – Automatic frequency control
Patent
1989-11-27
1992-04-21
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Automatic frequency control
342201, 331 5, 331 22, 331 47, G01S 703, H03B 910, H03L 7087
Patent
active
051072726
ABSTRACT:
A radar transmitter chain employing injection locked oscillator, e.g., a magnetron, as an output stage. Problems arise with maintaining the injection locking bandwidth centered on the radar source transmit frequency. This alignment is maintained by allowing the magnetron (38) free running frequency to drift, along with its injection locking bandwidth and then to force the radar source frequency (30) to follow the magnetron frequency. A phase difference measurement (44) between the injection signal (35) and the magnetron output signal (37) provides the control for a feedback loop (60) which may control a tunable VCO (48) or selection from a bank of fixed frequency oscillators (78).
REFERENCES:
patent: 2820197 (1958-01-01), Donul, Jr.
patent: 2860246 (1958-11-01), Jakubowics
patent: 3290678 (1966-12-01), Carlsson
patent: 3358282 (1967-12-01), Wasterlid
patent: 4472718 (1984-09-01), Ohashi et al.
patent: 4547775 (1985-10-01), Wehner et al.
patent: 4809004 (1989-02-01), Brandao et al.
patent: 4912432 (1990-03-01), Galani et al.
Joynson David W.
White Ian J.
Barron Jr. Gilberto
The Marconi Company Limited
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