Communications: directive radio wave systems and devices (e.g. – With particular circuit – Automatic frequency control
Patent
1987-11-23
1989-02-28
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Automatic frequency control
342201, 331 5, 331 47, 331 88, H03B 910, G01S 702, G01S 742
Patent
active
048090042
ABSTRACT:
The invention comprises a weather radar system in which a magnetron transmitter is controlled in frequency by injecting therein a low power locking signal from a stable frequency source. Frequency lock between the source and the magnetron is maintained without requiring injection signals of excessive power by an automatic frequency control (AFC). The AFC determines the frequency and phase error between the injection signal and the magnetron output and adjusts the frequency of the source so as always to be within a narrow band of frequencies centered about the natural frequency of the magnetron. Over the long term, therefore, the frequency of the source will vary by an amount equal to the change in the natural frequency of the magnetron occurring during that time. Over the short term, however, the difference in frequency between the injection signal and the magnetron output is zero, while the phase difference is less than 90.degree.. The frequency source controlling the magnetron also serves as a frequency source for generating the several local oscillator frequencies required by the system receiver. Thus, the pulse to pulse transmitted signals, return signals and receiver i.f. signals all possess a high degree of phase coherence, readily permitting detection and determination of the doppler frequencies contained in the return signals.
REFERENCES:
patent: 2820197 (1958-01-01), Donal, Jr.
patent: 3290678 (1966-12-01), Carlsson
patent: 3358282 (1967-12-01), Wasterlid
patent: 3555447 (1971-01-01), Bonfeld et al.
patent: 3851271 (1974-11-01), Cooke et al.
Skolnik, Radar Handbook, 1970, McGraw-Hill, pp. 5-15 and 5-39.
L. N. Redinour, Radar System Engineering: McGraw-Hill 1947, pp. 632-638.
Baran Henri
Brandao Ruy L.
Manseur Arezki
Sweet Steven R.
Allied-Signal Inc.
Barron Jr. Gilberto
Massung Howard G.
Tarcza Thomas H.
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