Aeronautics and astronautics – Aircraft control – Automatic
Patent
1974-07-29
1976-06-01
Kunin, Stephen G.
Aeronautics and astronautics
Aircraft control
Automatic
58 31, 73178R, 23515025, 235150271, 244177, 324 4, 340 24, B64C 1318
Patent
active
039603440
ABSTRACT:
A gravity survey and aircraft guidance system comprises a pendulum clock mounted in an aircraft in level flight, having a pendulum bob with a signal sender mounted thereon. A signal receiver mounted in proxmity to the pendulum bob generates an electrical pulse at each pendulum swing. The pendulum swings in a plane having a component parallel to the east-west direction of spin of the Earth. The pendulum has a nominal oscillation frequency at a first aircraft speed with respect to the Earth's surface. The pendulum will have a second oscillation frequency at a second aircraft speed with respect to the Earth's surface due to the change in the Earth's spin-induced centrifugal force on the pendulum. Alternately, the pendulum will have a second oscillation frequency when the aircraft flies over a mass anomaly in the Earth's surface. A frequency discriminator connected to the signal receiver, generates a correction signal in response to changes in the oscillation frequency of the pendulum. In the aircraft guidance application, the control signal is applied to a servomotor to operate the aircrafts throttle, to compensate for speed variations of the aircraft. In the gravity survey application, the control signal is applied to a recorder to record the presence of mass anomalies.
REFERENCES:
patent: 2962244 (1960-11-01), Harrison
patent: 2996268 (1961-08-01), Brown et al.
patent: 3471108 (1969-10-01), Corso
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