PRECISION TIME OR FREQUENCY TRANSMISSION TO MOVING VEHICLES
AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA
Pagination or Media Count:
A circuit is described which is capable of transmitting the output of an ultra-stable oscillator or clock with an e9tremely high degree of accuracy to a moving vehicle. First order Doppler frequency shift of the form fvc, as caused by the velocity of the vehicle rela tive to the transmitting station, is cancelled, while second-order Doppler is largely eliminated. Because of these features, the circuit makes application of very stable frequency sources to vehicle electronic systems possible to degrees of stability which could previously not be achieved or even approached by several orders of magnitude. Applications of the circuit include radio navigation, guidance, and tracking, as well as data transmission, telemetry, and possibly communications involving earth satellites, moon satellites, and interplanetary and other space vehicles.
- Radio Communications