Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1974-03-08
1976-10-26
Tubbesing, T.H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
23515027, 343112D, G01S 514
Patent
active
039887340
ABSTRACT:
A method of and system for locating a position in which a plurality of frequency standard devices are synchronized or phase compared at the same initial location. Two of three frequency standard devices, in a two-dimensional embodiment, are placed at transmitting stations on a known baseline. The third device is at a (third) receiving station, which receives signals from the two transmitting stations. At each transmitting station, means are provided for producing and transmitting a different radio frequency carrier signal of fixed frequency and of fixed phase, phase modulated by a periodic modulating signal in the form of a time signal produced under the control of its frequency standard device. At the receiving station, means are provided for producing a reference signal corresponding to the periodic modulating signals and two radio frequency signals related in frequency, to the radio frequency carrier signals transmitted. The time reference signal is compared at the receiving station with the periodic modulating signals recovered from the radio frequency carriers to determine respective time differences representing coarse position data. The phase relationships between each of the received radio frequency carrier signals or of signals derived therefrom by mixer means and respective ones of the two radio frequency signals produced at the receiving station are determined, representing fine position data. Methods and systems for locating a position in three dimensions are also described. The fine ranges, distances within given lanes, are respectively added by a computer or an internal computing circuit to respective coarse ranges, each of which represents the total number of lanes to the full lane closest to respective ones of the transmitting stations, the totals being the distances between the receiving station and each of the transmitting stations.
REFERENCES:
patent: 2036165 (1936-03-01), Usselman
patent: 3797015 (1974-03-01), Elwood
Berger Richard E.
Tubbesing T.H.
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