Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-11-29
1981-12-22
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 1308
Patent
active
043073972
ABSTRACT:
This invention relates to a method and apparatus for determining the distance between two positions utilizing electromagnetic waves (EMW's) and the Tellurometer principle. However, instead of utilizing a separate auxiliary EMW at the remote position for each measuring EMW transmitted from the master position a single auxiliary EMW is generated at the remote position and this single auxiliary EMW is utilized with several measuring EMW's. The measuring EMW's have frequencies that differ from that of the auxiliary EMW by similar amounts. Further, the measuring EMW's have frequencies of suitable values so that pattern frequencies and their phase shifts can be derived directly from some of the measuring EMW's and from the difference between appropriate measuring EMW's. The invention is extended, where a large number of measuring EMW's are needed to provide sufficient pattern frequencies for the degree of accuracy required, by providing a plurality of auxiliary EMW's at suitably different frequencies. All of these auxiliary EMW's are simultaneously generated and transmitted, the appropriate auxiliary EMW for a particular measuring EMW being automatically selected by filtering action at the master and remote positions.
REFERENCES:
patent: 2742638 (1956-04-01), Haywood et al.
patent: 3213449 (1965-10-01), Kobayashi et al.
patent: 3229285 (1966-01-01), Wadley
patent: 3241139 (1966-03-01), Wadley
patent: 3300780 (1967-01-01), Mason
patent: 3315257 (1967-04-01), Sauberlich
patent: 3611368 (1971-10-01), Crownover
patent: 3701151 (1972-10-01), Sato et al.
patent: 3725920 (1973-04-01), Kupfer
patent: 4072946 (1978-02-01), Kneefel
The South African Inventions Development Corporation
Tubbesing T. H.
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