Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1979-04-06
1981-06-23
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 172PC, G01S 302
Patent
active
042753988
ABSTRACT:
A radio locator system uses transceivers located in a mobile and at least two stationary stations. Each stationary station serves as one end of a surveyor's baseline. Therefore, since the transceivers are located at opposite ends of a line having a known length, their broadcast signals provide direct distance measurements of two other lines extending between the individual stationary stations and the mobile unit, thereby cooperating with the known line to complete a trilateralization. Each station in the system is identified by a uniquely encoded stream of pulse bursts, each burst encompassing a wide, preprogrammed change of frequency for eliminating interference between the signals used in the locator system and the signals of other users of the same frequency band. An inversion of the preprogrammed frequency change is used for the return of the ranging system signal in order to substantially eliminate or suppress echo returns to the mobile or interrogator station. The sound of the preprogrammed station identifying frequency changes is sometimes called "chirping".
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patent: 3553691 (1971-01-01), Lassiter
patent: 3654554 (1972-04-01), Cook
patent: 3810179 (1974-05-01), Merrick
patent: 3875571 (1975-04-01), Davis, Jr. et al.
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G. Burkland, New Technology Promises Improved Navigational Systems for Seismic Ships, Offshore Magazine, 1976, pp. 228, 231, 232.
Davidson Harry T.
Parker William H.
Blum Theodore M.
Del Norte Technology, Inc.
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