Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1996-02-05
1997-12-02
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342381, 342384, 455273, H01Q 322
Patent
active
056941331
ABSTRACT:
This invention relates to automatic direction finding methods and systems for an electromagnetic or acoustic signal source by utilizing the concept of adaptive nulling of a narrow or wideband signal received by one sensor from the same signal received by the other, along with appropriate adjustments, in a two-sensors-interferometer. Plurality of sensors can be used to measure two orthogonal angles of arrival of a signal. Inventive methods and devices permit singling out a particular signal of interest among others by allowing a frequency tuning and selective amplification of the particular signal of interest without destroying the differential phase or time delay between the signals received by the sensors that determine the angle measurement. A high degree of signal cancellation during the adaptive nulling process permits a correspondingly high degree of accuracy and resolution for the angle measurement and also permits a relatively short baseline for the interferometer.
REFERENCES:
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patent: 4051474 (1977-09-01), Mack et al.
patent: 4347627 (1982-08-01), Alter
patent: 4486757 (1984-12-01), Ghose et al.
patent: 4555706 (1985-11-01), Haupt
patent: 5296865 (1994-03-01), Lewis
Pham Dao L.
Tarcza Thomas H.
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