Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1989-08-01
1990-12-04
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342433, G01S 504
Patent
active
049757105
ABSTRACT:
The disclosure relates to methods, algorithms and apparatus for direction-of arrival (DOA) measurement/computation based on long-baseline, phase-difference, paired-antenna interferometry and on DOA-computing array processing algorithms. Specifically, methods and algorithms based on direct, cyclically unambiguous estimation of the cosine of the DOA are described for resolving the cyclic ambiguities in long-baseline, phase-difference paired-antenna interferometers, and for steering the computations to the vicinities of the solutions in computation-intensive array processing algorithms, thereby reducing computation load and time. The invention enables the design of DOA-determination systems and radio navigation aids that combine desirable characteristics (such as high resolution and accuracy, simpilicity, low cost, self-calibration, etc.) of different methods of extracting/computing DOA data from the outputs of antenna elements that are positioned in diverse arrangements for realizing complementary apertures.
REFERENCES:
patent: 3935574 (1976-01-01), Pentheroudakes
patent: 4207572 (1980-01-01), Hipp et al.
patent: 4626859 (1986-12-01), Stansfield
patent: 4639733 (1987-01-01), King et al.
patent: 4768034 (1988-08-01), Preikschat
"New Developments in Direction-Of-Arrival Measurement Based on Adcock Antenna Clusters", Baghdady, NAECON '89, May 89.
"IDFM: A Novel Technique for Tracking, Navigation Aid and Flight Traffic Curveillance", Baghdady, NAECON '75, May 1975.
"Frequency Modulation by Synthetic Doppler: Theory and Some Novel Applications", Baghdady, NAECON '87, May 1987.
"Directional Signal Modulation by Means of Switched Spaced Antennas", Baghdady, MILCOM '87, Oct. 1987.
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