Method and device for determination of direction

Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver

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342 56, 342108, 342147, G01S 502

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active

055129099

ABSTRACT:
A method for determining the direction to a signal source by cooperation between a first device which determines the direction to the signal source with a low angular accuracy and a second device which determines the direction to the signal source with a high angular accuracy. In a first step, the direction to the signal source is determined within a certain angular range and, through analysis of the signal transmitted from the signal source, the category of the signal source is determined. In a subsequent second step, an angular search for a signal source of said category is performed within the angular range, in which the search is interrupted in the direction in which a signal of the category is detected. In a subsequent third step, the detected signals are correlated with respect to time. When correlation is present, the direction to the signal source is determined by determination of the direction in which the signal source is detected. When correlation is not present, the search is continued until a new signal source of the category is detected, at which time the search is again interrupted and the third step is repeated. An apparatus is also disclosed.

REFERENCES:
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patent: 3947803 (1976-03-01), Brown
patent: 4028699 (1977-06-01), Stevens
patent: 4613865 (1986-09-01), Hoffman
patent: 4633261 (1986-12-01), Kosaka et al.
patent: 4888593 (1989-12-01), Friedman et al.
patent: 4891648 (1990-01-01), Jehle et al.
patent: 5061930 (1991-10-01), Nathanson et al.

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