Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1993-11-22
1995-09-05
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342449, G01S 144
Patent
active
054482488
ABSTRACT:
RF energy received by an antenna (10) of a radio direction finding system is evaluated for determining the presence of a RF signal transmission source at bearing values at which the received RF energy is statistically strong (33) and which have a relatively stable signal strength (35). The scanning pattern (sequence) ( 12, 15) of the antennae is altered to increase the dwell time of the antennae at bearings having a statistically strong and relatively stable signal strength combination, and decrease the percentage of time spent scanning the remainder of the 360 degree search spectrum. External sensors (30) are used to sense changes in antennae orientation with respect to a fixed reference to thereby reduce bearing errors (27) during changes in the attitude and heading of the platform carrying the radio direction finding system.
REFERENCES:
patent: 4107692 (1978-08-01), Hutcheon et al.
patent: 4229740 (1980-10-01), Krilanovich
patent: 4263597 (1981-04-01), Bentley et al.
patent: 4303922 (1981-12-01), Hoisington
patent: 4317120 (1982-02-01), Bentley et al.
patent: 4423420 (1983-12-01), Krajewski
patent: 4814779 (1989-03-01), Levine
patent: 5016019 (1991-05-01), Hawkes
patent: 5053784 (1991-10-01), Hippelainen
Blum Theodore M.
Grillo Michael
United Technologies Corporation
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