Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1991-10-04
1992-09-08
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342357, 342439, G01S 502
Patent
active
051462311
ABSTRACT:
An electronic direction finder (10), having a housing (11) with a major axis (18), has a GPS receiver (28) and directional (31) and omnidirectional (30) antennas and provides an electrical signal (angle A) indicative of the direction of the housing axis (18) with respect to a predetermined compass heading (North). The electrical signal (angle A) is provided by using determined positions of the GPS receiver (28) and one GPS satellite to calculate a compass bearing from the receiver (28) to the one satellite and using the directional antenna (31) to determine the orientation of the housing axis (18) with respect to the satellite. This eliminates using electrical output terrestrial magnetism sensing devices to sense direction finder/receiver orientation with respect to compass direction, and therefore avoids the inaccuracies and costs associated with such magnetism sensing devices.
REFERENCES:
patent: 4410890 (1983-10-01), Davis et al.
patent: 4754280 (1988-06-01), Brown et al.
patent: 4881080 (1989-11-01), Jablonski
patent: 4949268 (1990-08-01), Nishikawa et al.
U.S. application filed Jun. 3, 1991, Ser. No. 07/710,197, Lauro et al., Title "Electronic Direction Finder".
Barnea Michael
Ghaem Sanjar
Lauro George L.
Blum Theodore M.
Melamed Phillip H.
Motorola Inc.
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