Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1986-01-21
1988-06-14
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
342356, 342361, 342457, G01S 502, H04B 7185
Patent
active
047515120
ABSTRACT:
A differential navigation system applicable to mobile users and covering a wide range geographic area, including remote regions. A reference receiver of known location tracks a navigation information service, computes differential data with respect to that information and communicates the data to a transmitting unit. The transmitting unit transmits differential data via a commercial geosynchronous earth satellite relay to a mobile user located no more than 500 miles from the reference receiver, but possibly located in a remote region. The mobile user receives the relayed signal with a non-directional, circularly polarized, non-stabilized antenna. Reception at a sufficient data rate with sufficient reliability is made possible by formatting the differential data using spread spectrum techniques.
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Blum Theodore M.
Cain David
Oceanonics, Inc.
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