Differential navigation system for remote mobile users
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United States of America Patent
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Jun 14, 1988
Grant Date -
N/A
app pub date -
Jan 21, 1986
filing date -
Jan 21, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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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