04751512 is referenced by 178 patents and cites 6 patents.

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.

Title
Differential navigation system for remote mobile users
Application Number
6/821009
Publication Number
4751512
Application Date
January 21, 1986
Publication Date
June 14, 1988
Inventor
Harold L Longaker
Houston
TX, US
Agent
Vaden Eickenroht Thompson & Boulware
Assignee
Oceanonics
TX, US
IPC
H04B 7/185
G01S 5/02
View Original Source