Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment
Reexamination Certificate
2000-02-03
2001-10-30
Cuchlinski, Jr., William A. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Navigation
Employing position determining equipment
C701S200000, C701S214000, C701S215000, C342S357490, C342S357490, C343S853000, C343S893000, C375S213000, C375S211000, C375S221000, 36, C455S426100, C455S411000, C455S428000, C455S437000, C455S552100, C324S331000
Reexamination Certificate
active
06311128
ABSTRACT:
TECHNICAL FIELD
The present invention relates to satellite communication systems, and more particularly, to an improved Global Position System (GPS) architecture having robust navigation capability in combination with a mobile communication network.
BACKGROUND OF THE INVENTION
The present GPS navigation network is vulnerable to signal jamming and low signal acquisition probability depending upon the environment with which the user is in. This is due primarily to the low power signals associated with present GPS navigation service. For military applications in particular, there is a need for uninterrupted GPS navigation service with robust anti-jam capability to small, hand held mobile terminals. There is also a need for integrated navigation and mobile communication services into a single such terminal.
DISCLOSURE OF THE INVENTION
Accordingly, it is an object of the present invention to provide an improved GPS network architecture having robust anti-jam capability. Another object is to provide integrated communication and navigation services to mobile user terminals.
According to the present invention, the foregoing and other objects and advantages are attained by a navigation and mobile communication satellite system comprising a Geo-Mobile (GEM) satellite (
14
) in operative communication with at least one ground segment (
12
) and at least one user segment (
16
). The GEM satellite (
14
) includes a GEM processor for providing communication and navigation services to the user segments (
16
). A plurality of Global Position System (GPS) satellites (
50
) are also in operative communication with at least one of the user segments (
16
) and at least one of the ground segments (
12
). The GPS satellites (
50
) provide navigation data to the user segment (
16
). Each of the ground segments (
12
) include a gateway station (
28
) for receiving the navigation data and processing and uplinking the navigation data to the GEM satellite (
14
) such that the processed navigation data is rebroadcast to the user segment (
16
) at a higher power than from the GPS satellites (
50
).
Other objects and advantages of the invention will become apparent upon reading the following detailed description and appended claims, and upon reference to the accompanying drawings.
REFERENCES:
patent: 4814711 (1989-03-01), Olsen et al.
patent: 5365451 (1994-11-01), Wang et al.
patent: 5552798 (1996-09-01), Dietrich et al.
patent: 5619525 (1997-04-01), Wiedeman et al.
patent: 5717830 (1998-02-01), Sigler et al.
patent: 5832379 (1998-11-01), Mallinckrodt
patent: 6067045 (2000-05-01), Castelloe et al.
Bazak, Jr. Henry V.
Bennett Pauline C.
Busche Gregory C.
Montalvo Armando
Prum Samuel
Cuchlinski Jr. William A.
Gudmestad Terje
Hughes Electronics Corporation
Mancho Ronnie
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