Multiple access satellite communications network

• US 5,940,739 A
• Filed: 10/24/1997
• Issued: 08/17/1999
• Est. Priority Date: 10/24/1997
• Status: Expired due to Fees

• Current Assignee: SSC Space U.S., Inc. (Government of Sweden)
• Original Assignee: SSC Space U.S., Inc. (Government of Sweden)
• Inventors: Conrad, Charles, Massey, David Earl, Ingersoll, Thomas Ray, Glim, Carl Joseph
• Primary Examiner(s): VO, NGUYEN THANH
• Application Number:
  US08/957,643
• Time in Patent Office: 662 Days
• Field of Search: 455/12.1, 455/13.1, 455/3.2, 455/427, 455/430, 455/426
• US Class Current: 455/13.1
• CPC Class Codes: H04B 7/18519 Operations control, administration or maintenance

Abstract

The present invention relates to a means and a process of sharing a single system of ground stations between any number of satellite owners, permitting the owners to transfer command information to their satellite, and collect data streams that are sent back from the satellite all via a standardized global communications system maintained and operated by a commercial satellite communications company.

Claims

1. A shared communication apparatus for communicating user data between a plurality of independent satellite users and their respective orbiting satellites, said apparatus comprising:

a) a user interface, one for each of the plurality of independent satellite users, gathering user data to be transmitted to a user selectable one of the plurality of orbiting satellites from one of the plurality of independent satellite users;

b) a central controller coupled to the user interface, receiving the user data to be transmitted, interacting with the one of the plurality of independent satellite users via the user interface to enable the one of the plurality of independent satellite users to control the satellite to which the user data is to be transmitted and/or satellite data is to be received, to determine a time at which the user data is to be transmitted and/or satellite data is to be received,

c) a plurality of remote ground stations, each ground station having;

(i) a transmitter receiving the user data to be transmitted, transmitting the user data to the user selectable one of the plurality of orbiting satellites, and

(ii) a receiver receiving the satellite data for the one of the plurality of independent satellite users from the user selectable one of the plurality of satellites, and communicating the satellite data to the user interface or the central controller, wherein the central controller interacts with the one of the plurality of independent satellite users to control from which of the plurality of remote ground stations the user data is to be transmitted and/or satellite data is to be received; and

d) a communications network maintaining communications between said user interface, said central controller, and said plurality of remote ground stations via which the satellite data and the user data is transmitted to and from the plurality of independent satellite users and the plurality of remote ground stations.

2. The shared apparatus according to claim 1, wherein the user interface comprises a graphical user interface.

3. The shared communications apparatus according to claim 1, wherein central controller includes a computer.

4. The shared communications apparatus according to claim 1, wherein said communications network comprises a public switched telephone network, which is used for low priority and small sized transmissions, and a frame relay transmission network, which is used for large packets of data being transmitted in real time.