Method for identifying growth limits of handheld services for mobile satellite communications

• US 6,501,941 B1
• Filed: 11/02/1999
• Issued: 12/31/2002
• Est. Priority Date: 03/23/1999
• Status: Expired due to Term

• Current Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Original Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Inventors: Chang, Donald C. D., Chang, Ming U., Novak, John I. III, Yung, Kar W., Taormina, Frank A., Von Der Embse, Urban A., Cheng, David C.
• Primary Examiner(s): Chang, Vivan
• Assistant Examiner(s): RAMOS FELICIANO, ELISEO
• Application Number:
  US09/432,440
• Publication Number:
  US 20030022623A1
• Time in Patent Office: 1,155 Days
• Field of Search: 455/11.1, 455/12.1, 455/13.1, 455/13.2, 455/13.3, 455/13.4, 455/427, 455/428, 455/429, 455/430
• US Class Current: 455/13.1
• CPC Class Codes: B64G 1/1007 Communications satellites
• CPC Class Codes: B64G 1/242 Orbits and trajectories
• CPC Class Codes: H04B 7/18519 Operations control, administration or maintenance

Abstract

Methods for increasing the efficiency of satellite constellation operations are disclosed. The steps of the present invention comprise calculating the maximum number of communications signals that each satellite in the satellite constellation can generate, determining an operational constraint on each satellite, the operational constraint limiting the number of communications signals that each satellite can radiate substantially simultaneously, determining an operational space for each satellite wherein the operational space is defined using the operational constraint and the calculated number of signals, and using the operational space for each satellite in the constellation to determine the operational point for the constellation.

Claims

1. A method for determining an operational point for a satellite constellation, comprising the steps of:

calculating the maximum number of communications signals that each satellite in the satellite constellation can generate;

determining an operational constraint on each satellite, the operational constraint limiting the number of communications signals that each satellite can radiate substantially simultaneously;

determining an operational space for each satellite wherein the operational space is defined using the operational constraint and the calculated number of signals; and

using the operational space for each satellite in the constellation to determine the operational point for the satellite constellation.

2. The method of claim 1, wherein each satellite in the satellite constellation is in Middle Earth Orbit (MEO).

3. The method of claim 1, further comprising the step of using a communications channel to communicate with multiple communications devices substantially simultaneously.

4. The method of claim 1, wherein the operational space determines a maximum number of signals that each satellite can radiate substantially simultaneously without interference.

5. The method of claim 4, wherein the operational space determines a preferred number of satellites to be used in the satellite constellation.

6. A method for operating a satellite at an increased efficiency, comprising the steps of:

calculating the maximum number of communications signals that the satellite can generate for a first communications service;

determining an operational constraint on the satellite, the operational constraint limiting the number of communications signals that the satellite can radiate substantially simultaneously for the first communications service;

defining a second communications service, the second service using the same communications signals as the first communications service;

determining an operational space for the communications signals, the operational space defined using the first and the second communications services and the operational constraint; and

determining the increased efficiency for the satellite using the operational space.

7. The method of claim 6, wherein the satellite is in Middle Earth Orbit.

8. The method of claim 6, wherein the operational constraints are selected as one or more elements selected from a group comprising power limitation, available subbands, available channels, and data rate requirements.

9. The method of claim 6, wherein the increased efficency operational point is determined using at least one element selected from a group comprising revenue generation, bandwidth availability, available power, number of users within a region, and available subbands.

10. The method of claim 6, wherein the step of creating the operational space generates an operational space for a satellite constellation comprising the satellite.

11. A satellite constellation, operated by performing the steps of:

calculating the maximum number of communications signals that each satellite in the satellite constellation can generate;

determining an operational constraint on each satellite, the operational constraint limiting the number of communications signals that each satellite can radiate substantially simultaneously;

determining an operational space for each satellite wherein the operational space is defined using the operational constraint and the calculated number of signals; and

using the operational space for each satellite in the constellation to determine the operational point for the satellite constellation.