Apparatus and method to implement a flexible hub-spoke satellite communications network

• US 6,973,287 B2
• Filed: 01/11/2002
• Issued: 12/06/2005
• Est. Priority Date: 01/11/2002
• Status: Expired due to Term

• Current Assignee: Northrop Grumman Systems Corporation (Northrop Grumman Corporation)
• Original Assignee: Northrop Grumman Corporation
• Inventors: Franzen, Daniel R., Lane, Daniel R., DiCamillo, Nicholas F.
• Primary Examiner(s): Maung, Nay
• Assistant Examiner(s): DEAN, RAYMOND S
• Application Number:
  US10/044,131
• Publication Number:
  US 20030134592A1
• Time in Patent Office: 1,425 Days
• Field of Search: 455/12.1, 455/13.1, 455/17, 455/22, 455/67.4, 455/13.3, 455/67.5, 455/67.11, 455/67.14, 455/428, 455/430, 455/427, 455/429, 342/368, 342/374, 342/372, 343/757, 370/316, 244/158.R
• US Class Current: 455/12.1
• CPC Class Codes: H04B 7/18519 Operations control, administration or maintenance
• CPC Class Codes: H04B 7/2041 Spot beam multiple access

Abstract

A multi-beam satellite comprises an input section receiving a plurality of first spot beams and an output section transmitting a plurality of second spot beams. A payload architecture is coupled between the input section and output section. It flexibly and selectively switches and filters the first plurality of spot beams received by the input section and provides signals to the output section to be transmitted as the second plurality of spot beams.

Claims

1. A multi-beam satellite comprising:

an input section to receive a plurality of first spot beams via a plurality of uplink antennas, each of the plurality of uplink antennas being repositionable to receive a test signal transmitted from a single earth station;

an output section to transmit a plurality of second spot beams via a plurality of downlink antennas, each of the plurality of downlink antennas being repositionable to retransmit the test signal to the single earth station; and

a payload architecture coupled between said input section and said output section, said payload architecture flexibly and selectively power dividing, switching and filtering signals from said plurality of first spot beams received by said input section and routing the signals to said output section to be transmitted as said plurality of second spot beams, said payload architecture being operative to select any of the plurality of first spot beams to contain a gateway.

2. The satellite of claim 1, wherein said payload architecture switches to select one of said plurality of first spot beams received by said input section to contain a gateway.

3. The satellite of claim 2, wherein said plurality of first spot beams includes a plurality of primary beams and a plurality of secondary beams.

4. The satellite of claim 2, wherein said payload architecture allocates return channels among said plurality of first spot beams by switching and filtering of said plurality of first spot beams.

15. The multi-beam satellite of claim 1, wherein said power dividing is performed through a plurality of power dividers such that a given signal from said plurality of first spot beams is routed to a plurality of switching devices.

16. The multi-beam satellite of claim 15, wherein the power dividers comprise at least one of a plurality of 1:

3 power dividers and 1;

2 power dividers.

17. The multi-beam satellite of claim 1, further comprising an inverse multiplexer operative to receive power divided and switched signals from the plurality of first spot beams and combine them into a first combined signal, wherein the first combined signal is transmitted from the output section to a gateway ground cell.

18. The multi-beam satellite of claim 17, wherein the gateway ground cell is covered by one of the second spot beams.

19. The multi-beam satellite of claim 2, wherein the gateway is operative to generate an uplink signal and monitor a downlink signal corresponding to the uplink signal for the purposes of testing.

5. A multi-beam satellite comprising:

an input section to receive uplink signals from a plurality of first spot beams via any one of a plurality of uplink antennas;

an output section to transmit a plurality of second spot beams via any one of a plurality of downlink antennas; and

a payload architecture coupled between said input section and said output section, said payload architecture flexibly and selectively switching and filtering said plurality of first spot beams received at said input section and routing the switched and filtered plurality of second spot beams transmitted by said output section so as to perform testing of each of said plurality of first spot beams and each of said plurality of second spot beams;

wherein said payload architecture selectively switches said plurality of first spot beams to allow any uplink signal to act as a gateway signal for purposes of testing.

6. The satellite of claim 5, wherein said testing is performed using test signals from a single ground station.

7. The satellite of claim 5, wherein said payload architecture allows connectivity, for test purposes only, of one of said plurality of second spot beams corresponding to a cell with one of said plurality of first spot beams corresponding to said cell.

8. The satellite of claim 6, wherein said testing operates in conjunction with a control system to reposition at least one first antenna and least one second antenna so that each one of said plurality of first spot beams and said plurality of second spot beams can be tested from said single ground station.

9. The satellite of claim 5, wherein said plurality of first spot beams includes spot beams corresponding to primary cells and secondary cells, the payload architecture being operative to select any of the primary cells to contain a gateway.

10. The satellite of claim 9, wherein said testing includes testing of first spot beams corresponding to a secondary cell.

20. The multi-beam satellite of claim 5, further comprising a plurality of 1:

3 power dividers operative to route any of the uplink signals to any of the plurality of second spot beams, such that any uplink signal can act as a gateway beam for purposes of testing.

21. The multi-beam satellite of claim 5, wherein performance of the plurality of first and second spot beams is tested by re-pointing a satellite antenna structure in a scan pattern.

11. A method of testing a multi-beam satellite, said method comprising:

receiving a plurality of first spot beams at said satellite via any one of a plurality of uplink antennas;

transmitting a plurality of second spot beams from said satellite via any one of a plurality of downlink antennas;

switching said plurality of first spot beams to allow connectivity of a first spot beam in a cell with a second spot beam in said cell; and

sending a test signal from a single ground station on said first spot beam and receiving the test signal at said second spot beam to test said first spot beam and said second spot beam;

wherein any one of said plurality of first spot beams can act as a gateway for the purposes of testing said first spot beam and said second spot beam.

12. The method of claim 11, further comprising repeating said step of sending a test signal for each one of said plurality of first spot beams and each one of said plurality of second spot beams from said single ground station.

13. The method of claim 12, wherein said satellite comprises a first antenna or antenna set receiving said plurality of first spot beams and a second antenna or antenna set transmitting said plurality of second spot beams, and said first antenna or antenna set and said second antenna or antenna set are repositioned for each pair of one of said plurality of first spot beams and one of said plurality of second spot beams corresponding to a cell.

14. The method of claim 12, wherein said satellite comprises one or more shared antenna apertures receiving said plurality of first spot beams and transmitting said plurality of second spot beams, and said shared antenna aperture is repositioned for each pair of one of said plurality of first spot beams and one of said plurality of second spot beams corresponding to a cell.