Satellite beamforming

• US 9,848,370 B1
• Filed: 03/15/2016
• Issued: 12/19/2017
• Est. Priority Date: 03/16/2015
• Status: Active Grant

• Current Assignee: RKF Engineering Solutions, LLC
• Original Assignee: RKF Engineering Solutions, LLC
• Inventors: Freedman, Jeffrey, Markley, Scott Conrad, Halvorson, Erik, Berman, Arnold
• Primary Examiner(s): Nguyen, Hai V
• Application Number:
  US15/070,362
• Time in Patent Office: 644 Days
• Field of Search: 455 121
• CPC Class Codes: H04B 17/102 Power radiated at antenna
• CPC Class Codes: H04B 7/18515 Transmission equipment in satellites or space-based relays
• CPC Class Codes: H04B 7/2041 Spot beam multiple access
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 84/06 Airborne or Satellite Networks space-based or airborne stations H04B7/185

Abstract

A beam former processor receives a group of signals for transmission through the plurality of amplifiers, wherein the group of signals is less than a total number of feeds in an antenna array. The beam former processor determines terrestrial regions for transmitting the group of signals. The beam former processor identifies a subset of feeds that are configured to form beams covering the terrestrial regions. The beam former processor controls the switching circuitry to route the group of signals from the plurality of amplifiers to the subset of feeds through the switching circuitry, such that the subset of feeds are enabled to form beams that cover the terrestrial regions based on the group of signals.

Claims

1. An apparatus comprising:

a plurality of amplifiers configured to output amplified signals;

an array of feeds configured to form beams based on the amplified signals, wherein a total number of feeds in the array is greater than a total number of amplifiers in the plurality of amplifiers;

a switching circuitry configured to route the amplified signals to a subset of feeds in the array; and

a beam former processor configured to perform operations comprising;

receiving, at a first time, a first group of signals for transmission through the plurality of amplifiers, wherein the first group of signals is less than a total number of feeds in the array;

determining first terrestrial regions for transmitting the first group of signals;

identifying a first subset of feeds that are configured to form beams covering the first terrestrial regions; and

controlling the switching circuitry to route the first group of signals from the plurality of amplifiers to the first subset of feeds through the switching circuitry, such that the first subset of feeds are enabled to form beams that cover the first terrestrial regions based on the first group of signals.

2. The apparatus of claim 1, wherein identifying the first subset of feeds comprises:

identifying feeds equal in number to the first group of signals such that the beams formed by the identified feeds are configured to cover the first terrestrial regions with signal level above a predetermined threshold.

3. The apparatus of claim 2, wherein the signal level includes at least one of signal power or signal gain.

4. The apparatus of claim 1, wherein controlling the switching circuitry to route the first group of signals comprises:

selecting, in the switching circuitry, a first group of switches that are configured to connect the plurality of amplifiers to the first subset of feeds; and

activating the first group of switches such that the first group of signals are routed from the plurality of amplifiers to the first subset of feeds through the first group of switches without routing the signals to other feeds outside the first subset of feeds.

5. The apparatus of claim 4, wherein a total number of switches in the switching circuitry equals the total number of feeds in the array, and wherein routing the first group of signals through the first group of switches comprises:

for each signal, determining one or more switches that forms a forwarding path from an amplifier outputting the signal to a feed element identified for beamforming using the signal, wherein the determining is performed such that switches forming forwarding paths for every signal in the first group of signals are determined.

6. The apparatus of claim 4, wherein the plurality of amplifiers are grouped into rings of amplifiers, each ring associated with a known subset of amplifiers in the plurality of amplifiers and a known subset of switches in the switching circuitry.

7. The apparatus of claim 6, wherein the known subset of switches associated with a ring are configured to route signals output by the known subset of amplifiers associated with the ring to a known subset of feeds.

8. The apparatus of claim 6, wherein the known subset of switches are preconfigured to receive signals from amplifiers associated with one or more known rings.

9. The apparatus of claim 1, wherein the beam former processor is configured to perform operations further comprising:

receiving, at a second time, a second group of signals for transmission through the plurality of amplifiers, wherein the second group of signals is less than a total number of feeds in the array;

determining second terrestrial regions for transmitting the second group of signals;

identifying a second subset of the feeds that are configured to form beams covering the second terrestrial regions; and

controlling the switching circuitry to route the second group of signals from the plurality of amplifiers to the second subset of the feeds through the switching circuitry such that the second subset of the feeds are enabled to form beams that cover the second terrestrial regions based on the second group of signals.

10. The apparatus of claim 9, wherein the second group of signals are distinct from the first group of signals, the second terrestrial regions are distinct from the first terrestrial regions and the second subset of the feeds are distinct from the first subset of feeds and the configuration of the switching circuitry to route the second group of signals is different from the configuration of the switching circuitry to route the first group of signals.

11. The apparatus of claim 1, wherein the apparatus includes a beamforming satellite.

12. An apparatus comprising:

a plurality of amplifiers configured to output amplified signals;

an array of feeds configured to form beams based on the amplified signals;

a plurality of hybrid matrices, each hybrid matrix configured to perform operations comprising;

receiving one or more amplified signals at input ports from one or more amplifiers;

forwarding a received signal to an individual feed coupled to an output port of the hybrid matrix in a first configuration of matrix circuitry; and

forwarding a received signal to a group of feeds coupled to output ports of the hybrid matrix in a second configuration of the matrix circuitry; and

a beam former processor configured to perform operations comprising;

receiving, at a first time, a first group of signals for transmission through the plurality of amplifiers;

determining first terrestrial regions for transmitting the first group of signals;

identifying a first subset of feeds that are configured to form beams covering the first terrestrial regions;

determining whether all first terrestrial regions are covered by beams formed using the first subset of feeds;

based on determining that all first terrestrial regions are not covered by beams formed using the first subset of feeds, determining a subset of the first terrestrial regions for covering by grouping feeds;

identifying, from the first subset of feeds, a second subset of feeds that are configured to form beams covering the subset of the first terrestrial regions;

controlling hybrid matrices coupled to the second subset of feeds to group, in each hybrid matrix using the second configuration of the matrix circuitry, feeds that are coupled to the hybrid matrix and forwarding a respective received signal to the grouped feeds; and

controlling hybrid matrices coupled to remaining feeds in the first subset of feeds to forward, in each hybrid matrix using the first configuration of the matrix circuitry, a respective received signal to an individual feed coupled to the hybrid matrix that is one of the remaining feeds in the first subset of feeds,

wherein the second subset of feeds and the remaining feeds in the first subset of feeds are enabled to form beams that cover the first terrestrial regions based on receiving the first group of signals from respective hybrid matrices.

13. The apparatus of claim 12, wherein each amplifier is coupled to an input port of a single hybrid matrix, and wherein identifying the first subset of feeds comprises:

for each amplifier, identifying feeds that are coupled to output ports of the hybrid matrix associated with the amplifier, and selecting one of the identified feeds for receiving the signal output by the amplifier.

14. The apparatus of claim 13, wherein determining whether all first terrestrial regions are covered by beams formed using the first subset of feeds comprises:

determining whether the beams formed using the first subset of feeds can transmit the signals to the first terrestrial regions with signal level above a predetermined threshold.

15. The apparatus of claim 14, wherein the signal level includes at least one of signal power or signal gain.

16. The apparatus of claim 14, wherein determining the subset of the first terrestrial regions for covering by grouping feeds comprises:

determining one or more of the first terrestrial regions that are lower in priority than remaining first terrestrial regions, such that signals can be transmitted to the one or more of the first terrestrial regions that are lower in priority with lower signal level compared to signals that are transmitted to remainder of the first terrestrial regions,

wherein the lower signal level is above the predetermined threshold.

17. The apparatus of claim 12, wherein the beam former processor is configured to perform operations further comprising:

receiving, at a second time, a second group of signals for transmission through the plurality of amplifiers;

determining second terrestrial regions for transmitting the second group of signals;

identifying a third subset of feeds that are configured to form beams covering the second terrestrial regions;

determining whether all second terrestrial regions are covered by beams formed using the third subset of feeds;

based on determining that all second terrestrial regions are not covered by beams formed using the third subset of feeds, determining a subset of the second terrestrial regions for covering by grouping feeds;

identifying, from the third subset of feeds, a fourth subset of feeds that are configured to form beams covering the subset of the second terrestrial regions;

controlling hybrid matrices coupled to the fourth subset of feeds to group, in each hybrid matrix using the second configuration of the matrix circuitry, feeds that are coupled to the hybrid matrix and forwarding a respective received signal to the grouped feeds; and

controlling hybrid matrices coupled to remaining feeds in the second subset of feeds to forward, in each hybrid matrix using the first configuration of the matrix circuitry, a respective received signal to an individual feed coupled to the hybrid matrix that is one of the remaining feeds in the second subset of feeds,

wherein the third subset of feeds and the remaining feeds in the second subset of feeds are enabled to form beams that cover the second terrestrial regions based on the second group of signals.

18. The apparatus of claim 17, wherein the second group of signals are distinct from the first group of signals, the second terrestrial regions are distinct from the first terrestrial regions, the third subset of feeds are distinct from the first subset of feeds and the fourth subset of feeds are distinct from the second subset of feeds.

19. The apparatus of claim 12, wherein the apparatus includes a beamforming satellite.

20. An apparatus comprising:

a plurality of amplifiers configured to output amplified signals;

an array of feeds configured to form beams based on the amplified signals, wherein a total number of feeds in the array is greater than a total number of amplifiers in the plurality of amplifiers;

a switching circuitry configured to route the amplified signals to a subset of feeds in the array;

a plurality of hybrid matrices, each hybrid matrix configured to perform operations comprising;

receiving one or more amplified signals at input ports from one or more amplifiers through the switching circuitry;

forwarding a received signal to an individual feed coupled to an output port of the hybrid matrix in a first configuration of matrix circuitry; and

forwarding a received signal to a group of feeds coupled to output ports of the hybrid matrix in a second configuration of the matrix circuitry; and

a beam former processor configured to perform operations comprising;

receiving, at a first time, a first group of signals for transmission through the plurality of amplifiers, wherein the first group of signals is less than a total number of feeds in the array;

determining first terrestrial regions for transmitting the first group of signals;

identifying a first subset of feeds that are configured to form beams covering the first terrestrial regions;

determining whether all first terrestrial regions are covered by beams formed using the first subset of feeds;

based on determining that all first terrestrial regions are not covered by beams formed using the first subset of feeds, determining a subset of the first terrestrial regions for covering by grouping feeds;

identifying, from the first subset of feeds, a second subset of feeds that are configured to form beams covering the subset of the first terrestrial regions;

controlling the switching circuitry to route the first group of signals from the plurality of amplifiers to a first group of hybrid matrices coupled to the first subset of feeds through the switching circuitry;

controlling a subset of the first group of hybrid matrices that are coupled to the second subset of feeds to group, in each hybrid matrix using the second configuration of the matrix circuitry, feeds that are coupled to the hybrid matrix and forwarding a respective received signal to the grouped feeds; and

controlling a remainder of the first group of hybrid matrices that are coupled to remaining feeds in the first subset of feeds to forward, in each hybrid matrix using the first configuration of the matrix circuitry, a respective received signal to an individual feed coupled to the hybrid matrix that is one of the remaining feeds in the first subset of feeds,

wherein the second subset of feeds and the remaining feeds in the first subset of feeds are enabled to form beams that cover the first terrestrial regions based on receiving the first group of signals from respective hybrid matrices.

21. The apparatus of claim 20, wherein identifying the first subset of feeds comprises:

identifying feeds equal in number to the first group of signals such that the beams formed by the identified feeds are configured to cover the first terrestrial regions with signal level above a predetermined threshold.

22. The apparatus of claim 21, wherein the signal level includes at least one of signal power or signal gain.

23. The apparatus of claim 20, wherein controlling the switching circuitry to route the first group of signals comprises:

selecting, in the switching circuitry, a first group of switches that are configured to connect the plurality of amplifiers to the first group of hybrid matrices; and

activating the first group of switches such that the first group of signals are routed from the plurality of amplifiers to the first group of hybrid matrices through the first group of switches without routing the signals to other hybrid matrices outside the first group of hybrid matrices.

24. The apparatus of claim 23, wherein a total number of switches in the switching circuitry equals the total number of feeds in the array, and wherein routing the first group of signals using the first group of switches comprises:

for each signal, determining one or more switches that forms a forwarding path from an amplifier outputting the signal to a hybrid matrix coupled to a feed element identified for beamforming using the signal, wherein the determining is performed such that switches forming forwarding paths for every signal in the first group of signals are determined.

25. The apparatus of claim 23, wherein the plurality of amplifiers are grouped into rings of amplifiers, each ring associated with a known subset of amplifiers in the plurality of amplifiers and a known subset of switches in the switching circuitry.

26. The apparatus of claim 25, wherein the known subset of switches associated with a ring are configured to route signals output by the known subset of amplifiers associated with the ring to a known subset of hybrid matrices coupled to a known subset of feeds.

27. The apparatus of claim 26, wherein the known subset of hybrid matrices are preconfigured to receive signals from amplifiers associated with one or more known rings.

28. The apparatus of claim 20, wherein each amplifier is coupled to an input port of one or more hybrid matrices, and wherein identifying the first subset of feeds comprises:

for each amplifier, identifying a feed for receiving the signal output by the amplifier, and determining a hybrid matrix that is coupled to the identified feed.

29. The apparatus of claim 20, wherein determining whether all first terrestrial regions are covered by beams formed using the first subset of feeds comprises:

determining whether the beams formed using the first subset of feeds can transmit the signals to the first terrestrial regions with signal level above a predetermined threshold.

30. The apparatus of claim 29, wherein the signal level includes at least one of signal power or signal gain.

31. The apparatus of claim 30, wherein determining the subset of the first terrestrial regions for covering by grouping feeds comprises:

determining one or more of the first terrestrial regions that are lower in priority than remaining first terrestrial regions, such that signals can be transmitted to the one or more of the first terrestrial regions that are lower in priority with lower signal level compared to signals that are transmitted to remainder of the first terrestrial regions,

wherein the lower signal level is above the predetermined threshold.

32. The apparatus of claim 20, wherein the beam former processor is configured to perform operations further comprising:

receiving, at a second time, a second group of signals for transmission through the plurality of amplifiers, wherein the second group of signals is less than a total number of feeds in the array;

determining second terrestrial regions for transmitting the second group of signals;

identifying a third subset of feeds that are configured to form beams covering the second terrestrial regions;

determining whether all second terrestrial regions are covered by beams formed using the third subset of feeds;

based on determining that all second terrestrial regions are not covered by beams formed using the third subset of feeds, determining a subset of the second terrestrial regions for covering by grouping feeds;

identifying, from the third subset of feeds, a fourth subset of feeds that are configured to form beams covering the subset of the second terrestrial regions;

controlling the switching circuitry to route the second group of signals from the plurality of amplifiers to a second group of hybrid matrices coupled to the third subset of feeds through the switching circuitry;

controlling a subset of the second group of hybrid matrices that are coupled to the fourth subset of feeds to group, in each hybrid matrix using the second configuration of the matrix circuitry, feeds that are coupled to the hybrid matrix and forwarding a respective received signal to the grouped feeds; and

controlling a remainder of the second group of hybrid matrices that are coupled to remaining feeds in the third subset of feeds to forward, in each hybrid matrix using the first configuration of the matrix circuitry, a respective received signal to an individual feed coupled to the hybrid matrix that is one of the remaining feeds in the third subset of feeds,

wherein the fourth subset of feeds and the remaining feeds in the third subset of feeds are enabled to form beams that cover the second terrestrial regions based on receiving the second group of signals from respective hybrid matrices.

33. The apparatus of claim 32, wherein the second group of signals are distinct from the first group of signals, the second terrestrial regions are distinct from the first terrestrial regions, the third subset of feeds are distinct from the first subset of feeds and the fourth subset of feeds are distinct from the second subset of feeds, the second group of hybrid matrices are distinct from the first group of hybrid matrices, and the configuration of the switching circuitry to route the second group of signals is different from the configuration of the switching circuitry to route the first group of signals.

34. The apparatus of claim 20, wherein the apparatus includes a beamforming satellite.