Generation and use of similar multiple beams

• US 10,541,732 B2
• Filed: 03/02/2016
• Issued: 01/21/2020
• Est. Priority Date: 03/03/2015
• Status: Active Grant

• Current Assignee: Stratospheric Platforms, Ltd.
• Original Assignee: Stratospheric Platforms, Ltd.
• Inventors: Alexander, Paul, Davidson, Peter, Faulkner, Andrew
• Primary Examiner(s): Payne, David C
• Assistant Examiner(s): Hassan, Sarah
• Application Number:
  US15/554,670
• Publication Number:
  US 20180083672A1
• Time in Patent Office: 1,420 Days
• Field of Search: 375259, 342352
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/18504 Aircraft used as relay or high altitude atmospheric platform

Abstract

A process for cooperative aerial inter-antenna beamforming for communication between (a) multiple moving platforms, each platform having an aerial antenna mounted thereon, such that the aerial antennas have variable positions and orientations over time, and (b) at least one user antenna mounted on user equipment having a lower altitude than the aerial antennas; the process involving a first beamforming operation which beamforming operation involves; transmitting data relating to the positions and orientations of the aerial antennas to a processing system, the processing system calculating and transmitting beamforming instructions to the aerial antennas, the aerial antennas thereby transmitting or receiving respective component signals for each user antenna, the component signals for each user antenna having essentially the same information content but differing in their phase and usually amplitude, so as to form a cooperative beam from the cooperative sum of the signals between the aerial antennas and the user antenna; carrying out a plurality of further beamforming operations, wherein the cooperative beam has essentially the same information content as that generated in the first beamforming operation, where by the further cooperative beams are directed to form a cluster of beams surrounding the first cooperative beam.

Claims

1. A process for cooperative aerial inter-antenna beamforming for communication between (a) multiple moving platforms, each platform having an aerial antenna mounted thereon, such that one or more aerial antennas have variable positions and orientations over time, and (b) at least one user antenna mounted on user equipment having a lower altitude than the aerial antennas;

the process involving a first beamforming operation which beamforming operation involves;

determining the positions of the aerial antennas to within 1/10th of a wavelength of signals between the aerial antennas and the user antenna;

transmitting data relating to the positions and orientations of the aerial antennas to a processing system, the processing system calculating and transmitting beamforming instructions to the aerial antennas, the aerial antennas thereby transmitting or receiving respective component signals for each user antenna, the component signals for each user antenna having essentially the same information content but differing in their phase and usually amplitude, so as to form a cooperative beam from a cooperative sum of the signals between the aerial antennas and the user antenna; and

carrying out a plurality of further beamforming operations, wherein the cooperative beam has essentially the same information content as that generated in the first beamforming operation, whereby the further cooperative beams are directed to form a cluster of beams surrounding the first cooperative beam.

3. The process according to claim 1, wherein additional beamforming operations are carried out and added to the cluster, in response to the processing system receiving updated location information of the user antenna.

4. The process according to claim 1, wherein existing cooperative beams are removed from the cluster, in response to the processing system receiving updated location information of the user antenna.

5. The process according to claim 1, wherein the direction of at least one beam in the cluster is altered in response to the processing system receiving updated location information of the user antenna.

6. The process according to claim 1, wherein a location of the user antenna is determined by monitoring a power level in each of the cooperative beams in the cluster over time.

7. The process according to claim 1, wherein positional and orientation data is transmitted by the aerial antennas to at least one ground based station.

8. The process according to claim 1, wherein the processing system comprises a ground based processing centre.

9. The process according to claim 7, wherein ground level processing dominates an overall signal processing capability, consuming over 70 percent of the signal processing electronics power requirements.

10. The process according to claim 1, wherein at least one aerial antenna is at an elevated location of at least 10,000m.

11. The process according to claim 1, wherein at least one of the aerial antennas is a phased array antenna.

12. The process according to claim 1, wherein at least one of the aerial antennas is connected to the ground.

13. The process according to claim 1, wherein the platforms comprise unmanned solar powered aircraft, airships or hybrid air vehicles.

14. The process according to claim 1, wherein the platforms comprise unmanned hydrogen powered aircraft.

15. The process according to claim 1, wherein the platforms comprise tethered aerostats.

16. The process according to claim 1, wherein the platforms comprise free-flying aerostats.

17. The process according to claim 1, wherein the platforms comprise hydrocarbon-fueled aircraft.

18. The process according to claim 1, wherein the platforms comprise satellites.

19. The process according to claim 1, wherein at least some of the platforms use different antennas for transmission or reception.

20. The process according to claim 1, wherein data rates to and/or from the user antenna exceed 100 Mbps.

22. Non-transitory computer-readable media encoded with a computer program comprising computer implementable instructions which when implemented on a computer cause the computer to perform the process according to claim 1.

23. The process according to claim 1, wherein the determining comprises utilizing differential global navigation satellite system data to obtain the positions of the aerial antennas to moderate accuracy, reversing the beamforming process, and correlating signals from the aerial antennas to obtain the positions of the aerial antennas to within 1/10th of the wavelength of the signals between the aerial antennas and the user antenna.

24. The process according to claim 1, wherein the determining with respect to an individual aerial antenna comprises:

determining a phase difference y_i, being a fraction of a wavelength between the values 0 and 1, between signals of known wavelength λ

_i transmitted from or to i ground based transmitters, wherein i is at least three, the ground based transmitters having known positions to within λ

_i/10, thereby establishing a distance from the ground based transmitters to the aerial antennas to be λ

_i(n_i+y_i), wherein n_i is an unknown integer;

determining the position of the individual aerial antenna approximately by differential GPS within a small number of wavelengths λ

_i thereby establishing that n_i can be one of a limited number of possible integer values for each signal, wherein the number of ground based transmitters and their positions being sufficient to allow elimination of the possible values of n_i that are inconsistent with the limited number of possible values for n_i from the other ground based transmitters, until only one integer value for each n_i is established; and

establishing the location of the individual aerial antenna by triangulation of its known distance λ

_i(n_i+y_i), from at least three ground based transmitters.

25. The process according to claim 1, wherein the determining the positions of the aerial antennas comprises determining the positions of the aerial antennas to less than 20 cm.

2. An apparatus for providing a communication network, for communication between (a) multiple moving platforms, each platform having an aerial antenna mounted thereon, such that one or more aerial antennas have variable positions and orientations over time, and (b) at least one user antenna mounted on user equipment having a lower altitude than the aerial antennas, the network being adapted to generate a first beamforming operation which beamforming operation involves:

determining the positions of the aerial antennas to within 1/10th of a wavelength of signals between the aerial antennas and the user antenna;

transmitting data relating to the positions and orientations of the aerial antennas to a processing system, the processing system being further adapted to generate and transmit beamforming instructions to the aerial antennas, the aerial antennas being adapted to generate or receive respective component signals for each user antenna, the component signals for each user antenna having essentially the same information content but differing in their phase and amplitude, so as to form a cooperative beam between the cooperative sum of the signals between the aerial antennas and the user antenna; and

the network being adapted to carry out a plurality of further beamforming operations, wherein the further cooperative beams have essentially the same information content as that generated in the first beamforming operation, whereby the further cooperative beams are directed to form a cluster of beams surrounding the first cooperative beam.

21. A method of receiving and/or transmitting data, applications and/or content to an antenna on user equipment, the method utilising the apparatus according to claim 2.