Power collection and transmission system and method

• US 5,019,768 A
• Filed: 02/11/1988
• Issued: 05/28/1991
• Est. Priority Date: 05/08/1985
• Status: Expired due to Term

• Current Assignee: David R. Criswell, Robert D. Waldron
• Original Assignee: David R. Criswell, Robert D. Waldron
• Inventors: Criswell, David R., Waldron, Robert D.
• Primary Examiner(s): HICKEY, ROBERT
• Application Number:
  US07/157,081
• Time in Patent Office: 1,202 Days
• Field of Search: 322/21, 322/2 R, 290/1, 244/158.2, 244/159
• US Class Current: 322/2.00R
• CPC Class Codes: B64G 1/428 Power distribution and management
• CPC Class Codes: B64G 1/4282 for transmitting power to earth or other spacecraft
• CPC Class Codes: B64G 1/44 using radiation, e.g. deployable solar arrays
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• CPC Class Codes: H01Q 1/248 provided with an AC/DC converting device, e.g. rectennas
• CPC Class Codes: Y10S 343/02 Satellite-mounted antenna

Abstract

A system for transmitting microwaves to one or more receiver assemblies comprises an array of separate microwave transmitting assemblies for emitting a plurality of microwave beams, the array being arranged to apparently fill a radiating aperture of predetermined shape and size when viewed from the direction of a receiver assembly, and a phase controlling assembly associated with the microwave transmitting assemblies for controlling the relative phase of the emitted beams to form at least one composite shaped microwave beam directed to at least one receiver assembly. The receiver assembly is located in the near field of the microwave beam. The transmitting assemblies are each associated with separate power sources comprising solar power collecting assemblies. In one arrangement the transmitting system is on the moon and the or each receiver assembly is on Earth.

Claims

1. A lunar power station, comprising:

solar power collecting means positioned about the lunar surface for intercepting solar radiant power;

power receiving means located on earth;

means defining a power transmitting aperture of predetermined area comprising an array of physically separate, spaced apart microwave power sources for transmitting separate beams of microwave radiation and an array of separate, microwave reflecting surfaces interleaved with the array of microwave sources within the transmitting area, each reflecting surface associated with at least one of the microwave power sources and comprising means for redirecting microwave radiation emitted from the respective microwave source into a common beam direction directed towards said power receiving means and for expanding the effective area of the respective beam, said reflecting surfaces being postioned to lie within said power transmitting aperture when viewed from said power receiving means; and

phase control means associated with said power sources for controlling the relative phase of the separate transmitting beams to form at least one composite power beam of predetermined, at least partially convergent shape directed at said receiving means, said phase control means including means allowing for variations in the lunar elevation relative to said receiving means during cycles of the moon;

said power receiving means being located in the radiating near field region of said transmitted single power beam.

2. The lunar power station of claim 1, wherein said phase control means comprises means for controlling said separate beams to form a plurality of composite power beams directed at separate receiving means on Earth.

3. The lunar power station of claim 1, further comprising:

conversion means associated with said solar power collecting means for converting said solar radiant power into a power form suitable for transmission to said power transmittal means.

4. The lunar power station of claim 1, said solar power collecting means being derived predominantly from materials available said lunar surface.

5. The lunar power station of claim 4, said solar power collecting means comprising at least one area of many physically separate photoconverters arranged about the lunar surface.

6. The lunar power station of claim 5, said solar power collecting means comprising separate areas of photoconverters positioned at locations generally corresponding to the east and west limbs of the moon'"'"'s diameter.

7. The lunar power station of claim 4, said solar power collecting means comprising a plurality of plots, each plot comprising a series of generally parallel ridges of photoconverters, each of said ridges having a glasslike surface covering compacted lunar soil.

8. The lunar power station of claim 1, wherein said aperture is approximately circular and between approximately 100,000 and one million times the wavelength of the transmitted radiation in diameter.

9. The lunar power station of claim 1, wherein said power transmitting sources include a plurality of segmented microwave transmitters positioned about the lunar surface.

10. The lunar power station of claim 9, wherein said segmented microwave transmitters are coordinated so as to be convergent on a given target associated with power receiving means.

11. The lunar power station of claim 1, further comprising:

lunar reflector means maintained relative to said lunar surface, said lunar reflector means for directing said solar radiant power to said solar power collecting means on said lunar surface.

12. The lunar power station of claim 1, further comprising:

lunar orbital transmitter means maintained relative to said lunar surface for directing said power beam from said power transmitting means to said receiving means.

13. The lunar power station of claim 1, further comprising:

power beam redirection means located in space in the near field of said power beam and maintained relative to the earth for directing said power beam transmitted from said transmitting aperture to said receiving means.

14. The lunar power station of claim 13, said power beam redirector means comprising at least one microwave reflector in orbit about the Earth to reflect said power beam from said power transmitting means to said receiving means during at least part of the day.

15. The lunar based power system of claim 1, wherein each solar power collector means comprises at least one plot comprising a plurality of spaced generally parallel mounds of lunar soil supporting at least one photoconversion layer, said photoconversion layer positioned so as to directly receive radiant energy.

16. The lunar based power system of claim 15, wherein said solar power collecting means comprises a plurality of plots of spaced photoconversion ridges, each plot being associated with a respective one of said power transmitting assemblies.

17. The lunar based power system of claim 1, wherein said solar power collector means comprises at least one series of spaced chevronlike structures, said chevronlike structures being formed in said lunar surface and each having at least one photoconversion layer included therein.

18. The lunar based power system of claim 1 wherein said solar power collecting means comprises at least one array of substantially linear spaced solar conversion surfaces extending in a generally north to south direction.

19. The system of claim 18, wherein a plurality of arrays of spaced solar conversion surfaces are provided, each conversion surface including means for converting collected solar power into electrical power, said conversion surfaces in each array being remote from and electrically connected to a respective one of said transmitting assemblies associated with said array.

20. The system of claim 19, wherein each photoconversion surface comprises a solid state photoconversion layer, and a metallic layer for pick-up of electricity from said photoconversion layer.

21. The system of claim 4, wherein said solar power collecting means comprises at least one plot having a series of spaced grooves formed in said lunar surface, each groove being connected to a high temperature cavity formed below said groove and containing means for converting thermal energy into electrical energy, said groove including means for reflecting incident solar power into said cavity to heat said material.

22. The system of claim 1, wherein said solar power collecting means includes storing means for storing at least part of the collected solar energy as thermal energy.

23. The system of claim 22, wherein said power collecting means includes means for converting collected solar energy into electrical energy, and means for transmitting said electrical energy to said storing means, said storing means comprising means for converting electrical energy into thermal energy and means for re-converting said thermal energy into electrical energy for connection to said power transmittal means.

24. A method of collecting solar power on the moon and transmitting collected power to one or more receiver structures on earth, comprising:

collecting solar power incident on at least one solar collector structure located on the surface of the moon;

storing at least a portion of the collected solar power during periods of high illumination for subsequent conversion of at least part of the stored power into microwave power during the lunar night and conversion of the remainder of the stored power into electrical power for use on the moon;

converting at least a portion of the collected solar radiation into microwave power;

transmitting said converted microwave power from an array of separate, spaced apart microwave transmitters into a plurality of microwave beams;

expanding the effective area of the microwave beams and redirecting them into a common beam direction towards at least one microwave receiver structure on Earth by means of wavefront modifying means positioned in the path of the separate beams emitted from the microwave transmitters, the wavefront modifying means forming an effective microwave aperture of predetermined dimensions when viewed from the microwave receiver structure;

controlling the relative phase of the transmitted microwave beams to form at least one composite microwave beam having a radiating near field and far field region, the beam being directed towards at least one microwave receiver structure;

receiving the single microwave beam at at least one microwave receiver structure positioned on Earth in the radiating near field region of the microwave beam;

the step of collecting solar radiation comprising collecting solar radiation in a plurality of plots of solar collector surfaces and connecting the collector surfaces in each plot to a selected one of the microwave transmitting assemblies;

forming in each collector plot a series of parallel trenches aligned in a generally east-west directional; and

forming a photoemissive layer along the bottom of each trench and forming anodes for receiving photoelectrons emitted from said photoemissive layer on the side walls of each trench.

25. A method of collecting solar power on the moon and transmitting collected power to one or more receiver structures on earth, comprising:

collecting solar power incident on at least one solar collector structure located on the surface of the moon;

storing at least a portion of the collected solar power during periods of high illumination for subsequent conversion of at least part of the stored power into microwave power during the lunar night and conversion of the remainder of the stored power into electrical power for use on the moon;

converting at least a portion of the collected solar radiation into microwave power;

transmitting said converted microwave power from an array of separate, spaced apart microwave transmitters into a plurality of microwave beams;

expanding the effective area of the microwave beams and redirecting them into a common beam direction towards at least one microwave receiver structure on Earth by means of wavefront modifying means positioned in the path of the separate beams emitted from the microwave transmitters, the wavefront modifying means forming an effective microwave aperture of predetermined dimensions when viewed from the microwave receiver structure;

controlling the relative phase of the transmitted microwave beams to form at least one composite microwave beam having a radiating near field and far field region, the beam being directed towards at least one microwave receiver structure;

receiving the single microwave beam at at least one microwave receiver structure positioned on Earth in the radiating near field region of the microwave beam;

the step of collecting solar radiation comprising collecting solar radiation in a plurality of plots of solar collector surfaces and connecting the collector surfaces in each plot to a selected one of the microwave transmitting assemblies;

forming in each collector plot a series of parallel trenches aligned in a generally east-west directional; and

forming a series of patches of photoemissive layers along the length of the trench, applying a magnetic field across the trench to cause photoelectrons emitted by said layers to travel along the trench, forming an anode at the end of the trench for receiving photoelectrons and a cathode at the opposite end of the trench.