IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0614950
(2006-12-21)
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등록번호 |
US-7330151
(2008-02-12)
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발명자
/ 주소 |
- Monk,Anthony D.
- King,Janet
- Miller,Jeffrey D.
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출원인 / 주소 |
|
대리인 / 주소 |
Ingrassia Fisher & Lorenz, P.C.
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인용정보 |
피인용 횟수 :
16 인용 특허 :
3 |
초록
▼
A system and methods for aligning an elliptical beam of an antenna to a line-of-sight from the antenna to a remote receiver are disclosed. The methods offset the antenna from an initial pointing direction in an antenna pointing coordinate system. Coordinates of the pointing offsets are determined i
A system and methods for aligning an elliptical beam of an antenna to a line-of-sight from the antenna to a remote receiver are disclosed. The methods offset the antenna from an initial pointing direction in an antenna pointing coordinate system. Coordinates of the pointing offsets are determined in the E-plane and H-plane of an antenna beam coordinate system. The method then converts the coordinates of the pointing offsets from the antenna beam coordinate system into coordinates of offset points each located in the antenna pointing coordinate system according to the polarization angle of the E-plane and the H-plane, and performs a tracking algorithm using relative signal strength measurement data at the initial pointing directions and at the coordinates of the offset points. The true location of the center/peak of the elliptical beam is calculated in azimuth/elevation planes of the antenna pointing coordinate system.
대표청구항
▼
What is claimed is: 1. A method for aligning an elliptical beam of an antenna, having an antenna beam coordinate system, the method comprising: pointing the antenna to an initial pointing direction, wherein the initial pointing direction has coordinates in an antenna pointing coordinate system that
What is claimed is: 1. A method for aligning an elliptical beam of an antenna, having an antenna beam coordinate system, the method comprising: pointing the antenna to an initial pointing direction, wherein the initial pointing direction has coordinates in an antenna pointing coordinate system that includes an azimuth plane coordinate and an elevation plane coordinate; determining coordinates of E-plane pointing offsets relative to the initial pointing direction, wherein the coordinates of the E-plane pointing offsets are located in an E-plane of the antenna beam coordinate system; converting the coordinates of the E-plane pointing offsets from the antenna beam coordinate system into a first E-plane offset point and a second E-plane offset point, wherein each E-plane offset point is located in the antenna pointing coordinate system; determining coordinates of H-plane pointing offsets relative to the initial pointing direction, wherein the coordinates of the H-plane pointing offsets are located in an H-plane of the antenna beam coordinate system; converting the coordinates of the H-plane pointing offsets from the antenna beam coordinate system into a first H-plane offset point and a second H-plane offset point, wherein each H-plane offset point is located in the antenna pointing coordinate system; and calculating a true location of a peak of the elliptical beam in coordinates of the antenna pointing coordinate system. 2. A method according to claim 1, wherein the first E-plane offset point is located in the antenna pointing coordinate system at (Az0+ΔE sin ψ, El0��ΔE cos ψ), where Az0 is the azimuth plane coordinate of the initial pointing direction, El0 is the elevation plane coordinate of the initial pointing direction, ΔE is the E-plane pointing offset in the antenna beam coordinate system, and ψ is the polarization angle. 3. A method according to claim 1, wherein the second E-plane offset point is located in the antenna pointing coordinate system at (Az0-ΔE sin ψ, El0-ΔE cos ψ), where Az0 is the azimuth plane coordinate of the initial pointing direction, El0 is the elevation plane coordinate of the initial pointing direction, ΔE is the E-plane pointing offset in the antenna beam coordinate system, and ψ is the polarization angle. 4. A method according to claim 1, wherein the first H-plane offset point is located in the antenna pointing coordinate system at (Az0+ΔH cos ψ, El0-ΔH sin ψ), where Az0 is the azimuth plane coordinate of the initial pointing direction, El0 is the elevation plane coordinate of the initial pointing direction, ΔH is the H-plane pointing offset in the antenna beam coordinate system, and ψ is the polarization angle. 5. A method according to claim 1, wherein the second H-plane offset point is located in the antenna pointing coordinate system at (Az0-ΔH cos ψ, El0+ΔH sin ψ), where Az0 is the azimuth plane coordinate of the initial pointing direction, El0 is the elevation plane coordinate of the initial pointing direction, ΔH is the H-plane pointing offset in the antenna beam coordinate system, and ψ is the polarization angle. 6. A method according to claim 1, further comprising: tracking a location of the peak of the elliptical beam based on relative signal strengths measured at the E-plane offset points and measured at the initial pointing direction; tracking the location of the peak of the elliptical beam based on relative signal strengths measured at the H-plane offset points; aligning the antenna to a direction corresponding to the peak of the elliptical beam in the antenna pointing coordinate system. 7. A method according to claim 1, wherein the true location of the peak of the elliptical beam is based on the relationships: description="In-line Formulae" end="lead"Az=Az0+εE sin ψ+εH cos ψ; anddescription="In-line Formulae" end="tail" El=El0+εE cos ψ-εH sin ψ; where Az is true direction of the peak of the elliptical beam in the azimuth plane coordinate, El is true direction of the peak of the elliptical beam in the elevation plane coordinate, Az0 is the azimuth plane coordinate of the initial pointing direction, El0 is the elevation plane coordinate of the initial pointing direction, εE is an offset of the peak of the elliptical beam from the initial pointing direction in the E-plane; εH is an offset of the peak of the elliptical beam from the initial pointing direction in the H-plane, and ψ is the polarization angle. 8. A method for pointing an elliptical beam of an antenna having an antenna beam coordinate system, the method comprising: pointing the antenna to an initial pointing direction, wherein the initial pointing direction has coordinates in an antenna pointing coordinate system; determining coordinates of pointing offsets in the antenna beam coordinate system; converting the coordinates of the pointing offsets from the antenna beam coordinate system into coordinates of offset points each located in the antenna pointing coordinate system; and calculating a true location of a peak of the elliptical beam in coordinates of the antenna pointing coordinate system. 9. A method according to claim 8, wherein the converting step further comprises: obtaining a polarization angle of the antenna beam coordinate system; and obtaining the coordinates of the offset points in the antenna pointing coordinate system using the polarization angle. 10. A method according to claim 9, wherein the obtaining step locates the offset points in the antenna pointing coordinate system at: description="In-line Formulae" end="lead"(Az0+ΔE sin ψ, El0+ΔE cos ψ);description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"(Az0-ΔE sin, El0-ΔE cos ψ);description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"(Az0+ΔH cos ψ, El0-ΔH sin ψ); anddescription="In-line Formulae" end="tail" (Az0-ΔH cos ψ, El0+ΔH sin ψ), where Az0 is an azimuth plane coordinate of the initial pointing direction, El0 is an elevation plane coordinate of the initial pointing direction, ΔH is an H-plane offset point in the antenna beam coordinate system, ΔE is an E-plane offset point in the antenna beam coordinate system, and ψ is the polarization angle. 11. A method according to claim 8, wherein the antenna pointing coordinate system comprises an azimuth plane coordinate and an elevation plane coordinate. 12. A method according to claim 11, wherein the true location of the peak of the elliptical beam in the antenna pointing coordinate system is located at: description="In-line Formulae" end="lead"Az=Az0+εE sin ψ+εH cos ψ; anddescription="In-line Formulae" end="tail" El=El0+εE cos ψ-εH sin ψ; where Az is true direction of the peak of the elliptical beam in the azimuth plane coordinate, El is true direction of the peak of the elliptical beam in the elevation plane coordinate, Az0 is an azimuth plane coordinate of the initial pointing direction, El0 is an elevation plane coordinate of the initial pointing direction, εE is an offset of the peak of the elliptical beam from the initial pointing direction in an E-plane; εH is an offset of the peak of the elliptical beam from the initial pointing direction in an H-plane, and ψ is the polarization angle. 13. A method according to claim 8, wherein the antenna beam coordinate system comprises an antenna E-plane, and an antenna H-plane. 14. A method according to claim 8, further comprising tracking the peak of the elliptical beam based on relative signal strengths measured at the offset points and measured at the initial pointing direction. 15. A system for aligning an elliptical beam of an antenna to a line-of-sight of a remote transceiver, wherein the antenna has an initial pointing direction, the system comprising: a receiver coupled to the remote transceiver and configured to measure properties of received electromagnetic signals, wherein the received electromagnetic signals are delivered by the antenna; and an antenna controller coupled to the receiver and configured to: determine coordinates of E-plane pointing offsets relative to the initial pointing direction, wherein the coordinates of the E-plane pointing offsets are located in an E-plane of the antenna beam coordinate system; convert the coordinates of the E-plane pointing offsets from the antenna beam coordinate system into a first E-plane offset point and a second E-plane offset point, wherein each E-plane offset point is located in the antenna pointing coordinate system; determine coordinates of H-plane pointing offsets relative to the initial pointing direction, wherein the coordinates of the H-plane pointing offsets are located in an H-plane of the antenna beam coordinate system; convert the coordinates of the H-plane pointing offsets from the antenna beam coordinate system into a first H-plane offset point and a second H-plane offset point, wherein each H-plane offset point is located in the antenna pointing coordinate system; and calculate a true location of a peak of the elliptical beam in coordinates of the antenna pointing coordinate system. 16. A system according to claim 15, further comprising a memory module coupled to the receiver and configured to store measured properties of the received electromagnetic signals. 17. A system according to claim 15, wherein the measured properties of received electromagnetic signals comprise: a measured relative received signal strength at the initial pointing direction; measured relative received signal strengths at the H-plane offset points; and measured relative signal strengths at the E-plane offset points. 18. A system according to claim 15, wherein the antenna pointing coordinate system comprises an azimuth plane coordinate and an elevation plane coordinate. 19. A system according to claim 18, wherein the true location of the peak of elliptical beam is located in the azimuth plane and the elevation plane coordinates. 20. A system according to claim 15, wherein the antenna controller is further configured to: track a location of a peak of the elliptical beam based on relative signal strengths measured at the E-plane offset points and measured at the initial pointing direction; track the location of the peak of the elliptical beam based on relative signal strengths measured at the H-plane offset points; and align the antenna to a direction corresponding to the location of the peak of the elliptical beam in the antenna pointing coordinate system.
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