[특허]Estimating an antenna pointing error by determining polarization

Raytheon Company

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특허 상세정보

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Estimating an antenna pointing error by determining polarization

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H01Q-001/00 H01Q-003/00 G01S-007/40
미국특허분류(USC)	342/077; 342/073; 342/074; 342/165; 342/173; 342/174; 342/175; 342/188; 342/195; 342/360; 342/361; 343/703
출원번호	US-0970768 (2004-10-20)
발명자 / 주소	Pozgay, Jerome H.
출원인 / 주소	Raytheon Company
대리인 / 주소	Baker Botts L.L.P.
인용정보	피인용 횟수 : 8 인용 특허 : 16

초록

Estimating an antenna pointing error includes receiving a signal sent from a reference located within a region. A polarization ratio is evaluated over the region. A minimum polarization ratio variance for the polarization ratio is established. A location corresponding to the minimum polarization ratio variance is identified. An antenna pointing error is estimated from the identified location.

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1. A method for estimating an antenna pointing error, comprising:receiving a signal sent from a reference, the signal detected by a singly polarized antenna system, the reference located within a region;evaluating a polarization ratio over the region, the polarization ratio comprising a ratio of polarization values, a polarization value comprising a complex scalar component of a polarization vector;establishing a minimum polarization ratio variance for the polarization ratio, the minimum polarization ratio variance describing a minimum variance of the polarization ratio over the region;identifying a location corresponding to the minimum polarization ratio variance; andestimating an antenna pointing error from the identified location.2. The method of claim 1, wherein the antenna system further comprises a plurality of radiators, the plurality of radiators having either a right-hand circular polarization or a left-hand circular polarization.3. The method of claim 1, wherein:the polarization ratio comprises a channel amplitude estimate; andevaluating the polarization ratio over the region further comprises:adjusting the channel amplitude estimate; andevaluating the polarization ratio with the adjusted channel amplitude estimate.4. The method of claim 1, wherein establishing the minimum polarization ratio variance for the polarization ratio further comprises:generating a polarization ratio map over the region; andselecting a peak of the polarization ratio map corresponding to the minimum polarization ratio variance.5. The method of claim 1, further comprising:repeating the following to generate a plurality of identified locations:evaluating the polarization ratio over the region;establishing the minimum polarization ratio variance for the polarization ratio; andidentifying the location corresponding to the minimum polarization ratio variance;determining an optimal location from the plurality of identified locations; andestimating an antenna pointing error from the optimal location.6. The method of claim 1, further comprising:generating a plurality of identified locations;performing a mathematical operation on the plurality of identified locations to determine an optimal location; andestimating an antenna pointing error from the optimal location.7. A system for estimating an antenna pointing error, comprising:a singly polarized antenna system operable to detect a signal sent from a reference located within a region; andan antenna pointing error module coupled to the antenna system and operable to:evaluate a polarization ratio over the region, the polarization ratio comprising a ratio of polarization values, a polarization value comprising a complex scalar component of a polarization vector;establish a minimum polarization ratio variance for the polarization ratio, the minimum polarization ratio variance describing a minimum variance of the polarization ratio over the region;identify a location corresponding to the minimum polarization ratio variance; andestimate an antenna pointing error from the identified location.8. The system of claim 7, wherein the antenna system further comprises a plurality of radiators, the plurality of radiators having either a right-hand circular polarization or a left-hand circular polarization.9. The system of claim 7, wherein:the polarization ratio comprises a channel amplitude estimate; andthe antenna pointing error module is further operable to evaluate the polarization ratio over the region by:adjusting the channel amplitude estimate; andevaluating the polarization ratio with the adjusted channel amplitude estimate.10. The system of claim 7, wherein the antenna pointing error module is further operable to establish the minimum polarization ratio variance for the polarization ratio by:generating a polarization ratio map over the region; andselecting a peak of the polarization ratio map corresponding to the minimum polarization ratio variance.11. The system of claim 7, wherein the antenna pointing error module is further operable to:repeat the following to generate a plurality of identified locations:evaluate the polarization ratio over the region;establish the minimum polarization ratio variance for the polarization ratio; andidentify the location corresponding to the minimum polarization ratio variance;determine an optimal location from the plurality of identified locations; andestimate an antenna pointing error from the optimal location.12. The system of claim 7, wherein the antenna pointing error module is further operable to:generate a plurality of identified locations;perform a mathematical operation on the plurality of identified locations to determine an optimal location; andestimate an antenna pointing error from the optimal location.13. Logic for estimating an antenna pointing error, the logic embodied in a computer readable medium and operable to:receive a signal sent from a reference, the signal detected by a singly polarized antenna system, the reference located within a region;evaluate a polarization ratio over the region, the polarization ratio comprising a ratio of polarization values, a polarization value comprising a complex scalar component of a polarization vector;establish a minimum polarization ratio variance for the polarization ratio, the minimum polarization ratio variance describing a minimum variance of the polarization ratio over the region;identify a location corresponding to the minimum polarization ratio variance; andestimate an antenna pointing error from the identified location.14. The logic of claim 13, wherein the antenna system further comprises a plurality of radiators, the plurality of radiators having either a right-hand circular polarization or a left-hand circular polarization.15. The logic of claim 13, wherein:the polarization ratio comprises a channel amplitude estimate; andthe logic is further operable to evaluate the polarization ratio over the region by:adjusting the channel amplitude estimate; andevaluating the polarization ratio with the adjusted channel amplitude estimate.16. The logic of claim 13, further operable to establish the minimum polarization ratio variance for the polarization ratio by:generating a polarization ratio map over the region; andselecting a peak of the polarization ratio map corresponding to the minimum polarization ratio variance.17. The logic of claim 13, further operable to:repeat the following to generate a plurality of identified locations:evaluate the polarization ratio over the region;establish the minimum polarization ratio variance for the polarization ratio; andidentify the location corresponding to the minimum polarization ratio variance;determine an optimal location from the plurality of identified locations; andestimate an antenna pointing error from the optimal location.18. The logic of claim 13, further operable to:generate a plurality of identified locations;perform a mathematical operation on the plurality of identified locations to determine an optimal location; andestimate an antenna pointing error from the optimal location.19. A system for estimating an antenna pointing error, comprising:means for receiving a signal sent from a reference, the signal detected by a singly polarized antenna system, the reference located within a region;means for evaluating a polarization ratio over the region, the polarization ratio comprising a ratio of polarization values, a polarization value comprising a complex scalar component of a polarization vector;means for establishing a minimum polarization ratio variance for the polarization ratio, the minimum polarization ratio variance describing a minimum variance of the polarization ratio over the region;means for identifying a location corresponding to the minimum polarization ratio variance; andmeans for estimating an antenna pointing error from the identified location.20. A method for estimating an antenna pointing error, comprising:receiving a signal sent from a reference, the signal detected by a singly polarized antenna system, the reference located within a region, the antenna system further comprising a plurality of radiators, the plurality of radiators having either a right-hand circular polarization or a left-hand circular polarization;evaluating a polarization ratio over the region, the polarization ratio comprising a ratio of polarization values, a polarization value comprising a complex scalar component of a polarization vector, the polarization ratio comprising a channel amplitude estimate, the polarization ratio evaluated over the region by:adjusting the channel amplitude estimate; andevaluating the polarization ratio with the adjusted channel amplitude estimate;establishing a minimum polarization ratio variance for the polarization ratio, the minimum polarization ratio variance describing a minimum variance of the polarization ratio over the region, the minimum polarization ratio variance for the polarization ratio established by:generating a polarization ratio map over the region; andselecting a peak of the polarization ratio map corresponding to the minimum polarization ratio variance;identifying a location corresponding to the minimum polarization ratio variance;estimating an antenna pointing error from the identified location;repeating the following to generate a plurality of identified locations:evaluating the polarization ratio over the region;establishing the minimum polarization ratio variance for the polarization ratio; andidentifying the location corresponding to the minimum polarization ratio variance;performing a mathematical operation on the plurality of identified locations to determine an optimal location; andestimating an antenna pointing error from the optimal location.

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Estimating an antenna pointing error by determining polarization

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Estimating an antenna pointing error by determining polarization

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이 특허에 인용된 특허 (16)

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