[특허]Calibrating an antenna by determining polarization

Raytheon Company

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Calibrating an antenna by determining polarization

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-007/40
미국특허분류(USC)	342/174; 342/073; 342/074; 342/165; 342/173; 342/175; 342/188; 342/195; 342/360; 342/361; 343/703
출원번호	US-0970255 (2004-10-20)
발명자 / 주소	Pozgay,Jerome H.
출원인 / 주소	Raytheon Company
대리인 / 주소	Baker Botts L.L.P.
인용정보	피인용 횟수 : 12 인용 특허 : 15

초록
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Calibrating an antenna includes receiving a signal sent from a reference located within a region. The signal has a polarization within an expected polarization range. Polarization value sets are established in accordance with the expected polarization range. Polarization ratios are generated from the plurality of polarization value sets. A minimum polarization ratio variance for the plurality of polarization ratios is established. A polarization value set corresponding to the minimum polarization ratio variance is identified. A calibration correction is...

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What is claimed is: 1. A method for calibrating an antenna, comprising: receiving a signal sent from a reference, the signal detected by a singly polarized antenna system, the reference located within a region, the signal having a polarization within an expected polarization range; establishing a plurality of polarization value sets in accordance with the expected polarization range, a polarization value set comprising one or more polarization values, a polarization value comprising a complex scalar component of a polarization vector; generating a plurality of polarization ratios from the plurality of polarization value sets; establishing a minimum polarization ratio variance for the plurality of polarization ratios, the minimum polarization ratio variance describing a minimum variance of the polarization ratios over the region; identifying a polarization value set corresponding to the minimum polarization ratio variance; and determining a calibration correction in accordance with the identified polarization value set. 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 generating a plurality of polarization ratios from the plurality of polarization value sets further comprises: selecting a polarization value set of the plurality of polarization value sets; obtaining a channel error estimate for the selected polarization value set; and establishing a polarization ratio in accordance with the channel error estimate. 4. The method of claim 1, wherein establishing the minimum polarization ratio variance for the plurality of polarization ratios further comprises: generating a polarization ratio map over the region; and selecting a peak of the polarization ratio map corresponding to the minimum polarization ratio variance. 5. The method of claim 1, wherein establishing the minimum polarization ratio variance for the plurality of polarization ratios further comprises: generating a plurality of polarization ratio maps over the region, the plurality of polarization ratio maps comprising an x-form polarization ratio map and a y-form polarization ratio map; identifying a plurality of peaks of the plurality of polarization ratio maps; and selecting a peak from the plurality of polarization ratio maps, the selected peak corresponding to the minimum polarization ratio variance. 6. The method of claim 1, wherein determining the calibration correlation in accordance with the identified polarization value set further comprises: obtaining a channel coefficient from the identified polarization value set; and determining the calibration correlation using the channel coefficient. 7. A system for calibrating an antenna, comprising: a singly polarized antenna system operable to detect a signal sent from a reference, the reference located within a region, the signal having a polarization within an expected polarization range; and a calibration module coupled to the antenna system and operable to: establish a plurality of polarization value sets in accordance with the expected polarization range, a polarization value set comprising one or more polarization values, a polarization value comprising a complex scalar component of a polarization vector; generate a plurality of polarization ratios from the plurality of polarization value sets; establish a minimum polarization ratio variance for the plurality of polarization ratios, the minimum polarization ratio variance describing a minimum variance of the polarization ratios over the region; identify a polarization value set corresponding to the minimum polarization ratio variance; and determine a calibration correction in accordance with the identified polarization value set. 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 calibration module is further operable to generate a plurality of polarization ratios from the plurality of polarization value sets by: selecting a polarization value set of the plurality of polarization value sets; obtaining a channel error estimate for the selected polarization value set; and establishing a polarization ratio in accordance with the channel error estimate. 10. The system of claim 7, wherein the calibration module is further operable to establish the minimum polarization ratio variance for the plurality of polarization ratios by: generating a polarization ratio map over the region; and selecting a peak of the polarization ratio map corresponding to the minimum polarization ratio variance. 11. The system of claim 7, wherein the calibration module is further operable to establish the minimum polarization ratio variance for the plurality of polarization ratios by: generating a plurality of polarization ratio maps over the region, the plurality of polarization ratio maps comprising an x-form polarization ratio map and a y-form polarization ratio map; identifying a plurality of peaks of the plurality of polarization ratio maps; and selecting a peak from the plurality of polarization ratio maps, the selected peak corresponding to the minimum polarization ratio variance. 12. The system of claim 7, wherein the calibration module is further operable to determine the calibration correlation in accordance with the identified polarization value set by: obtaining a channel coefficient from the identified polarization value set; and determining the calibration correlation using the channel coefficient. 13. Logic for calibrating an antenna, 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, the signal having a polarization within an expected polarization range; establish a plurality of polarization value sets in accordance with the expected polarization range, a polarization value set comprising one or more polarization values, a polarization value comprising a complex scalar component of a polarization vector; generate a plurality of polarization ratios from the plurality of polarization value sets; establish a minimum polarization ratio variance for the plurality of polarization ratios, the minimum polarization ratio variance describing a minimum variance of the polarization ratios over the region; identify a polarization value set corresponding to the minimum polarization ratio variance; and determine a calibration correction in accordance with the identified polarization value set. 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, further operable to generate a plurality of polarization ratios from the plurality of polarization value sets by: selecting a polarization value set of the plurality of polarization value sets; obtaining a channel error estimate for the selected polarization value set; and establishing a polarization ratio in accordance with the channel error estimate. 16. The logic of claim 13, further operable to establish the minimum polarization ratio variance for the plurality of polarization ratios by: generating a polarization ratio map over the region; and selecting a peak of the polarization ratio map corresponding to the minimum polarization ratio variance. 17. The logic of claim 13, further operable to establish the minimum polarization ratio variance for the plurality of polarization ratios by: generating a plurality of polarization ratio maps over the region, the plurality of polarization ratio maps comprising an x-form polarization ratio map and a y-form polarization ratio map; identifying a plurality of peaks of the plurality of polarization ratio maps; and selecting a peak from the plurality of polarization ratio maps, the selected peak corresponding to the minimum polarization ratio variance. 18. The logic of claim 13, further operable to determine the calibration correlation in accordance with the identified polarization value set by: obtaining a channel coefficient from the identified polarization value set; and determining the calibration correlation using the channel coefficient. 19. A system for calibrating an antenna, 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, the signal having a polarization within an expected polarization range; means for establishing a plurality of polarization value sets in accordance with the expected polarization range, a polarization value set comprising one or more polarization values, a polarization value comprising a complex scalar component of a polarization vector; means for generating a plurality of polarization ratios from the plurality of polarization value sets; means for establishing a minimum polarization ratio variance for the plurality of polarization ratios, the minimum polarization ratio variance describing a minimum variance of the polarization ratios over the region; means for identifying a polarization value set corresponding to the minimum polarization ratio variance; and means for determining a calibration correction in accordance with the identified polarization value set. 20. A method for calibrating an antenna, comprising: receiving a signal sent from a reference, the signal detected by a singly polarized antenna system, the reference located within a region, the signal having a polarization within an expected polarization range, the antenna system comprising a plurality of radiators, the plurality of radiators having either a right-hand circular polarization or a left-hand circular polarization; establishing a plurality of polarization value sets in accordance with the expected polarization range, a polarization value set comprising one or more polarization values, a polarization value comprising a complex scalar component of a polarization vector; generating a plurality of polarization ratios from the plurality of polarization value sets by: selecting a polarization value set of the plurality of polarization value sets; obtaining a channel error estimate for the selected polarization value set; and establishing a polarization ratio in accordance with the channel error estimate; establishing a minimum polarization ratio variance for the plurality of polarization ratios, the minimum polarization ratio variance describing a minimum variance of the polarization ratios over the region, the minimum polarization ratio variance for the plurality of polarization ratios established by: generating a plurality of polarization ratio maps over the region, the plurality of polarization ratio maps comprising an x-form polarization ratio map and a y-form polarization ratio map; identifying a plurality of peaks of the plurality of polarization ratio maps; and selecting a peak from the plurality of polarization ratio maps, the selected peak corresponding to the minimum polarization ratio variance; and determining a calibration correction in accordance with the identified polarization value set by: obtaining a channel coefficient from the identified polarization value set; and determining the calibration correlation using the channel coefficient.

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Calibrating an antenna by determining polarization

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