Digital correlation microwave polarimetry: analysis and demonstration
The design, analysis, and demonstration of a digital-correlation microwave polarimeter for use in Earth remote sensing is presented. The authors begin with an analysis of a three-level digital correlator and develop the correlator transfer function and radiometric sensitivity. A fifth-order polynomi...
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| Veröffentlicht in: | IEEE transactions on geoscience and remote sensing 2001-11, Vol.39 (11), p.2392-2410 |
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| container_title | IEEE transactions on geoscience and remote sensing |
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| creator | Piepmeier, J.R. Gasiewski, A.J. |
| description | The design, analysis, and demonstration of a digital-correlation microwave polarimeter for use in Earth remote sensing is presented. The authors begin with an analysis of a three-level digital correlator and develop the correlator transfer function and radiometric sensitivity. A fifth-order polynomial regression is derived for inverting the digital correlation coefficient into the analog statistic. In addition, the effects of quantizer threshold asymmetry and hysteresis are discussed. A two-look unpolarized calibration scheme is developed for identifying correlation offsets. The developed theory and calibration method are verified using a 10.7 GHz and a 37.0 GHz polarimeter. The polarimeters are based upon 1-GS/s three-level digital correlators and measure the first three Stokes parameters. Through experiment, the radiometric sensitivity is shown to approach the theoretical as derived earlier in the paper and the two-look unpolarized calibration method is successfully compared with results using a polarimetric scheme. Finally, sample data from an aircraft experiment demonstrates that the polarimeter is highly useful for ocean wind-vector measurement. |
| doi_str_mv | 10.1109/36.964976 |
| format | Article |
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The authors begin with an analysis of a three-level digital correlator and develop the correlator transfer function and radiometric sensitivity. A fifth-order polynomial regression is derived for inverting the digital correlation coefficient into the analog statistic. In addition, the effects of quantizer threshold asymmetry and hysteresis are discussed. A two-look unpolarized calibration scheme is developed for identifying correlation offsets. The developed theory and calibration method are verified using a 10.7 GHz and a 37.0 GHz polarimeter. The polarimeters are based upon 1-GS/s three-level digital correlators and measure the first three Stokes parameters. Through experiment, the radiometric sensitivity is shown to approach the theoretical as derived earlier in the paper and the two-look unpolarized calibration method is successfully compared with results using a polarimetric scheme. 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| identifier | ISSN: 0196-2892 |
| ispartof | IEEE transactions on geoscience and remote sensing, 2001-11, Vol.39 (11), p.2392-2410 |
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| language | eng |
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| source | IEEE Xplore |
| subjects | Applied geophysics Calibration Correlation analysis Correlators Digital Earth Earth sciences Earth, ocean, space Exact sciences and technology Internal geophysics Marine geology Microwave radiometry Microwaves Polarimeters Polarimetry Polynomials Regression analysis Remote sensing Sea measurements Statistics Stokes parameters Transfer functions |
| title | Digital correlation microwave polarimetry: analysis and demonstration |
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