Ricean Bias Correction in Linear Polarization Observation
I developed an enhanced correction method for Ricean bias which occurs in linear polarization measurement. Two known methods for Ricean bias correction are reviewed. In low signal-to-noise area, the method based on the mode of the equation gives better representation of the fractional polarization...
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| Format: | Article |
| Language: | English |
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The Korean Space Science Society
2011-12-01
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| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2011/v28n4/OJOOBS_2011_v28n4_267.pdf |
| Summary: | I developed an enhanced correction method for Ricean bias which occurs in linear polarization measurement. Two
known methods for Ricean bias correction are reviewed. In low signal-to-noise area, the method based on the mode of
the equation gives better representation of the fractional polarization. But a caution should be given that the accurate estimation
of noise level, i.e. σ of the polarized flux, is important. The maximum likelihood method is better choice for high
signal-to-noise area. I suggest a hybrid method which uses the mode of the equation at the low signal-to-noise area and
takes the maximum likelihood method at the high signal-to-noise area. A modified correction coefficient for the mode
solution is proposed. The impact on the depolarization measure analysis is discussed. |
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| ISSN: | 2093-5587 2093-1409 |