Comparison and analysis of the interference identification methods for microwave measurements over snow land

doi:10.6046/gtzyyg.2018.03.06

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Abstract

The influence of radio-frequency interference (RFI) on spaceborne microwave radiometer measurements is increasingly prominent, which largely reduces the accuracy of geophysical parameter inversion from microwave observations. RFI over Antarctica land was detected and analyzed using spectral difference, normalized principal component analysis (NPCA) and double principal component analysis (DPCA) method based on AMSR-E (the advanced microwave scanning radiometer - earth observing system) Leval 2A measurements during July 1-7, 2011. It is found that, over snow or ice-covered land, the RFI signals are difficult to be detected by spectral difference method, while NPCA method works but for costal areas. However, the DPCA method works well over the Atlantic land. Furthermore. It is also found that stronger RFI signals are detected widely over the Antarctica land at low frequency channels of AMSR-E, and most of the strong RFI signals are collocated with research stations. In general, the RFI is stronger at horizontal polarization channels than those at vertical polarization channels, but in some parts, RFI signals at 10.65 GHz for vertical polarization are stronger than those for horizontal polarization.

Keywords advanced microwave scanning radiometer-earth observation system (AMSR-E) radio-frequency interference (RFI) snow land

TP422.2TP722.6

Issue Date: 10 September 2018

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	Ying WU
	Sulin JIANG
	Zhenhui WANG

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Ying WU,Sulin JIANG,Zhenhui WANG. Comparison and analysis of the interference identification methods for microwave measurements over snow land[J]. Remote Sensing for Land & Resources, 2018, 30(3): 40-47.

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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2018.03.06 OR https://www.gtzyyg.com/EN/Y2018/V30/I3/40

Fig.1 Brightness temperatures with vertical polarizations over Atlantic during July 1—7, 2011

Fig.2 RFI with vertical polarization identified by spectral difference method

Fig.3 RFI of 6.925 GHz at horizontal polarization identified by NPCA

Fig.4 Brightness temperatures of 6.925 GHz, 10.65 GHz and 18.7 GHz at horizontal polarization reconstructed by A₁ and A₂

Fig.5 RFI distributions of 6.925 GHz at horizontal polarization identified by DPCA

Fig.6 RFI distributions of 6.925 GHz and 10.65 GHz identified by DPCA

Tab.1 Maximum and accumulated values of RFI at 6.925 GHz and 10.65 GHz

Tab.2 Percentages of dots with larger RFI values for horizontal polarization than those for vertical polarization

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[1]	Ying WU, Sulin JIANG, Zhenhui WANG. Effect of radio-frequency interference on the retrieval of land surface temperature from microwave radiation imager[J]. Remote Sensing for Land & Resources, 2018, 30(4): 90-96.
[2]	WU Ying, QIAN Bo, WANG Zhenhui. Effect of radio-frequency interference on the land surface parameters retrieval from passive microwave remote sensing data[J]. REMOTE SENSING FOR LAND & RESOURCES, 2017, 29(3): 176-181.

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