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Sensors 2011, 11(3), 3037-3050; doi:10.3390/s110303037
Article

Analysis of RFI Identification and Mitigation in CAROLS Radiometer Data Using a Hardware Spectrum Analyser

1, 1, 2,* , 1 and 1
1 LATMOS, Route de Troux, 78280 Guyancourt, France 2 CESBIO (UPS/CNRS/IRD/CNES), 18 Avenue Edouard Belin, bpi 2801, 31401 Toulouse Cedex 9, France
* Author to whom correspondence should be addressed.
Received: 30 January 2011 / Revised: 26 February 2011 / Accepted: 28 February 2011 / Published: 7 March 2011
(This article belongs to the Special Issue 10 Years Sensors - A Decade of Publishing)
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Abstract

A method to identify and mitigate radio frequency interference (RFI) in microwave radiometry based on the use of a spectrum analyzer has been developed. This method has been tested with CAROLS L-band airborne radiometer data that are strongly corrupted by RFI. RFI is a major limiting factor in passive microwave remote sensing interpretation. Although the 1.400–1.427 GHz bandwidth is protected, RFI sources close to these frequencies are still capable of corrupting radiometric measurements. In order to reduce the detrimental effects of RFI on brightness temperature measurements, a new spectrum analyzer has been added to the CAROLS radiometer system. A post processing algorithm is proposed, based on selective filters within the useful bandwidth divided into sub-bands. Two discriminant analyses based on the computation of kurtosis and Euclidian distances have been compared evaluated and validated in order to accurately separate the RF interference from natural signals.
Keywords: RFI; CAROLS; L-band; radiometry RFI; CAROLS; L-band; radiometry
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fanise, P.; Pardé, M.; Zribi, M.; Dechambre, M.; Caudoux, C. Analysis of RFI Identification and Mitigation in CAROLS Radiometer Data Using a Hardware Spectrum Analyser. Sensors 2011, 11, 3037-3050.

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