Details

Autor(en) / Beteiligte

• Li Li
• Njoku, E.G.
• Im, E.
• Chang, P.S.
• Germain, K.St

Titel

A preliminary survey of radio-frequency interference over the U.S. in Aqua AMSR-E data

Ist Teil von

• IEEE transactions on geoscience and remote sensing, 2004-02, Vol.42 (2), p.380-390

Ort / Verlag

New York, NY: IEEE

Erscheinungsjahr

2004

Quelle

IEEE Electronic Library Online

Beschreibungen/Notizen

• A spectral difference method is used to quantify the magnitude and extent of radio-frequency interference (RFI) observed over the United States in the Aqua AMSR-E radiometer channels. A survey using data from the AMSR-E instrument launched in May 2002 shows the interference to be widespread in the C-band (6.9 GHz) channels. The RFI is located mostly, but not always, near large highly populated urban areas. The locations of interference are persistent in time, but the magnitudes show temporal and directional variability. Strong and moderate RFI can be identified relatively easily using an RFI index derived from the spectral difference between the 6.9- and 10.7-GHz channels. Weak RFI is difficult to distinguish, however, from natural geophysical variability. These findings have implications for future microwave sensing at C-band, particularly over land areas. An innovative concept for radiometer system design is also discussed as a possible mitigation approach.