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An imaging algorithm for synthetic aperture interferometric radiometers with built-in RFI mitigation
Camps Carmona, Adriano José; Hyuk, Park; González Gambau, Veronica
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
Radio Frequency Interference (RFI) is probably one of the most important limiting factors in the accuracy of the brightness temperatures measured by microwave radiometers. Due to the proximity of the 'protected' L-band (1400-1427 MHz) to numerous services (communication, localization, broadcast...), this band is seriously affected by RFI, preventing ESA's SMOS mission or NASA/CONAE Aquarius mission from retrieving soil moisture and ocean salinity over large areas of the world. In this work, a technique is presented as an attempt to mitigate the RFI at its origin, when the synthetic aperture image is being formed. The technique is based on the well-known beam- and null-steering techniques used in today's advanced communication systems, but generalized to the synthetic aperture case, by means of the so-called equivalent array factor, which allows to interpret the 'synthetic aperture array' as a 'real aperture array' with an antenna in the position of each baseline. © 2014 IEEE.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció
Àrees temàtiques de la UPC::Energies::Energia solar tèrmica
Remote sensing
Radiation -- Measurement
Equivalent array factor
Radio-frequency interference
Synthetic aperture radiometers
Radiació -- Mesurament
Attribution-NonCommercial-NoDerivs 3.0 Spain
Institute of Electrical and Electronics Engineers (IEEE)

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