Radio-Frequency Interference Detection and Mitigation Algorithms for Synthetic Aperture Radiometers

Algorithms

Adriano Camps³  Jerome Gourrion²  Jose Miguel Tarongi³  Mercedes Vall·Llossera³  Antonio Gutierrez¹  Jose Barbosa¹ 

[1] DEIMOS ENGENHARIA, Av. D. Joao II, Lote 1.17, Torre Zen, 10°, 1998-023 Lisboa, Portugal; E-Mails:;SMOS Barcelona Expert Center, Institut de Ciencies del Mar, CMIMA–CSIC, Department of Physical Oceanography, Passeig Maritim, 37-49, E-08003 Barcelona, Spain; E-Mail:;Remote Sensing Lab, Department of Signal Theory and Communications, Universitat Politècnica de Catalunya, E-08034 Barcelona, Spain; E-Mails:

关键词: synthetic aperture radiometer;    radio-frequency interference;    L-band;    detection;    mitigation;    algorithm;   

DOI  :  10.3390/a4030155

来源: mdpi

【 摘 要 】

The European Space Agency (ESA) successfully launched the Soil Moisture and Ocean Salinity (SMOS) mission in November 2, 2009. SMOS uses a new type of instrument, a synthetic aperture radiometer named MIRAS that provides full-polarimetric multi-angular L-band brightness temperatures, from which regular and global maps of Sea Surface Salinity (SSS) and Soil Moisture (SM) are generated. Although SMOS operates in a restricted band (1400–1427 MHz), radio-frequency interference (RFI) appears in SMOS imagery in many areas of the world, and it is an important issue to be addressed for quality SSS and SM retrievals. The impact on SMOS imagery of a sinusoidal RFI source is reviewed, and the problem is illustrated with actual RFI encountered by SMOS. Two RFI detection and mitigation algorithms are developed (dual-polarization and full-polarimetric modes), the performance of the second one has been quantitatively evaluated in terms of probability of detection and false alarm (using a synthetic test scene), and results presented using real dual-polarization and full-polarimetric SMOS imagery. Finally, a statistical analysis of more than 13,000 L1b snap-shots is presented and discussed.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.