A Precise Localization of RFI Sources in Synthetic Aperture Interferometric Radiometers

Distributed from low frequency to terahertz (THz) band, radio frequency interference (RFI) are contaminating the retrievals of geophysical parameters from the measurements of microwave radiometers. GeoSTAR-III, working at 180 GHz, may also face such problem. Accurate localization is very important for effectively switching off illegal RFI sources. In this work, a precise RFI localization approach is presented to reduce computation load. The proposed RFI localization method utilizes the minimum difference in the vicinity of the RFI source. This method can reduce computation complexity without reducing accuracy.