A Joint Detection System for Radio Frequency Interference in Spaceborne Microwave Radiometers

Microwave radiometer is a highly sensitive receiver for detecting the emitted and scattered energy of objects, but the radio frequency interference (RFI) caused by the use of radio equipment seriously affects the measurement accuracy of the microwave radiometers. In the view of the increasingly serious RFI of microwave radiometers, the joint RFI detection algorithm system has been proposed for spaceborne microwave radiometers. The frequency domain is subdivided in the mode of digital channelized, then the time domain detection and the statistical domain detection are combined in each sub band to identify and suppress interference signals. The time-domain detection algorithm is optimized to determine the specific position and duty cycle of the interference signals, and then, the kurtosis algorithm is used to determine the interference signal so that it can eliminate the bottom noise fluctuations caused by external environmental factors. Finally, a high-resolution fast detection method is achieved and the system simulation performance is provided. The algorithm implementation complexity is low, it is easy to reuse and also suitable for the engineering implementation of RFI detection in satellite microwave radiometers.