The Radio Frequency Interference Mitigation in Ionospheric Sounding

Operating in noisy radio frequency environments has been a very important issue in high-frequency sounding these years, especially the narrow-band interference. So it is urgent to find an effective method to eliminate the interference. The algorithm of radio interference mitigation introduced in this paper is used to remove the radio frequency interference (RFI). It could estimate the exact frequency, amplitude and phase of the interference signal via spectral analysis and subtract the interference signal from the received signal in time domain. This algorithm has been well proved by data from ionosonde and perfect result could be seen from the comparison between the RFI mitigation-processed data and the unprocessed data. It is obviously that not only has been the interference eliminated, but also the SNR has been improved.