Characteristics of the Global Radio Frequency Interference in the Protected Portion of L-Band

The National Aeronautics and Space Administration’s (NASA’s) Soil Moisture Active–Passive (SMAP) radiometer has been providing geolocated power moments measured within a 24 MHz band in the protected portion of L-band, i.e., 1400–1424 MHz, with 1.2 ms 1.5 time frequency resolutions, as its Level 1A data. This paper presents important spectral temporal properties radio interference (RFI) L-band using SMAP Maximum average bandwidth duration RFI signals, RFI-free spectrum availability, variations such between ascending descending satellite orbits have reported across world. individual sources found to be usually less than 4.5 4.8 ms; is larger 20 most regions exceptions over Middle East Central Eastern Asia. It also shown that, signals can vary much 10 ms, respectively, certain locations. Furthermore, identify frequencies susceptible contamination observed assigned channels according their frequencies. demonstrated contrary common perception, center contaminated edges. Finally, there no significant correlations noted among different amplitude, bandwidth, band.