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

Aksoy, Mustafa; Rajabi, Hamid

doi:10.1109/igarss.2019.8898779

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…It is also possible to obtain further information on the RFI environment through a classification of the sources observed in SMAP footprints into categories, for example, "narrowband pulsed", "wideband pulsed", etc. as in [22]- [23]. Therefore, continuing efforts to develop automated approaches for this process will be reported in future studies.…”

Section: Detector Statistics and Rfi Sources Propertiesmentioning

confidence: 99%

Properties of the RFI Environment at 1400–1427 MHz as Observed by the Soil Moisture Active/Passive Mission Microwave Radiometer

Bringer

Johnson

Soldo

et al. 2021

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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The Soil Moisture Active/Passive (SMAP) satellite microwave radiometer has been providing global measurements of L-band thermal emission from Earth since April 2015. Although the radiometer operates in the protected 1400-1427 MHz portion of the radio spectrum, its measurements are still corrupted by either Radio Frequency Interference (RFI) from out-of-band emissions via legal sources or by sources operating in-band illegally. The SMAP radiometer includes a digital backend that enables implementation of multiple ground-based RFI detection and filtering algorithms. This data is used to collect statistics and trends of Earth's RFI environment. This paper examines properties of the global RFI environment as observed by SMAP, including information on RFI source properties (obtained from analysis of SMAP multiple detector outputs) and the evolution of the RFI environment in time. Residual RFI contributions after the application of SMAP RFI processing are also examined as preliminary information for the development of future methods to address their effect.

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Section: Detector Statistics and Rfi Sources Propertiesmentioning

confidence: 99%

Properties of the RFI Environment at 1400–1427 MHz as Observed by the Soil Moisture Active/Passive Mission Microwave Radiometer

Bringer

Johnson

Soldo

et al. 2021

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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show abstract

“…Similar to [17,18], the RFI detection and characterization process of this study starts with preprocessing of the Level 1A data, and then, four different RFI detection algorithms, i.e., cross frequency, time domain pulse blanking, kurtosis, and skewness, are applied to retrieve the properties of RFI observed by SMAP. Note that, unlike SMAP, polarimetry is not used to detect RFI in this study.…”

Section: Approach To Reveal L-band Rfi Characteristicsmentioning

confidence: 99%

“…However, spectrum allocations and usage can be different in different regions and times; thus, further analyses of the RFI properties based on their geographical location and observation times are required. This paper, expanding on a short conference paper presented at the 2019 IEEE International Geoscience and Remote Sensing Symposium [18], addresses this gap in the literature and is structured as follows:…”

Section: Introductionmentioning

confidence: 99%

“…An RFI detection and characterization procedure, similar to the one discussed in [17,18] with some improvements, applied to SMAP Level 1A data measured between May 1 and 7, 2019 to extract RFI properties in the protected portion of L-band is presented in Section 3. The multi-domain procedure contains time and frequency domain pulse blanking, kurtosis, and skewness algorithms implemented simultaneously.…”

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confidence: 99%

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

et al. 2021

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

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Retrieval of RFI Characteristics Using L-Band Satellite Data

Soldo¹,

Oliva²,

Vine

et al. 2020

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium

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

Cited by 4 publications

References 3 publications

Properties of the RFI Environment at 1400–1427 MHz as Observed by the Soil Moisture Active/Passive Mission Microwave Radiometer

Properties of the RFI Environment at 1400–1427 MHz as Observed by the Soil Moisture Active/Passive Mission Microwave Radiometer

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

Retrieval of RFI Characteristics Using L-Band Satellite Data

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