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Radio-frequency interference (RFI) is a major limiting factor in passive microwave remote sensing and radio astronomy. A digitally based radiometer system has been developed to improve RFI mitigation through the use of high temporal and spectral resolution. The system includes a pulse-blanking algorithm that is capable of removing pulsed time-domain sources(More)
Corruption of C-band microwave brightness observations by radio-frequency interference (RFI) has been reported in recent data from orbiting radiometers; methods for mitigating these effects are of great importance for the design of future spaceborne microwave radiometers. One approach that has been suggested involves the use of multiple subchannels at(More)
The performance of the Shapiro-Wilk (S-W) test of normality for the detection of pulsed sinusoidal radio frequency interference (RFI) in microwave radiometry is analyzed. The study is motivated by the fact that the S-W test has been shown in the statistical literature to be effective in detecting a wide variety of non-Gaussian signal types. The basic(More)
Two algorithms used in microwave radiometry for radio-frequency interference (RFI) detection and mitigation are the pulse detection algorithm and the kurtosis detection algorithm. The relative performance of the algorithms is compared both analytically and empirically. Their probabilities of false alarm under RFI-free conditions and of detection when RFI is(More)
An analysis of the performance of a cross-frequency detection algorithm for pulsed sinusoidal radio frequency interference (RFI) is performed. The performance obtained is compared with that of pulse and kurtosis detection methods that have been previously reported. The results of the study show that the cross-frequency algorithm provides good performance in(More)
The Shapiro-Wilk (S-W) test is a test of normality recommended in the statistical literature for its effectiveness in detecting a wide-variety of non-gaussian signals. Tests for normality can be used for the detection of Radio Frequency Interference (RFI). However, so far only the kurtosis test has been used for this purpose. The performance of the S-W test(More)
Passive microwave remote sensing at L-band is usually limited to the protected portion of the frequency spectrum (1400 to 1427 MHz). Operation outside this band is practically prohibited due to the presence of radio frequency interference (RFI), including pulsed-RFI from ground-based radars. To address this issue, a digital backend with real-time RFI(More)
Scan blindness phenomenon for finite phased arrays of printed dipoles on material coated, electrically large circular cylinders is investigated. Effects on the scan blindness mechanism of several array and supporting structure parameters, including curvature effects, are observed and discussed. A full-wave solution, based on a hybrid method of(More)
This paper describes C-band Radio Frequency Interference (RFI) measurements made from NASA’s WB-57 highaltitude aircraft using the PSR/CXI system of NOAA/ETL and the C-band Interference Suppressing Radiometer (CISR) digital backend of the Ohio State University (OSU) ElectroScience Laboratory. The observations discussed were performed during a test flight on(More)
A study of cross frequency blanking for the mitigation of radio frequency interference in microwave radiometry is described. The data utilized were acquired in a 2005 flight over Texas cities, and include observations from 5.5 to 7.7 GHz at 0.1 MHz spectral resolution. A simple algorithm is described for detecting and mitigating interference, and the(More)