Results 281 to 290 of about 11,654,989 (317)
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1976 International Electron Devices Meeting, 1976
An Electron Bombarded Semiconductor (EBS) amplifier has been developed which has a combination of characteristics which make it an attractive alternative to metal-ceramic triodes and transistors for generation of high peak powers at lower microwave frequencies.
B.W. Bell, R.I. Knight
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An Electron Bombarded Semiconductor (EBS) amplifier has been developed which has a combination of characteristics which make it an attractive alternative to metal-ceramic triodes and transistors for generation of high peak powers at lower microwave frequencies.
B.W. Bell, R.I. Knight
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2016 Radio Frequency Interference (RFI), 2016
In recent years, three instruments have been launched into orbit with the aim of producing global maps of sea surface salinity and soil moisture using the 1400–1427 MHz band: SMOS, Aquarius and SMAP. Although this frequency band is allocated to passive measurements only, RFI (Radio-Frequency Interference) is present in the data of all three missions ...
Yan Soldo +2 more
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In recent years, three instruments have been launched into orbit with the aim of producing global maps of sea surface salinity and soil moisture using the 1400–1427 MHz band: SMOS, Aquarius and SMAP. Although this frequency band is allocated to passive measurements only, RFI (Radio-Frequency Interference) is present in the data of all three missions ...
Yan Soldo +2 more
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2015 Conference on Microwave Techniques (COMITE), 2015
The paper deals with a modeling and construction of a reflector antenna. Two electronically selected orthogonal antenna planes are realized due to orthogonally oriented ports at primary radiator. Ground clutter suppression is carried out thanks to narrow antenna beam width at elevation plane.
Vadim Zavodny, Petr Kopecky
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The paper deals with a modeling and construction of a reflector antenna. Two electronically selected orthogonal antenna planes are realized due to orthogonally oriented ports at primary radiator. Ground clutter suppression is carried out thanks to narrow antenna beam width at elevation plane.
Vadim Zavodny, Petr Kopecky
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AN L-BAND TUNNEL DIODE OSCILLATOR (INCLUDING L-BAND TRANSISTOR OSCILLATOR-MULTIPLIERS).
1964Abstract : Gallium-Arsenide tunnel diodes having 600 ma peak current and resistive cutoff frequencies of 6 to 10 Gc were developed. The diodes were fabricated in a low inductance package permitting operation at L-band at power outputs up to 30 mw. Low impedance oscillator circuits were designed which gave power outputs of 20 to 30 mw over the required ...
E. T. Casterline, R. Gold, D. E. Nelson
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L-Band RFI Detected by SMOS and Aquarius
IEEE Transactions on Geoscience and Remote Sensing, 2017Ocean salinity and soil moisture are key parameters for understanding the global water cycle, weather, and climate. These parameters are being measured with spaceborne radiometers operating in the L-band window at 1400–1427 MHz. Although man-made activity in this band is prohibited, radio frequency interference (RFI) is still a problem over significant
Yan Soldo +3 more
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The CoSMOS L-band experiment in Southeast Australia
2007 IEEE International Geoscience and Remote Sensing Symposium, 2007The CoSMOS (Campaign for validating the Operation of the Soil Moisture and Ocean Salinity mission) campaign was conducted during November of 2005 in the Goulburn River Catchment, in SE Australia. The main objective of CoSMOS was to obtain a series of L-band measurements from the air in order to validate the L-band emission model that will be used by ...
Kauzar Saleh-Contell +17 more
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ULID: an Unconnected L-band Interferometer Demonstrator
IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019Continuation of brightness temperature measurements at L- band is a major asset for soil moisture and ocean salinity studies in the long term. The SMOS mission, launched in 2009, has been followed by Aquarius and SMAP, but follow-on missions are still in the preliminary phases.
François Cabot +3 more
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Measurement of sea level by L-band SAR
IGARSS 2003. 2003 IEEE International Geoscience and Remote Sensing Symposium. Proceedings (IEEE Cat. No.03CH37477), 2004We present a method to measure tide height from L- band synthetic aperture radar (SAR) data. We have successfully constructed 17 coherent interferograms from JERS-1 SAR data over oyster sea-farming structures. The coherent phases preserved in the interferograms showed a close relation with sea level.
Sang-Wan Kim, Joong-Sun Won
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The airborne EMIRAD L-band radiometer system
2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS, 2013This paper describes the EMIRAD L-band radiometer, developed in support of the ESA/SMOS mission. The instrument is a fully polarimetric, dual antenna system, built with special focus on antenna accuracy, receiver stability, and detection and mitigation of radio frequency interference (RFI).
Sten S. Søbjærg +3 more
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Measurement of the dielectric constant of seawater at L-band
IGARSS 2003. 2003 IEEE International Geoscience and Remote Sensing Symposium. Proceedings (IEEE Cat. No.03CH37477), 2004Accurate relationships between salinity and dielectric constant (which determines emissivity) are needed for sensor systems such as SMOS and Aquarius that will monitor salinity from space in the future. This paper describes a resonant cavity technique for the measurement of the dielectric constant of seawater as a function of its salinity.
Roger H. Lang +2 more
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