Topic
L band
About: L band is a research topic. Over the lifetime, 674 publications have been published within this topic receiving 4570 citations.
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TL;DR: An L band superfluorescent fiber source with output power of 0.94W is presented, under 4.4W 976nm pump power and the optical conversion efficiency is about 21%.
Abstract: An L band superfluorescent fiber source (SFS) with output power of 0.94W is presented, under 4.4W 976nm pump power. The optical conversion efficiency is about 21%. The spectrum covers the broad wavelength range from 1560nm to 1615nm. The high power L band SFS is constructed by a low power L band amplified spontaneous emission (ASE) seed source and a high power erbium-ytterbium co-doped fiber (EYDF) amplifier in double pass forward pumping configuration.
24 citations
01 Jun 1987
TL;DR: In this article, a planar phased array (PFA) was proposed as one of the land vehicle antennas for the U.S. Mobile Satellite Experiment (MSAT-X) program, where the objective is to develop medium gain satellite tracking antennas that will alleviate the spacecraft power burden through higher gain, and enable multiple-satellite operation in the same frequency band through narrower beam.
Abstract: The planar phased array, due to its low profile and beam agility, has been proposed as one of the land vehicle antennas for the U.S. Mobile Satellite Experiment (MSAT-X) program. The objective is to develop medium gain satellite tracking antennas (as versus omni low gain antennas) that will alleviate the spacecraft power burden through higher gain, and enable multiple-satellite operation in the same frequency band through narrower beam. In addition, this narrower beam can spatially filter out a significant portion of the undesired multipath component. The major challenges are to seek technologies that will minimize the antenna insertion loss, achieve accurate beam pointing with sufficient inter-satellite isolation, and minimize the antenna production cost.
23 citations
01 Jul 2006
TL;DR: An airborne, fully polarimetric L-band radiometer system intended for sea salinity campaigns is described, which provides unique possibilities for RFI detection, and for mitigation of pulsed signals before final integration.
Abstract: An airborne, fully polarimetric L-band radiometer system intended for sea salinity campaigns is described. The radiometer is of the digital kind: the L-band signal is directly fed into a fast A to D converter using sub-harmonic sampling. All Stokes parameters are calculated digitally in a fast FPGA. Special attention is paid to detection and mitigation of interference from external active sources: the digital radiometer principle with fast sampling provides unique possibilities for RFI detection, and for mitigation of pulsed signals before final integration. Keywords; microwave, radiometer, sea salinity, RFI mitigation
23 citations
01 Jan 2019
23 citations
TL;DR: Results of a flight test program involving a KC-135 jet airplane, the synchronous ATS-5 L -band satellite, and a ground station are presented, finding CW tone-ranging performance was determined in both the thermal noise and multipath environments.
Abstract: Results of a flight test program involving a KC-135 jet airplane, the synchronous ATS-5 L -band satellite, and a ground station are presented. Tests included over-ocean multipath measurements and one-way tone ranging within the 1545-1655 MHz frequency band. Amplitude characteristics, polarization, power spectral density, and selective fading properties were measured for sea-reflected and composite signal channels. CW tone-ranging performance was determined in both the thermal noise and multipath environments. Comparison of experimental results with theoretical expectation is given.
22 citations