Topic
L band
About: L band is a research topic. Over the lifetime, 674 publications have been published within this topic receiving 4570 citations.
Papers published on a yearly basis
Papers
More filters
••
01 Jan 1969TL;DR: In this paper, an avalanche-diode oscillator that achieved a pulsed power output of 180 W at 1.3 GHz with 40% efficiency was discussed. Frequency is tunable from 1.0-1.6 GHz with power variations less than 1 dB.
Abstract: An avalanche-diode oscillator that has achieved pulsed power output of 180 W at 1.3 GHz with 40% efficiency will be discussed. Frequency is tunable from 1.0-1.6 GHz with power variations less than 1 dB.
14 citations
••
TL;DR: This paper reviews the antennas for mobile communication satellites at Saab Ericsson Space, including ARTEMIS, EMS, ICO and Thuraya, and develops L-band radiators for geostationary applications in a technology similar to the one for ICO.
Abstract: This paper reviews the antennas for mobile communication satellites at Saab Ericsson Space, including ARTEMIS, EMS, ICO and Thuraya. ARTEMIS is a geostationary technology demonstrator. It contains an L-band, 1.5/1.6 GHz, mobile communication payload with an array fed reflector antenna. The array is used both for receive and transmit. Similar 4-element arrays were delivered for EMS (European Mobile Service) on board the ITALSAT F2 satellite. The ICO satellite system consists of 12 satellites in MEO orbit (10400 km). Each satellite has one transmit array at 2.185 GHz, and one receive array at 2.0 GHz. Saab Ericsson Space has developed L-band radiators for geostationary applications in a technology similar to the one for ICO, and has delivered 256 radiators to Hughes Space and Communications Company for Thuraya.
14 citations
••
TL;DR: A comparison of the background radiation predicted by a model developed from modern radio astronomy measurements with measurements made with several modern L-band remote sensing radiometers validates the model and illustrates the magnitude of the correction necessary in remote sensing applications.
Abstract: The spectral window at L-band (1.413 GHz) is important for passive remote sensing of surface parameters such as soil moisture and sea surface salinity that are needed to understand the hydrological cycle and ocean circulation. Radiation from celestial sources (mostly galactic) is strong in this window, and an accurate accounting of this background radiation is often needed for calibration. This paper presents a comparison of the background radiation predicted by a model developed from modern radio astronomy measurements with measurements made with several modern L-band remote sensing radiometers. The comparison validates the model and illustrates the magnitude of the correction necessary in remote sensing applications.
14 citations
••
TL;DR: In this article, the characteristics of random ionospheric inhomogeneities are described including their dependency on the geophysical parameters and used in a propagation model to estimate the propagation errors and the fades of the transmitted signals.
Abstract: The characteristics of random ionospheric inhomogeneities are described including their dependency on the geophysical parameters. They are used in a propagation model to estimate the propagation errors and the fades of the transmitted signals. Margins to be included in a budget link are subsequently determined. Features of our propagation model are presented with typical results for VHF and L band links.
14 citations