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A radiometer system having four channels: 5 GHz, l7 GHz, 34 GHz, all vertical polarization, and a 34 GHz sky horn, will be described. The system which is designed for collecting glaciological and oceanographic data is intended for airborne use and imaging is achieved by means of a multifrequency conically scanning antenna. Implementation of the noise-injection technique ensures the high absolute accuracy...
When a non-linear power amplifier is operated with a multicarrier signal, intermodulation products are produced and the link is impaired. In order to quantify this impairment two questions have to be resolved; first whether the IM spectra produced by the modulated carriers have any residual subjective effect and second, what is the equivalent noise level to be added to the thermal noise in the link...
The 11 GHz band is getting popularity for communications via satellite. A new uncooled parametric amplifier has therefore been designed in this frequency range to cover the operational needs of commercial traffic (Intelsat V satellites) as well as those of specific communication experiments in the 11/ 14 GHz bands related to OTS (Orbital Test Satellite, ESA) ECS (European Communication Satellite,...