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- W2014911346 abstract "The satellite-to-helicopter radio channel is measured, characterized, analyzed, and modelled. We used a sweep time delay cross correlation sounder operating at 14.25 GHz and actual helicopters for the experiment. From the measurements, signal fading, delay and Doppler spread are estimated. Wideband radio channel results show that the signal delay spread is small enough, so 32 MHz satellite transponders could be used with no need of equalization. We also observed two important propagation impairments on the received signal envelope, both of them caused by the main rotor blades. The first one is the power attenuation produced when the LoS is obstructed by the blades. We demonstrate that this effect could be mitigated by using spatial or polarization diversity technique in the receiver end. The second one is the presence of multipath propagation leading to a power level oscillation dependent on the amplitude of the received multipath components. An UTD-based 3-D ray tracing model was used to conclude that the main multipath components are generated by diffraction on the rotor blade edges." @default.
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- W2014911346 date "2014-07-01" @default.
- W2014911346 modified "2023-09-27" @default.
- W2014911346 title "Measurement, Characterization, and Modeling of the Helicopter Satellite Communication Radio Channel" @default.
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- W2014911346 doi "https://doi.org/10.1109/tap.2014.2317483" @default.
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