Abstract
The design and optimization of propagation impairment techniques for space telecommunication systems operating at frequencies above 20 GHz require a precise knowledge of the propagation channel both in space and time. For that purpose, space-time channel models have to be developed. In this paper the description of a model for the simulation of long-term rain attenuation time series correlated both in space and time is described. It relies on the definition of a stochastic rain field simulator constrained by the rain amount outputs of the ERA-40 reanalysis meteorological database. With this methodology, realistic propagation conditions can be generated at the scale of satellite coverage (i.e., over Europe or USA) for many years. To increase the temporal resolution, a stochastic interpolation algorithm is used to generate spatially correlated time series sampled at 1 Hz, providing that way valuable inputs for the study of the performances of propagation impairment techniques required for adaptive SatCom systems operating at Ka band and above.
Highlights
With the congestion of conventional frequency bands such as C (4–6 GHz) or Ku (11–14 GHz) band and the need to convey higher data rates for multimedia services, new SatCom systems are progressively pushed towards the use of higher-frequency bands such as Ka (20–30 GHz) or Q/V band (40–50 GHz) where larger bandwidth is available
Network simulations for SatCom systems operating at Ka and Q/V bands have to take into account the influence of the propagation channel, in terms of dynamics and in terms of the spatial variations [2]
The aim of this paper is to extend the range of validity of the stochastic rainfall field simulator described in [19] and adapted for rain attenuation in [5] from the midscale (∼300 × 300 km2) to the continental scale (Europe, USA) and from some hours to many years
Summary
With the congestion of conventional frequency bands such as C (4–6 GHz) or Ku (11–14 GHz) band and the need to convey higher data rates for multimedia services, new SatCom systems are progressively pushed towards the use of higher-frequency bands such as Ka (20–30 GHz) or Q/V band (40–50 GHz) where larger bandwidth is available At those frequencies, strong tropospheric impairments occur on Earth-space links with a significant impact on the system quality of service. The model proposed by [5] is realistic for short durations (some hours) and small areas (less than ∼300 × 300 km2) due to the stationarity assumption necessary to construct the random field in the Fourier plane This approach is unable to reproduce the alternation of clear sky and rainy periods, preventing that way the long-term simulation of propagation conditions. Some statistical properties of the simulations are lastly compared to statistics derived from weather radar datasets, ITU-R (International Telecommunication Union section Radiocommunications) Recommendations and to statistics obtained from beacon measurements
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