Une expérience de propagation Terre–Satellite en bande EHF a été réalisée dans le cadre du programme Syracuse 3 qui est la nouvelle génération de satellites militaires français de télécommunication. L'originalité de cette expérience réside dans les fréquences utilisées (20 GHz pour la liaison descendante et 44 GHz pour la liaison montante) et dans le faible angle d'élévation (17°). La première partie de l'article présente une analyse statistique des données concernant notamment les probabilités de dépassement, les coefficients de transposition en fréquence et les durées d'affaiblissement. Ces résultats sont comparés aux modèles standards de l'UIT. La seconde partie de l'article est dédiée à la prédiction à court-terme de l'affaiblissement qui est une étape généralement nécessaire pour implémenter des techniques adaptatives de lutte contre l'affaiblissement (FMT). L'affaiblissement sur la liaison descendante est tout d'abord prédit à l'aide d'un modèle ARIMA-GARCH non-linéaire. La prédiction est ensuite séparée en plusieurs composantes physiques (gaz, nuages et pluie) qui sont transposées à la fréquence de la liaison montante par des coefficients de transposition spécifiques. Les performances du modèle sont évaluées avec des données Syracuse 3 collectées pendant une période d'un an.
An Earth-to-satellite propagation experiment in the EHF band has been carried out within the framework of the Syracuse 3 program, which is a new generation French military SATCOM system. The originality of this experiment resides in the link's frequencies (20 GHz downlink and 44 GHz uplink) and its low elevation angle (17°). The first part of the article presents a statistical analysis of attenuation data providing the long-term statistics, frequency scaling ratios and fade durations. These results are compared to standard ITU models. The second part of the article is dedicated to the short-term forecasting of rain fade, useful for the implementation of Fade Mitigation Techniques (FMT). Firstly, the downlink attenuation is predicted based on a non-linear ARIMA-GARCH model. The prediction result is then separated into several physical components (gases, clouds and rain) that are scaled to the uplink frequency using specific frequency scaling factors. The performance of the model is assessed based on Syracuse 3 20/44-GHz data collected during a period of 1 year.
@article{CRPHYS_2010__11_1_18_0, author = {L. de Montera and L. Barth\`es and C. Mallet and P. Gol\'e and T. Marsault}, title = {Assessment of rain fade mitigation techniques in the {EHF} band on a {Syracuse} 3 {20/44-GHz} low elevation link}, journal = {Comptes Rendus. Physique}, pages = {18--29}, publisher = {Elsevier}, volume = {11}, number = {1}, year = {2010}, doi = {10.1016/j.crhy.2009.12.002}, language = {en}, }
TY - JOUR AU - L. de Montera AU - L. Barthès AU - C. Mallet AU - P. Golé AU - T. Marsault TI - Assessment of rain fade mitigation techniques in the EHF band on a Syracuse 3 20/44-GHz low elevation link JO - Comptes Rendus. Physique PY - 2010 SP - 18 EP - 29 VL - 11 IS - 1 PB - Elsevier DO - 10.1016/j.crhy.2009.12.002 LA - en ID - CRPHYS_2010__11_1_18_0 ER -
%0 Journal Article %A L. de Montera %A L. Barthès %A C. Mallet %A P. Golé %A T. Marsault %T Assessment of rain fade mitigation techniques in the EHF band on a Syracuse 3 20/44-GHz low elevation link %J Comptes Rendus. Physique %D 2010 %P 18-29 %V 11 %N 1 %I Elsevier %R 10.1016/j.crhy.2009.12.002 %G en %F CRPHYS_2010__11_1_18_0
L. de Montera; L. Barthès; C. Mallet; P. Golé; T. Marsault. Assessment of rain fade mitigation techniques in the EHF band on a Syracuse 3 20/44-GHz low elevation link. Comptes Rendus. Physique, Volume 11 (2010) no. 1, pp. 18-29. doi : 10.1016/j.crhy.2009.12.002. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2009.12.002/
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