دراسة وتحليل الخفوت التربوسفيري متعدد المسارات لخط اتصال ميكروي في سوريا
Abstract
يقدم هذا البحث دراسة وتحليل الخفوت التربوسفيري متعدد المسارات لخط اتصال ميكروي في سوريا, حيث يعتبر الخفوت التربوسفيري متعدد المسارات السبب الرئيسي في انخفاض مستوى عمل نظام النقل لخط الاتصال الميكروي (Line of sight), لذلك فإن الهدف الأساسي من دراسة الانتشار التربوسفيري في هذا البحث هو الحصول على التوقع التحليلي المبني على معطيات إحصائية لآلية الانتشار عبر طبقة التربوسفير, والتنبؤ بأداء خط الاتصال الميكروي خلال تلك المنطقة.
سجلت عدة بارامترات مثل درجة الحرارة والرطوبة والضغط في منطقة شبه مدنية (في محافظة حمص _ سوريا) من خلال معهد الأرصاد الجوية بمعدل من ثلاث إلى ثماني مرات يومياً, وتم اختيار المعطيات الخاصة بالسنوات الثلاث (2007,2006,2005).
يمكن بمعرفة الحالات الجوية السابقة تحديد عامل الانكسار لطبقة التربوسفير في تلك المنطقة, ومن ثم إنشاء نموذج رياضي برمجي لحساب البارامترات الخاصة بتعدد المسارات لعدة خطوط اتصال ميكروية مقترحة, ودراسة خصائص كل من هذه الخطوط للحصول على الخط الأفضل أداءً والأقل تأثراً بظاهرة الخفوت الناتجة عن تعدد المسارات التربوسفيرية.
This paper presented the study of refractive multipath fading on microwave link in Syria, where refractive multipath fading is recognized as the dominant mechanism of system degradation on MLOS (Microwave Line Of Sight) links. Therefore the objectives of the proposed propagation study in this paper are to obtain quantitative estimates describing the possible propagation mechanisms through a tropospheric region, and to predict the performance of proposed MLOS links in that region.
Various measurements on temperature, relative humidity, and pressure are recorded for a humid region (Homs), and supplied by meteorological department in Syria. The data is based on daily measurements ranging from 3 to 8 readings with a collection period of 3 years (2005, 06, 07).
Knowing the meteorological conditions, the profile of refractivity is first determined in that region. The mathematical model of the propagation channel is then generated to calculate the multipath parameters. Different link parameters and configurations are also proposed, and the performance of each is analyzed. Consequently, the optimum link parameters and configuration are recommended.
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