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mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Effect of dust particle size distribution and intensity variation on microwave signal attenuation prediction
  name:
    name part: Ahmed, Elfatih AbdelRahman
    role:
      role term: creator
  name:
    name part: International Islamic University Malaysia
    name part: Department of Electrical and Computer Engineering
  genre: Theses, IIUM local
  origin info:
    place:
      place term: Kuala Lumpur
    publisher: Kulliyyah of Engineering, International Islamic University Malaysia
    date issued: 2011
  language:
    language term: eng
  physical description:
    extent: xv, 78 leaves : ill. charts; 30cm.
  abstract: Dust storms are meteorological phenomena occur for a percentage of time in arid and semi arid areas especially at African Sahara and Middle East. Measurements at existing microwave links have showed dust storms can potentially result in serious attenuation in signal level especially at Ku band and higher frequencies with direct impact on telecommunications system performance. However, only a limited amount of research has been carried out and the available data was very scarce. Few prediction models have been developed to estimate microwave signal attenuation during the dust storm. Theses prediction models did not incorporate the variation of the dust particle size distribution. Therefore, none of predicted results fitted with the measured results. In this project two dust storm attenuation prediction models have been investigated based on the obtained particle size statistical distributions such as exponential, lognormal, normal and discrete. The estimated attenuation after implementing the effective particle size (re =38.2 μm) at frequency 40 GHz and visibility values 0.625, 1.25, 1.42, 3.75 and 5.56 km were 0.17, 0.09, 0.07, 0.03 and 0.02 dB/km which were close to the measured attenuation 0.14, 0.1,0.07, 0.05 and 0.036 dB/km in Saudi Arabia. Measurements have showed that the dust storm intensity varies horizontally (terrestrial links) and vertically (earth satellite links). All dust storm attenuation prediction models have proposed the attenuation due to dust storm in dB/km and the total attenuation as multiplied by link length assuming that the dust storm is uniformly distributed throughout the microwave link. However, to predict the total attenuation due to dust storm that a microwave link might suffer, an adjustment factor is needed to account for the variation of dust storm intensity along the propagation path. Adjustment factors which reflect the variation of dust storm intensity have been derived based on the analysis of horizontal and vertical dust storm b…
  note: by Elfatih Abdelrahman Ahmed
  note: Abstract in English and Arabic.
  note: "A dissertation submitted in fulfilment of the requirement for the degree of Master of Science in Commmunication Engineering."--On t.p.
  note: Thesis (MSCE)--International Islamic University Malaysia, 2011.
  note: Includes bibliographical references (leaves 71-78).
  subject:
    topic: Dust storms
  subject:
    topic: Meteorology
  subject:
    topic: Microwaves
    topic: Attenuation
  subject:
    topic: Microwave communication systems
  classification: QC958
  identifier: http://studentrepo.iium.edu.my/handle/123456789/4713
  record info:
    record content source: UIAM
    record creation date: 120201
    language of cataloging:
      language term: eng