تحلیل قابلیت اطمینان در مولد سوئیچینگ سیگنال لورن حلقه باز با استفاده از شاخص کلی اثربخشی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه جامع امام حسین (ع)

2 گروه الکترونیک دانشگاه صنعتی مالک اشتر

چکیده

برای طراحی فرستنده سوئیچینگ لورن مبتنی بر مدولاسیون عرض پالس (PWM) چند سطحی، سناریو‌های مختلفی برای چیدمان تقویت‌کننده­ها و تعداد سطوح مدولاسیون وجود دارد که باید در ابعاد مختلف مورد بررسی قرار گیرند. قابلیت پیاده­سازی، تحقُق استانداردهای پالس لورن و تحلیل قابلیت‌اطمینان سه مشخصه مهم در این زمینه هستند. در این مقاله با استفاده از نتایج شبیه‌سازی، قابلیت‌اطمینان انواع مولدهای لورن حلقه باز مبتنی بر سوئیچینگ عرض پالس با تعداد سطوح مختلف به کمک شاخص کلی اثربخشی (OMOE) بررسی شده است. برای این کار با انتخاب مشخصه‌های اساسی و تعیین وزن هرکدام از آن‌ها، مقدار هدف و کمینه قابل‌ قبول هر مشخصه‌ بر مبنای استانداردهای لورن تعیین و OMOE بر مبنای سناریوهای مورد نظر به‌دست ­آمده است. نتایج شبیه‌سازی­ها نشان می­دهد آرایش مدولاسیون عرض پالس نُه­سطحی با OMOE به میزان 573/0، 506/0 و 451/0 به‌ترتیب برای حالت­های بدون بلوک آسیب‌دیده، یک و دو بلوک آسیب‌دیده با میانگین 510/0 بهینه‌ترین ساختار از نظر قابلیت اطمینان است. در مدولاسیون دامنه و مدولاسیون عرض پالس با هفت و یازده ­سطح، میانگین این شاخص برای سه حالت مذکور به‌ترتیب برابر 455/0 ، 463/0 و 485/0 می‌باشد که مقدار کمتری نسبت به‌ساختار بهینه دارند.

کلیدواژه‌ها


عنوان مقاله [English]

Reliability Analysis of Open-Loop Switching Loran Signal Generator Using Omoe Indicator

نویسندگان [English]

  • A. Khorrami 1
  • A. Afifi 2
  • M. H. Ghezel Ayagh 1
  • A. R. Amin 1
1 ihu
2 Electrical and computer Eng. Malek Ashtar univ.
چکیده [English]

There are various parameters for conceptual design of a LORAN transmitter based on multi-level pulse width modulation (PWM), such as structural arrangement of amplifiers and number of modulation levels. The parameters should be considered in different aspects, such as implementation possibility, realization of LORAN signal standards and reliability analysis. In this paper, the overall measure of efectiveness (OMOE) indicator is used to simulate the reliability results of various open-loop LORAN transmitters based on multi-level PWM. So, by selecting the basic parameters and determining the weight of each parameter, the target value and the minimum acceptable value of each parameter, based on LORAN standards, are determined and OMOE is derived for several scenarios. The results of simulations show that the nine-level PWM arrangement is the most reliable structure. The OMOE of this structure is equal to 0.573, 0.506 and 0.451 (with average of 0.510) for the three states of all-safe amplifier blocks, and one- and two- damaged blocks, respectively. The average of this indicator for the same states are equal to 0.455, 0.463 and 0.485 for pulse amplitude modulation, and seven- and eleven-levels PWM structures, respectively, which have smaller values relative to the optimum structure. 
 

کلیدواژه‌ها [English]

  • LORAN Transmitter
  • Multi-Level PWM
  • Reliability
  • Switching Amplifier
  • OMOE Indicator
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