طراحی و شبیه‌سازی مولد سیگنال لورن در فرستنده موقعیت‌یاب محلی با به‌کارگیری تقویت‌کننده کلاس I

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مجتمع دانشگاهی برق و کامپیوتر، دانشگاه صنعتی مالک اشتر،

2 دانشیار، دانشگاه علم وصنعت ایران

چکیده

فرستنده لورن در سامانه موقعیت‌یابی محلی (LPS) یکی از اصلی­ترین بخش­هاست که نقش آن تولید و ارسال پالس‌های توان بالا با شکل موج خاص و دقت بالا می‌باشد. در این مقاله، روش جدیدی برای طراحی و ساخت فرستنده LPS بر مبنای تقویت‌کننده‌های سوئیچینگ کلاس I ارائه ‌شده است. هر بلوک فرستنده از واحدهای تقویت­کننده ترانزیستوری ماسفت که از طریق  مدولاسیون عرض پالس تحریک می‌شوند تشکیل شده است. عرض پالس در سیکل­های مختلف به کمک الگوریتمی بر مبنای کمترین مجموع مربعات خطا تعیین می‌شود. نتایج شبیه­سازی‌ها نشان­دهنده پیاده‌سازی دقیق سیگنال لورن به‌خصوص در لبه­های پسرو است. به‌طوری‌که حداکثر خطای عبور از صفر در نیم­سیکل چهارم تا دوازدهم  ns18، پهنای باند پالس تولیدی  kHz9/4 و MMSE آن که ارتباط مستقیم با ECD سیگنال لورن دارد؛ برابر با 009/0 است که همگی شرایط موردنیاز پالس لورن در فرستنده LPS را دارند. با استفاده از این روش که ذاتاً دارای راندمان بالایی است امکان ساخت سامانه­­های تاکتیکی موقعیت‌یابی با دقت و انعطاف­پذیری بالا و حجم کوچک فراهم می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Design and Simulation of a LORAN Signal Generator for LPS Transmitter Using Class I Amplifier

نویسندگان [English]

  • T. Aghazadeh 1
  • A. Afifi 1
  • A. Abrishamifar 2
1 دانشگاه مالک اشتر
2 IUST
چکیده [English]

Long-Range-Navigation (LORAN) transmitter is an essential part of a local positioning system (LPS) that provides high power and high precision pulses with a specific waveform. In this paper, a new method for design and implementation of the LPS transmitter, based on class I amplifiers, has been proposed. Each block of the transmitter includes MOSFET amplifier modules driven by pulse width modulation (PWM). The pulse width at each cycle has been calculated by an algorithm based on the least square method (LSM). Simulation results show that the obtained maximum zero crossing error in the 4th to 12th half-cycles is 18 ns, the generated pulse width is 4.9 kHz and the MMSE of the pulse, which is directly proportional to the ECD, is equal to 0.009, demonstrating  that with the proposed method it is possible to produce an accurate LORAN pulse with all the required parameters. High efficiency of class I amplifiers, makes this method a good candidate for light-weighted, highly accurate and flexible tactical LPS transmitters. 
 

کلیدواژه‌ها [English]

  • Local Positioning System
  • LPS
  • PWM
  • LORAN Signal
  • Navigation
  • Class I Amplifier
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