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استفاده از مایکروداپلر سیگنال بازگشتی رادار در استخراج مشخصات بالگرد | ||
رادار | ||
مقاله 4، دوره 8، شماره 2 - شماره پیاپی 24، دی 1399، صفحه 31-45 اصل مقاله (911.93 K) | ||
نوع مقاله: مقاله پژوهشی | ||
نویسندگان | ||
فاطمه همدانی گلشن* 1؛ احسان یزدیان2 | ||
1دانشجوی دکتری،دانشکده برق و کامپیوتر، دانشگاه صنعتی اصفهان، اصفهان، ایران | ||
2استادیار، دانشکده برق، دانشگاه صنعتی اصفهان، اصفهان، ایران | ||
تاریخ دریافت: 28 شهریور 1399، تاریخ بازنگری: 15 آذر 1399، تاریخ پذیرش: 30 آذر 1399 | ||
چکیده | ||
پردازش مایکروداپلر برای استخراج ویژگیهای هدف در سالیان اخیر مورد توجه پژوهشگران متعدد قرار گرفته است. علاوه بر سرعت شعاعی اهداف نسبت به رادار، که باعث شیفت فرکانسی داپلر در فرکانس سیگنال بازگشتی به رادار میشود، حرکات دیگری نیز در بعضی از اهداف وجود دارد که مدولاسیون فرکانسی سوار بر فرکانس داپلر اصلی را ایجاد میکند. لرزشهای بدنه و موتور هواپیما و چرخش پرههای بالگرد نمونههایی از این حرکتاندکه باعث تولید جابجایی فرکانسی متناوب در زمان میشوند که به آن مایکروداپلر می گوییم. بر مبنای اطلاعات مایکروداپلر دریافتی از سیگنال بازگشتی رادار، اطلاعات زیادی از مشخصات هدف قابل استخراج بوده و میتوان پارامترهای مختلف هدف را تخمین زد. در این مقاله بهطور خاص به سیگنال مایکروداپلر بالگرد پرداختهشدهاست. تخمین پارامترهای بالگرد در زمینه تعداد پرهها، طول و سرعت زاویهای دوران آنها که درنهایت می تواند منجر به شناسایی کامل مدل بالگرد شود از اهداف این تحقیق است. بدین منظور روشهای ارائهشده برای تخمین پارامترهای بالگرد معرفی، دسته بندی و مرور میشوند. | ||
کلیدواژهها | ||
مایکروداپلر؛ بالگرد؛ تخمین پارامتر؛ رادار | ||
عنوان مقاله [English] | ||
Employing microdoppler of radar signal to extract the characteristics of helicopter rotor | ||
نویسندگان [English] | ||
Fatemeh HamedaniGolshan1؛ Ehsan Yazdian2 | ||
1PhD Student, Faculty of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan, Iran | ||
2Assistant Professor, Faculty of Electrical Engineering, Isfahan University of Technology, Isfahan, Iran | ||
چکیده [English] | ||
Microdoppler is a new subject in radar signal processing with a research history of about twenty years. Radial velocity of targets relative to radar position, causes doppler frequency shift of return signal to radar. In addition to radial velocity of target fuselage, many targets consist of components which have small scale motions which results in frequency modulation around the main doppler frequency shift. Vibrations of the motor components and fuselage of airplanes and blade rotation of helicopters are some examples of these types of small scale motions which produce periodic doppler shifts known as microdoppler. Extraction of microdoppler shift and its properties is very important in target classifications and estimating many parameters of the target. In this study we focus on microdoppler properties of return signal of radar from helicopter. Estimation of helicopter parameters such as number of blades, their length and velocity of angular rotation and finally identification of helicopter type are aims of this research. For this purpose, the previous methods for estimating the helicopter parameters are reviewed and classified. | ||
کلیدواژهها [English] | ||
MicroDoppler, Helicopter, Parameter Estimation, Radar | ||
مراجع | ||
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