"استفاده از روش های مبتنی بر تکرار در رادار با ضربه و روزنه مصنوعی با چند ورودی – چند خروجی جهت تفکیک هدف از تصویر آن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشگاه صنعتی شریف، تهران، ایران

2 استاد، دانشگاه صنعتی شریف، تهران، ایران

چکیده

تخمین زاویه ورود موج در حالت ارتفاع پست، یک مسئله چالشی درزمینه انواع رادار‌های آرایه فازی است. این مسئله به‌صورت کلی زمانی رخ می‌دهد که هدف در ارتفاع پست حرکت کرده و سیگنال دریافتی از خود هدف با سیگنال دریافتی از بازتاب آن از زمین، با یکدیگر و به‌صورت هم‌زمان وارد گیرنده شده و زاویه سنجی را خراب ‌کنند. خیلی از مقالات با استفاده از روش‌های تفکیک بسیار بالا (Super Resolution)، اقدام به بررسی و حل این مسئله در رادار‌های آرایه فازی کرده‌اند. در این مقاله به حل این مشکل در رادار‌های چند ورودی-چند خروجی می‌پردازیم. در این زمینه، تمرکز بر روی رادار‌های با ایمپالس و روزنه مصنوعی است. روش ارائه‌شده در اینجا، دارای دو گام است، ابتدا برد و زاویه سمت و حدود زاویه ارتفاع هدف با استفاده از فیلتر منطبق تخمین زده می‌شوند و سپس در اطراف زاویه ارتفاع تشخیص داده‌شده، با استفاده از روش ارائه‌شده در اینجا، به تفکیک هدف و تصویر از یکدیگر خواهیم پرداخت. منظور از تصویر یک هدف، بازتاب آن از سطح زمین است که باعث ایجاد هدف جعلی در گیرنده خواهد شد. نتایج به‌دست‌آمده مشخص می‌کنند که روش پیشنهادی توانایی جداسازی مناسب هدف از تصویر آن را در شرایط مختلف دارا هست.

کلیدواژه‌ها


عنوان مقاله [English]

Employing iterative methods in synthetic aperture radar to clarify target and image.

نویسندگان [English]

  • Mohsen Pourjoula 1
  • Mohamad Mahdi Nayebi 2
  • mohammad karbasi 2
1 PhD student, Sharif University of Technology, Tehran, Iran
2 Professor, Sharif University of Technology, Tehran, Iran
چکیده [English]

Synthetic Impulse and Aperture Radar (SIAR) is a kind of Multiple Input Multiple Output (MIMO) radar. Like the other type or radars, angle estimation is a problem in SIAR too. The general way in all cases of MIMO radars of finding the direction of arrival (DOA) of any wave, is to using the matched filter search in the angle domain and report the peaks of the matched filter as DOA of targets. But in the low angle scenario, there are two targets too close to each other in elevation angle, one of them the direct reflection and the another one from the earth below the target. Inn this scenario, using the matched filter search does not work and would just report a single target with false angle.

In order to solve this problem in convectional phased array radars, many super resolution methods has been introduced in recent years. Here we would present the new method of angle resolvation of two target in SIAR case which is the special method in MIMO radars category and then its performance would be compared with other angle estimation methods.

کلیدواژه‌ها [English]

  • SIAR
  • MIMO radar
  • super resolution
  • IAA
  • Low Angle Estimation

Smiley face

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دوره 10، شماره 2 - شماره پیاپی 28
شماره پیاپی 28، فصلنامه پاییز و زمستان
دی 1401
  • تاریخ دریافت: 02 آبان 1401
  • تاریخ بازنگری: 23 آذر 1401
  • تاریخ پذیرش: 10 دی 1401
  • تاریخ انتشار: 01 بهمن 1401