استفاده از روش‌های 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 در زمینه 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 ضربه 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 تشخیص‌داده‌شده، با استفاده از روش پیشنهادی، 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 نشان می‌دهند که روش پیشنهادی توانایی جداسازی مناسب هدف از تصویر آن را در شرایط مختلف داراست.

کلیدواژه‌ها

عنوان مقاله [English]

Using Iterative-Based Methods in Multiple-Input Multiple-Output Synthetic Aperture Radar for Target-Image Separation

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]

Estimating the angle of arrival of waves in the low-altitude scenario is a challenging issue in the field of phased array radars. This problem generally occurs when a target moves at low altitude, and the signal received directly from the target coincides with the signal received from its reflection off the ground, simultaneously entering the receiver and disrupting the angle estimation. Many articles have investigated and addressed this issue in phased array radars using high-resolution separation methods. In this paper, we focus on solving this problem in multiple-input multiple-output radars. Specifically, we concentrate on impulse and synthetic aperture radars. The proposed method consists of two steps: first, the range, azimuth angle, and approximate elevation angle of the target are estimated using a matched filter; then, the proposed method is applied around the detected elevation angle to separate the target from its image. The term "image" refers to the reflection of a target from the ground surface, which creates a false target in the receiver. The results obtained demonstrate that the proposed method is capable of effectively separating the target from its image under various conditions.

کلیدواژه‌ها [English]

  • SIAR
  • MIMO
  • Super resolution
  • Low angle

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رادار
دوره 10، شماره 2 - شماره پیاپی 28
شماره پیاپی 28، فصلنامه پاییز و زمستان
دی 1401
صفحه 31-38

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سابقه مقاله

  • تاریخ دریافت: 02 آبان 1401
  • تاریخ بازنگری: 23 آذر 1401
  • تاریخ پذیرش: 10 دی 1401
  • تاریخ انتشار: 01 بهمن 1401

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