استخراج تصویر از اهداف با حرکت غیریکنواخت و شتاب ثابت در رادار دهانه ترکیبی معکوس مبتنی بر حسگری فشرده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی مالک اشتر، تهران، ایران

2 دانشگاه صنعتی مالک اشتر

چکیده

در تصویربرداری مبتنی بر حسگری فشرده (CS) در رادار دهانه ترکیبی معکوس (ISAR)، معمولاً حرکت یکنواختی برای اهداف در نظر گرفته می‌شود. بااین‌حال معمولاً در سناریوهای عملی، اهداف دارای حرکت غیریکنواخت هستند که این حرکت باعث ایجاد شیفت فرکانس داپلر متغیر با زمان شده و تصویر ISAR دچار ماتی خواهد شد. همچنین ازآنجاکه ماتریس پایه مورداستفاده در تصویربرداری ISAR مبتنی بر حسگری فشرده به پارامترهای حرکت چرخشی وابسته است، مقادیر این پارامترها نیز باید تخمین زده شود. این در حالی است که معمولاً رفتار اهداف نسبت به رادار به‌صورت همکارانه در نظر گرفته می‌شود؛ یعنی فرض می‌شود که حرکت اهداف از دید رادار از قبل شناخته‌شده است و مسئله تخمین پارامترها در نظر گرفته نمی‌شود. در این مقاله، روشی بهبودیافته به‌منظور استخراج تصویر مبتنی بر حسگری فشرده برای حرکت غیریکنواخت با شتاب ثابت و غیرهمکارانه اهداف پیشنهاد و بهترین نمایش تنک برای ماتریس پایه استخراج شده است. نتایج شبیه‌سازی نشان می‌دهد که الگوریتم پیشنهادی کارایی بهتری نسبت به سایر روش‌ها حتی بدون جبران سازی حرکت چرخشی دارد و همچنین کنتراست تصویر بالاتری ارائه می‌کند.

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