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آشکارساز اهداف متحرک زمینی مبتنی بر آزمون نسبت درست‌نمایی تعمیم‌یافته در رادار دهانه مصنوعی تک کاناله با روش نگاشت فضای سیگنال | ||
| رادار | ||
| مقاله 7، دوره 7، شماره 1 - شماره پیاپی 21، شهریور 1398، صفحه 79-91 اصل مقاله (1.25 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
| مهدی استوان1؛ صادق صمدی2؛ محمدصادق هل فروش* 3 | ||
| 1دانشجوی دکتری دانشگاه صنعتی شیراز | ||
| 2استادیار، دانشگاه صنعتی شیراز | ||
| 3استاد، دانشگاه صنعتی شیراز | ||
| تاریخ دریافت: 22 خرداد 1397، تاریخ بازنگری: 31 شهریور 1398، تاریخ پذیرش: 10 آذر 1398 | ||
| چکیده | ||
| در این مقاله هدف بررسی تئوریک و به‌دست‌آوردن آشکارساز اهداف متحرک زمینی در رادار دهانه مصنوعی تک کاناله مبتنی بر روش‌های تئوری آشکارسازی است. بر این اساس ساختار آشکارساز اهداف متحرک زمینی از سیگنال خام دریافتی رادار دهانه مصنوعی مبتنی بر آزمون نسبت درست‌نمایی تعمیم‌یافته (GLRT) توسعه یافته است. بدین منظور پارامترهای مجهول سیگنال دریافتی از هدف متحرک زمینی شامل مکان در راستای سمت و سرعت هدف در هر دو راستای برد و سمت با تخمین MLجایگزین شده و سپس آزمون نسبت درست‌نمایی تعمیم‌یافته انجام می‌گردد که منجر به ساختار آشکارساز تخمین‌گر- همبسته ساز می‌گردد. تخمین پارامترهای مجهول سیگنال بازگشتی هدف که در ساختار آشکارساز پیشنهادی استفاده می‌گردد، نیازمند بهینه‌سازی یک تابع هدف از طریق جستجوی شبکه‌ای در فضای چند بعدی پارامترهای نامعلوم سیگنال بازگشتی است. جهت کاهش بار محاسباتی این جستجوی شبکه‌ای حجیم چند بعدی، از نگاشت فضای چند بعدی سیگنال دریافتی به چند فضای یک بعدی کاملاً معادل بهره جسته‌ایم. کارایی روش پیشنهادی بر اساس نتایج شبیه‌سازی با رسم منحنی‌های عملکرد آشکارساز و همچنین محاسبه بار محاسباتی نشان داده شده است. | ||
| کلیدواژه‌ها | ||
| رادار دهانه مصنوعی؛ آشکارساز نسبت درست‌نمایی تعمیم‌یافته؛ آشکارسازی هدف متحرک زمینی؛ جستجوی شبکه‌ای؛ نگاشت فضای سیگنال | ||
| عنوان مقاله [English] | ||
| Ground Moving Target Indicator Based on Generalized Likelihood Ratio Test (GLRT) in Single Channel SAR using Signal Space Mapping Method | ||
| نویسندگان [English] | ||
| M. Ostovan1؛ S. Samadi2؛ M. S. Helforoush3 | ||
| 1Ph.d. Student Shiraz University of Technology | ||
| 2Assistant Professor, Shiraz University of Technology | ||
| 3Professor, Shiraz University of Technology. | ||
| چکیده [English] | ||
| In this paper, the goal is theoreticaly investigating and presenting a ground moving target detector in single channel SAR based on detection theory methods. Accordingly, the detector structure for ground moving targets has been developed based on generalized likelihood ratio test (GLRT) from raw received signal. For this purpose, unknown parameters of the ground moving target’s returned signal, including azimuth location and velocity in both azimuth and range directions are replaced with their ML estimations. Then, generalized likelihood ratio test is performed which leads to estimator-correlator detection structure. Estimation of the unknown parameters of the target reflectivity which is necessary for the proposed detector, needs optimization of an objective function through a grid search in multidimensional space of the unknown reflectivity parameters. To reduce the computational load of this massive multidimensional grid search, conversion of the multidimensional received signal space to equivalent several 1D spaces is used. Effectiveness of the proposed method is demonstrated through experimental results by evaluation of detection performance curves. | ||
| کلیدواژه‌ها [English] | ||
| Synthetic Aperture Radar (SAR), Generalized Likelihood Ratio Test (GLRT), Ground Moving Target Indication, Grid Search, Signal Space Mapping | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 555 تعداد دریافت فایل اصل مقاله: 295 |
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