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| تعداد مقالات | 9,029 |
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تخمین پارامترها و تشکیل تصویر هدف متحرک زمینی در رادار روزنه مصنوعی تک‌پایه ایستان | ||
| رادار | ||
| مقاله 2، دوره 5، شماره 4، بهمن 1396، صفحه 11-24 اصل مقاله (1.37 M) | ||
| نویسندگان | ||
| سید محمد ذبیحی مداح* 1؛ سید علیرضا سیدین2 | ||
| 1فردوسی مشهد | ||
| 2دانشیار، گروه مهندسی برق، دانشکده مهندسی، دانشگاه فردوسی مشهد | ||
| تاریخ دریافت: 24 اردیبهشت 1396، تاریخ بازنگری: 07 اسفند 1397، تاریخ پذیرش: 28 شهریور 1397 | ||
| چکیده | ||
| در این مقاله روابط مربوط به سیگنال دریافتی از هدف متحرک زمینی با شتاب ثابت در یک حالت خاص از رادار روزنه مصنوعی دوپایه، به نام تک ایستان (one-stationary) در صفحه برد مایل استخراج شده است. در ساختار تک ایستان معمولاً به دلیل پهنای پرتو وسیع و با فرض حرکت شتابدار هدف (مانند اتومبیل)، انحنای برد بوجودآمده و ابهام داپلر بسیار بزرگ می‌باشد، بنابراین، روش‌هایی مانند تبدیل رادون (Radon) و تبدیل کیاستون (Keystone) کارایی خود را برای تخمین مرکز داپلر و حذف مهاجرت برد از دست می‌دهند. در این مقاله الگوریتمی دومرحله‌ای برای تخمین مرکز داپلرکه تلفیقی از تبدیل رادون و یک الگوریتم جستجو است ارائه می‌شود و سپس با استخراج یک دستگاه معادلات، تخمینی از سرعت و شتاب هدف حاصل می‌شود و درنهایت الگوریتم تشکیل تصویر هدف ارائه می‌گردد. شبیه‌سازی، دقت روابط و قدرت الگوریتم پیشنهادی را در حضور نویز و کلاتر در مقایسه با الگوریتم‌های مرسوم تأیید می‌کند | ||
| کلیدواژه‌ها | ||
| رادار دهانه مصنوعی دوپایه؛ هدف متحرک زمینی؛ تخمین پارامترها؛ کنتراست؛ تشکیل تصویر | ||
| عنوان مقاله [English] | ||
| Parameters Estimation and Imaging of Ground Moving Target in a One-stationary Bi-static SAR | ||
| نویسندگان [English] | ||
| Seyed Mohammad Zabihi Maddah1؛ Seyed Alireza Seyedin2 | ||
| چکیده [English] | ||
| In this paper, the equation of the received signal of a moving target with constant acceleration in a special case of Bi-static SAR, named one-stationary, is derived in a slant range plane. In the one-stationary geometry, usually range curvature and Doppler ambiguity is very large due to wide beam-width and assumption of accelerating movement of the target. Hence, transforms such as Radon and Keystone have little accuracy for both estimating Doppler centroid and removing range cell migration. In this paper, a two-step algorithm is proposed for estimation of Doppler centroid. That is a combination of radon transform and a search algorithm. Then, by extraction of a system of equations, an estimation of target’s velocity and acceleration is obtained and finally, an image formation algorithm is presented. Compared to usual algorithms, the accuracy of the derived equations and the strength of the proposed algorithm in the presence of noise and clutter are confirmed by simulations. | ||
| کلیدواژه‌ها [English] | ||
| Synthetic Aperture Radar (SAR), Bistatic SAR, Ground Moving Target, Parameter Estimation, Imaging | ||
| مراجع | ||
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