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مکانیابی اهداف در رادارهای چند ورودی چند خروجی با آنتن‌های توزیع‌یافته | ||
| رادار | ||
| دوره 8، شماره 1 - شماره پیاپی 23، شهریور 1399، صفحه 1-13 اصل مقاله (541.84 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
| روح الله امیری؛ فریدون بهنیا* | ||
| دانشگاه صنعتی شریف | ||
| تاریخ دریافت: 05 فروردین 1399، تاریخ بازنگری: 28 بهمن 1399، تاریخ پذیرش: 28 اردیبهشت 1399 | ||
| چکیده | ||
| در این مقاله، مسأله مکانیابی بیضوی اهداف در رادارهای چند ورودی چند خروجی با آنتن‌های توزیع‌یافته بررسی شده است. هدف مکانیابی بیضوی، تخمین موقعیت هدف از روی دستهای از اندازهگیریهای نویزی تأخیر بایاستاتیک میباشد. از آنجاییکه تخمین ML متناظر با مکانیابی بیضوی مسألهای غیرمحدب میباشد، استفاده از روشهای عددی برای حل آن میتواند منجر به همگرایی به نقاط کمینه محلی شود. برای رفع این مشکل، در این مقاله تخمینگرهایی (عموماً شکلبسته) برای حل مسأله مکانیابی ارائه شده است که این الگوریتمها برای همگرایی به پاسخ سراسری مشکلی نخواهند داشت. روشهای ارائه شده، از نظر عملکردی تا سطوح نسبتاً بالای نویز کارا بوده و به باند کرامر-رائو میرسند. این روشها دقت مکانیابی بالاتری نسبت به روشهای موجود دارند. همچنین، با توجه به ذات شکلبسته و جبری روشهای ارائهشده، پیچیدگی محاسباتی آنها بسیار پایین است. البته از این نظر، عملکرد سایر روشهای شکلبسته موجود در ادبیات نیز مشابه میباشد. لازم به‌ذکر است که ایدههای ارائهشده در این مقاله میتواند به‌عنوان پایهای برای ادامه پژوهش در حوزه مکانیابی راداری در نظر گرفته شود. | ||
| کلیدواژه‌ها | ||
| مکانیابی اهداف؛ رادارهای چند ورودی چند خروجی؛ باند کرامر-رائو؛ تخمین‌گر حداقل مربعات وزن‌دار؛ تأخیر بایاستاتیک | ||
| عنوان مقاله [English] | ||
| Target Localization in MIMO Radars with Distributed Antennas | ||
| نویسندگان [English] | ||
| R. Amiri؛ F. Behnia | ||
| Sharif University of Technology | ||
| چکیده [English] | ||
| In this paper, the problem of elliptic target localization in distributed multiple-input multiple-output (MIMO) radars is investigated. The goal of elliptic localization is to estimate the target position from a set of noisy bistatic delay measurements. Since the maximum likelihood (ML) problem associated with elliptic localization is nonconvex, iterative methods can be trapped in local minimums, leading to inaccurate location estimation. To solve this problem, a number of (almost closed-form) estimators are proposed, which can locate the target without convergence concern. The proposed methods are efficient, achieving Cramer-Rao lower bound (CRLB) up to relatively high noise levels. These methods are of superior localization accuracy in comparison with the state-of-the-art methods. Furtheremore, according to the closed-form and algebraic nature of the proposed methods, they have very low computational complexity, which is similar to other existing closed-form methods in the literature. It should be noted that the ideas presented in this paper can be considered as a baseline for future research studies in the area of localization in radar systems. | ||
| کلیدواژه‌ها [English] | ||
| Target Localization, MIMO Radars, Cramer-Rao Lower Bound (CRLB), Weighted Least Square Estimation, Bistatic Delay | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 673 تعداد دریافت فایل اصل مقاله: 395 |
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