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دانلود پروژه:تحلیل و بررسی روش های تجربی و تقریبی برای محاسبه میدان پراکنده شده از سطح آب دریا
تعداد 84 صفحه فایل word
چکیده
در این پایان نامه به بررسی میدانهای پراکنده شده امواج الکترومغناطیسی از سطح دریا میپردازیم. هدف اصلی این پایان نامه بررسی و مقایسه روشهای تحلیلی- تقریبی محاسبه میدان پراکنده میباشد. کاربرد عملی این پاین نامه در ارزیابی عملکرد رادارهای دریایی، ناوبری، هواشناسی و… میباشد.
در ابتدا به بررسی خصوصیات آماری سطح دریا میپردازیم و خواص الکترومغناطیسی آب دریا و انعکاس امواج از سطح دریا را بیان میکنیم. سپس روشهای تحلیل-تقریبی محاسبه میدان پراکندگی کرکف و اغتشاش کوچک ارزیابی خواهد شد. با توجه به اینکه سطح دریا سطحی تصادفی است و به عواملی مانند سرعت وزش باد و ارتفاع موج بستگی دارد انواع طیفهای آماری تجربی و نیمه تجربی که سطح دریا را مدلبندی میکنند مثل پیرسون-مسکوویچ، جانسواپ، الفوهیلی و…. را مورد بررسی قرار میدهیم. همچنین مدل عددی سوان نیز که سطح دریا را توصیف میکند بیان خواهد شد. با کمک نرمافزار MATLAB تولید سطح دریا انجام میدهیم. دو نوع سطح با استفاده از این نرمافزار تولید خواهیم کرد ابتدا سطحی گوسی با سرعتهای مختلف و سپس سطحی با استفاده از دو طیف پیرسون- مسکوویچ و جانسواپ تولید خواهیم کرد. در نهایت با استفاده از همین نرمافزار میدانهای پراکنده شده با استفاده از دو روش کرکف و اغتشاش کوچک را از سطح دریا گوسی را محاسبه خواهیم نمود و به مقایسه این دو روش خواهیم پرداخت.
کلمات کلیدی: سطح دریا ، پراکندگی، ارتفاع موج، روش تجربی، روش اغتشاش کوچک، روش کرکف، طیف پیرسون-مسکوویچ، طیف جانسواپ، طیف الفوهیلی
27 دیدگاه برای دانلود پروژه:تحلیل و بررسی روش های تجربی و تقریبی برای محاسبه میدان پراکنده شده از سطح آب دریا
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