اندازه‌گیری چندمسیری در دریا، شبیه‌سازی و تخمین کانال آکوستیکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مخابرات، دانشکده مهندسی فناوری اطلاعات و ارتباطات، دانشگاه جامع امام حسین علیه السلام، تهران، ایران

2 گروه مخابرات، دانشکده مهندسی اطلاعات و ارتباطات، دانشگاه جامع امام حسین علیه السلام، تهران ، ایران

3 دانشگاه شیراز

4 دانشکده علوم مهندسی، پردیس دانشکده های فنی، دانشگاه تهران

چکیده

اهمیت شناخت کانال آکوستیک زیرآب و اثرات آن روی سیگنال‌های آکوستیکی، با توجه به کاربردهای فراوان آن در زمینه‌های مختلف مانند پایش محیط، اکتشاف در اقیانوس‌ها و عملیات نظامی، روزبه‌روز در حال افزایش است. در مقالة حاضر به شبیه‌سازی اثر چند مسیری در محیط زیر آب، بر اساس مدل‌سازی‌ها پرداخته و با حل معادله‌های سیگنال دریافتی در یک آرایه چندسنسوری، نتایج حاصله در خصوص تابع توزیع چگالی احتمال، کشیدگی، چولگی، کپستروم، تابع پراکندگی، تأخیر پخش‌شدگی کانال و میزان انعکاس موجود در کانال ارائه شده است. رفتار سیگنال در یک آرایه خطی، نسبت به یک منبع ثابت با مدل‌سازی سیگنال دریافتی بررسی و تحلیل شده است. همچنین اندازه‌گیری‌های میدانی در خصوص بررسی پدیدۀ چند مسیری در دریا صورت پذیرفته و سناریوی اندازه‌گیری، تحلیل سیگنال و نتایج در خصوص پاسخ ضربه و رفتار آماری سیگنال در آزمون میدانی ارائه شده است. نتایج حاصل از تحلیل داده‌های واقعی، تطابق مناسبی با توزیع ناکاگامی برای اندازه سیگنال آکوستیکی عبوری از دریا نشان داده است.

کلیدواژه‌ها

عنوان مقاله [English]

Multipath Measurement in the Sea, Simulation and Estimation of Underwater Acoustic channel

نویسندگان [English]

  • Abbas Asadzade 1
  • Seyed mohammad Alavi 2
  • Mahmood Karimi 3
  • Hadi Amiri 4
1 Department of Information and Communication Technology,IHCU,Tehran, Iran
2 Department of Information and Communication Technology,IHCU,Tehran, Iran
3 Shiraz University
4 School of Engineering Science, College of Engineering, University of Tehran
چکیده [English]

The importance of identifying underwater acoustic channels and their effects on signals is increasing due to its widespread use in various fields such as environmental monitoring, explorations in oceans and military operations. In this paper, we simulate the multi-path effect in underwater environment based on near-real-world models and by analyzing the received signal equations in a multi-sensor array. The results are expressed in terms of probability density, kurtosis, skewness, cepstrum and reflection volume in the channel. Based on received signal modeling, the signal behavior in a linear array is investigated and analyzed in a few depths relative to a fixed source. Moreover, to investigate the multi-path phenomenon, actual measurements were made in the sea and measurement scenario, signal analysis, results of the impulse response and its statistical behavior are presented. The results of real data analysis show that the magnitude of the acoustic signal transmitted by sea has a Nakagami distribution.
 

کلیدواژه‌ها [English]

  • Acoustic wave propagation
  • Acoustic signal processing
  • Multi-path
  • Receiver array
  • Chirp signal

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