بهبود تصویرسازی سه ‌‌بعدی در سونار روزنه ‌مصنوعی ‌معکوس چندپایه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مخابرات، دانشکدۀ مهندسی، دانشگاه فردوسی مشهد

2 گروه مهندسی برق، دانشکده مهندسی، دانشگاه فردوسی مشهد

چکیده

تعیین بعد سوم اهداف زیر آب، توسط سامانۀ سوناری، می­تواند در تصویرسازی سه بعدی و تشخیص هدف نقش مهمی ایفا نماید. در این مقاله، با به‌کارگیری سونار روزنه مصنوعی معکوس و استفاده از منبع مجازی بستر دریا و یک حسگر دوم، بعد سوم اهداف به‌دست آمده است. جهت به‌دست آوردن بعد سوم، از فاصله بین پراکنده‌ساز و دو آرتیفکت اصلی متناظر با آن در تصویر دو بعدی استفاده شده است. در صورت داشتن دو سامانۀ سونار، که دارای هر دو نقش فرستندگی و گیرندگی باشند، تفکیک‌پذیری به‌دست آوردن بعد سوم نسبت به حالت تک‌پایه که در مقالۀ قبلی نگارندگان مورد بررسی قرار گرفته است، به نحو چشمگیری افزایش یافته است. علاوه‌بر این، به‌دلیل داشتن این دو حسگر، تعداد بیشتری از پراکنده‌سازهای هدف در معرض دید حسگرها قرار می‌گیرند. با استفاده از اطلاعات دریافتی از این طریق می‌توان به دقت بیشتر در محاسبۀ بعد سوم و ساخت یک تصویر سه بعدی از هدف دست یافت. به‌علت اهمیت نظارت زیر آب، با استفاده از شیوۀ پیشنهادی، می‌توان از این سامانه جهت تشخیص دقیق‌تر اهداف در مقابله با تهدیدات و جهت کاربردهای پدافندی استفاده کرد.

کلیدواژه‌ها

عنوان مقاله [English]

Three Dimensional Imaging Improvement in Multistatic Inverse Synthetic Aperture Sonar

نویسندگان [English]

  • S. A. Erfani 1
  • S. A. Seyedin 2
1 Engineering Faculty, Ferdowsi University of Mashhad
2 Ferdowsi University, Mashhad
چکیده [English]

Determining the third dimension of the underwater targets, by the sonar system, can play an important role in three dimensional imaging and target recognition. In this paper, by applying the inverse synthetic aperture sonar and using the seabed virtual source and a second sensor, the third dimension of the targets is obtained. For obtaining the third dimension, we use the distance between the scatterer and its two main corresponding artifacts in the two dimensional image. In the case of having two sonar systems, with both the transmitting and receiving roles, the third dimension resolution is increased obviously, compared to the monostatic case explained in our previous paper. In addition, because of having these two sensors, more target scatterers will be in the view of sensors. By using the information obtained in this way, it is possible to achieve more accuracy in calculating the third dimension and create a three-dimensional image of the target.  Because of the importance of the underwater monitoring, using the proposed scenario, we can use this system for more accurate identification of the targets to counter the threats and for the defence applications.

کلیدواژه‌ها [English]

  • Inverse Synthetic Aperture Sonar
  • Three Dimensional Image Formation
  • Virtual Sources
  • Interferometry
  • Underwater Defence

مراجع

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سابقه مقاله

  • تاریخ دریافت: 01 مرداد 1399
  • تاریخ بازنگری: 24 شهریور 1399
  • تاریخ پذیرش: 17 آبان 1399

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