تخمین پارامترها و تشکیل تصویر هدف متحرک زمینی در رادار روزنه مصنوعی تک‌پایه ایستان

نویسندگان

1 فردوسی مشهد

2 دانشیار، گروه مهندسی برق، دانشکده مهندسی، دانشگاه فردوسی مشهد

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


عنوان مقاله [English]

Parameters Estimation and Imaging of Ground Moving Target in a One-stationary Bi-static SAR

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

 

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