تخمین پارامترهای هدف متحرک زمینی در رادار دهانه مصنوعی لوچ تک آنتنی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 فردوسی مشهد

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

چکیده

در این مقاله با در نظر گرفتن یک زاویه لوچ برای رادار دهانه مصنوعی در شیوه نواری، روشی برای تخمین پارامترهای هدف متحرک با شتاب
ثابت ارائه شده است. وجود مرکز داپلر غیر صفر و اتصال میان برد و سمت در حالت لوچ سبب پیچیده شدن معادلات و به وجود آمددن ابهدام
داپلر می گردد. بنابراین، تبدیل کی استون کارایی خود را از دست می دهد. همچنین روش تبدیل رادون در حالت لوچ برای تعیین مرکدز داپلدر
بدون ابهام، دقت کافی ندارد. بنابراین، روشی برای بهبود دقت تبدیل رادون با استفاده از یک الگوریتم مبتنی بدر هندسده ارائده مد ی شدود کده
می تواند مهاجرت برد خطی را به خوبی اصلاح کند. سپس با استفاده از روش تبدیل فوریه چندجملده ای، پارامترهدای داپلدر مرتبده دو، سده و
همچنین با تخمین پهنای باند داپلر، زمان دهانه مصنوعی هدف متحرک بهدست می آید. شبیه سازی دقت روابط و قدرت الگوریتم پیشدنهادی
را برای تخمین پارامترهای هدف، تنها با یک آنتن تأیید می کند.

کلیدواژه‌ها

عنوان مقاله [English]

Estimation of Ground Moving Target Parameters in Squint Single-Antenna Synthetic Aperture Radar

نویسندگان [English]

  • Seyed Mohammad Zabihi Maddah 1
  • Seyed Alireza Seyedin 2
1
2
چکیده [English]

In this paper, by considering a squint angle for synthetic aperture radar in the strip-map mode, a
method is proposed for estimating parameters of a fixed acceleration moving target. Non-zero
Doppler centroid and range-azimuth coupling in the squint mode add complexity to estimation
equations of moving target parameters and cause Doppler ambiguity. This, in turn, causes to
lose the efficiency of using the keystone transform. Furthermore, Radon transform in the squint
mode will not give accurate results in determining the unambiguous Doppler centroid. Hence, in
this paper, by using a Geometry-based Doppler centroid estimator, an approach is proposed to
improve the precision of Radon transform which is capable to correct linear range migration.
Finally, by employing local polynomial Fourier transform, Doppler parameters of order two and
three are obtained. By estimating Doppler bandwidth, the target synthetic aperture time is then
obtained. The accuracy of our derived equations is examined and verified by simulation just
using a single antenna.

کلیدواژه‌ها [English]

  • Synthetic Aperture Radar (SAR)
  • Squinted SAR
  • Ground Moving Target
  • Parameter Estimation

مراجع

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فایل ها

سابقه مقاله

  • تاریخ دریافت: 29 مهر 1395
  • تاریخ بازنگری: 02 بهمن 1402
  • تاریخ پذیرش: 28 شهریور 1397

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