ساختاری با پیچیدگی کم برای تشخیص جهت ورود سیگنال‌های همدوس منابع نامشخص در زوایای کناری آنتن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 شهید رجائی

2 تربیت دبیر شهید رجائی

چکیده

در تخمین جهت ورود سیگنال های همدوس، شیروانی مقدم و کشاورزنسب روشی مبتنی بر آرایه خطی یکنواخت پیشنهاد دادند که ابتدا تعداد منابع ناهمدوس را تعیین کرده و سپس جهت ورود سیگنال های همدوس را تخمین میزند. زمانی که سیگنال ها در زوایای کناری آنتن دریافت می شوند، آرایه خطی یکنواخت در تشخیص منابع کارایی مناسبی ندارد. هدف اصلی این مقاله، ارائه روشی جدید با استفاده از الگوریتم JADE-MUSIC مبتنی بر مقدار آستانه است که شامل دو قسمت است. شبیه سازی ها نشان می دهند که این روش جدید، در تخمین جهت ورود سیگنال های باند باریک نسبت به آرایه های خطی یکنواخت و صلیبی کارایی بالاتری دارد ضمنا بار محاسباتی کمتری نسبت به این ساختارها داراست.

کلیدواژه‌ها

عنوان مقاله [English]

A Low-Complexity Setup for DOA Estimation of Coherent Signals of Unknown Sources Located at Endfire Angles

نویسندگان [English]

  • Shahryar Shirvani Moqaddam 1
  • Akbar Keshavarz nasab 2
1
2
چکیده [English]

Estimating direction of arrival (DOA) is more complicated when unknown non-coherent sources
contain coherent signals or when sources are coherent. Recently, a new method based on
uniform linear array (ULA) has been proposed that first determines the number of non-coherent
sources and then estimates the DOA of coherent signals in each group. ULA is more applicable
for DOA estimation but for estimating DOAs close to the array endfire, this configuration does
not perform well or signals may be missed. Cross array (CA) is a suggestion to solve this
problem but it offers a lower performance for middle angles and introduces more computational
complexity. As the main goal of this investigation, using the proposed threshold-based JADEMUSIC algorithm, a new method is proposed which divides angles in two parts. For the angles which are in the range of [−60°, 60°], horizontal elements of CA and for endfire angles and the angles which are in the range of [−90°, −60°] and [60°, 90°], vertical elements of CA are considered. Simulation results demonstrate that the new proposed scenario offers a higher
performance for DOA estimation of narrowband signals with respect to ULA and CA
configurations. Also, its computational load is the same as the case that uses ULA. 

کلیدواژه‌ها [English]

  • ULA
  • CA
  • DOA estimation
  • EGM
  • FBSS
  • JADE-MUSIC algorithm

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رادار
دوره 4، شماره 1 - شماره پیاپی 1
651
اردیبهشت 1395
صفحه 11-21

فایل ها

سابقه مقاله

  • تاریخ دریافت: 17 خرداد 1394
  • تاریخ بازنگری: 02 بهمن 1402
  • تاریخ پذیرش: 28 شهریور 1397

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