ارائه یک الگوریتم جدید به منظور حذف تداخل موج پیوسته هم‌زمان درگیرنده‌ سامانه ناوبری لورن

نویسندگان

1 صنعتی مالک اشتر

2 دانشگاه صنعتی مالک اشتر تهران دانشکده مخابرات

چکیده

استفاده از سامانه زمین پایه لورن در ناوبری، به‌دلیل مصونیت در مقابل جمینگ و امکان بهبود کارآیی آن با استفاده از سخت افزارها و الگوریتم‌های پردازشی جدید، اخیرا بیشتر مورد توجه قرار گرفته است. منابع مختلف خطا که از جمله مهمترین آنها تداخل موج پیوسته (CWI) می‌باشد، باعث خطا در ردیابی فاز سیگنال شده، که این عامل باعث خطا در اندازه‌گیری زمان ورود و در نهایت کاهش دقت ناوبری می‌شود. در این مقاله به ارائه یک الگوریتم جدید به منظور حذف تداخل موج پیوسته هم‌زمان با استفاده از تحلیل ساختار پالس‌های لورن در حوزه زمان پرداخته شده است. این الگوریتم که از بار محاسباتی بسیار پایینی برخوردار می‌باشد عملکرد بسیار بهتری نسبت به روش‌های مرسوم داشته و پیاده‌سازی آن باعث بهبود کارآیی و افزایش دقت ناوبری سامانه می‌شود. نتایج حاصل از شبیه‌سازی نشان می‌دهد عملکرد الگوریتم پیشنهادی تقریبا مستقل ازSIR سیگنال دریافتی بوده و عامل محدود کننده در این الگوریتم تنها SNR سیگنال دریافتی است. الگوریتم پیشنهادی برای اندازه‌گیری زمان ورود (TOA)، عملا باعث حذف اثر تداخل هم-زمان ( برابر بهبود نسبت به روش های مرسوم میانگین‌گیری و کدگشایی فاز) می‌شود. این بهبود چشمگیر در ازای کاهش SIR دریافتی ناشی از تداخل موج پیوسته غیرهم‌زمان به اندازه حداکثر dB3، که می‌توان آن را با استفاده از یک فیلتر میان‌گذر به راحتی حذف نمود، حاصل می‌شود.

کلیدواژه‌ها

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پدافند الکترونیکی و سایبری
دوره 4، شماره 2 - شماره پیاپی 2
650
شهریور 1395
صفحه 23-38

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سابقه مقاله

  • تاریخ دریافت: 06 دی 1394
  • تاریخ بازنگری: 31 فروردین 1403
  • تاریخ پذیرش: 28 شهریور 1397

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