استخراج پیام در استاندارد پالس نهم سیستم ناوبری eLoran
الموضوعات :مهری لطفعلی زاده 1 , مرتضی شفیعی نیستانک 2 , محمد باقر نظافتی 3
1 - دانشکده مهندسی برق و کامپیوتر، دانشگاه صنعتی مالک‌اشتر، تهران، ایران
2 - دانشکده مهندسی برق و کامپیوتر، دانشگاه صنعتی مالک‌اشتر، تهران، ایران
3 - پژوهشگاه دانش‌های بنیادی، تهران، ایران
الکلمات المفتاحية: پالس نهم, شیفت پوش, شیفت فاز, لورن بهبودیافته (eLoran), مدولاسیون مکان پالس (PPM).,
ملخص المقالة :
در سیستم لورن بهبودیافته (eLoran) مبتنی بر پالس نهم، به‌منظور افزودن سازوکار انتقال داده به سیستم ناوبری، پالسی به گروه پالس‌های ناوبری افزوده شده که حاوی پیام است. استخراج پیام از سیگنال لورن شامل دو مرحله محاسبه تأخیر زمانی پالس داده نسبت به محل اصلی آن و کدبرداری داده است. در این مقاله روشی برای استخراج پیام سیگنال لورن در استاندارد پالس نهم پیشنهاد شده است. برای این منظور تأخیر زمانی پالس داده در دو مرحله شیفت پوش و شیفت فاز با استفاده از فیلترهای منطبق و تأخیر کسری محاسبه می‌شود. سپس کدبردار رید سولومون (RS) بر روی سمبل‌ها اعمال و نهایتاً پیام استخراج می‌گردد. همچنین در مقاله به منظور بهبود تخمین تأخیر پالس، به‌خصوص در محیط‌های نویزی و در حضور تداخلات، پالس مرجع به صورت میانگین هشت پالس قبل از پالس داده پیشنهاد شده و به این ترتیب پالس مرجع برای استخراج هر سمبل متفاوت خواهد بود. مطابق نتایج ارزیابی، نرخ خطا قبل از کدبرداری حدود 08/0 تا 003/0 در نسبت سیگنال به نویزهای 7 تا 15 دسی‌بل است که بعد از تصحیح خطای کدبرداری به طور محسوسی کاهش می‌یابد.
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