کاهش خطای فریب GPS با استفاده از تخمین‎گر تطبیقی در حلقه ردیابی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی برق، دانشگاه علم و صنعت ایران

چکیده

یکی از عوامل ایجاد خطا در ردیابی گیرنده‌های GPS حملاتی نظیر فریب است. هدف از این حملات محاسبه نادرست مکان و زمان می باشد. فریبنده از طریق ایجاد تداخل در سیگنال اصلی باعث ایجاد فریب می‎شود که این تداخل شکل‎های مختلفی دارد. تداخل بررسی‎شده در این مقاله فریب از نوع تأخیری است. در واقع هدف، ارائه روشی جدید در قسمت ردیابی سیگنال GPS است که به‎واسطه آن بتوان تأثیر فریب ایجاد شده را کاهش داد. الگوریتم پیشنهادی دو بخش اصلی دارد. بخش نخست شامل تخمین میزان تأخیر فریب است. پس از آن با یک روش ابتکاری تأثیر سیگنال فریب در بخش همبسته ساز حلقه ردیابی استخراج و از کل سیگنال ورودی کاسته می‌گردد. بدین ترتیب که ابتدا میزان تأثیر فریب، تخمین زده شود و سیگنال فریب تخمینی به‎دست آید. برای این منظور دو تخمین‌گر برپایه چندهمبسته‌ساز و تطبیقی ارائه شده است. همبستگی این سیگنال و سیگنال دیجیتالی IF محاسبه شده و وارد بخش کاهش فریب می‌گردند. در بخش کاهش فریب همبستگی سیگنال بدست آمده با خودهمبستگی سیگنال دریافتی جمع شده و همبستگی سیگنال GPS معتبر استخراج می گردد. پس از اعمال الگوریتم پیشنهادی، خطای ردیابی سیگنال به‎طور میانگین حدود 88 درصد کاهش می‎یابد.

کلیدواژه‌ها

عنوان مقاله [English]

GPS Spoofing Mitigation using Adaptive Estimator in Tracking Loop

نویسندگان [English]

  • Maryam Moazedi
  • Seyyed Mohammad Reza Mousavi
  • Zahra Nasrpooya
  • Ali Sadr
چکیده [English]

The attacks such as spoofing is one of the main sources of error in tracking of Global Positioning System (GPS) receivers. The aim of these attacks is to calculate fake time and position. The spoofer sends the counterfeit signal and causes to spoof. This counterfeit signal is generated in different ways. In this paper, the studied interference is the delay spoof. Indeed, the aim is introducing a new approach in tracking loop of the GPS receiver in order to decrease the generated delay by spoof attack. The suggested algorithm has two main steps. The first step estimates the amount of delay spoof. Subsequently, through an innovative approach, the effect of spoofing signal is extracted and then subtracted from the total measured correlation function. To achieve that, the effect of spoofing signal is estimated and the estimated spoofing signal is generated separately. For this purpose, two estimator based on multi-correlator and adaptive approach is introduced. Correlation of this signal with the digital IF signal is calculated and entered into the spoof mitigation part. In this part, correlation of this signal is added to auto-correlation of received signal and correlation of authentic signal is achieved. These techniques provide easy-to-implement and quality assurance tools for anti-spoofing. Applying the proposed algorithm decreases the average spoofing error by 88%.

کلیدواژه‌ها [English]

  • GPS Receiver
  • Spoofing Attack
  • Delay Lock Loop
  • Narrow Band Correlator

مراجع

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سابقه مقاله

  • تاریخ دریافت: 27 آذر 1396
  • تاریخ بازنگری: 19 اردیبهشت 1397
  • تاریخ پذیرش: 06 خرداد 1397
  • تاریخ انتشار: 01 آذر 1397

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