Application of Novel Signal Processing Algorithms for the Detection and Minimization of Skywave Interfering Signals in Loran Receivers

Document type: Bookchapters
Peer reviewed: Yes
Author(s): Abbas Mohammed, David Last
Title: Application of Novel Signal Processing Algorithms for the Detection and Minimization of Skywave Interfering Signals in Loran Receivers
Book: Applied Signal and Image Processing: Multidisciplinary Advancements
Year: 2011
Pagination: 28-44
Editor: Rami Qahwaji, Roger Green, Evor Hines
ISBN: 978-1-60960-477-6
Publisher: IGI Global
City: Hershey
URI/DOI: 10.4018/978-1-60960-477-6.ch002
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Electrical Engineering (Sektionen för ingenjörsvetenskap - Avd. för elektroteknik)
School of Engineering S-371 79 Karlskrona
+46 455 38 50 00
http://www.bth.se/ing/
Authors e-mail: amo@bth.se
Language: English
Abstract: Skywave interference commonly affects Loran receivers’ performance. Traditional skywave rejectionmethods that use fixed, worst-case, sample timing are far from optimal. This chapter reports on novel signal processing techniques for measuring in real-time the delay and strength of the varying skywave components of a Loran signal relative to the groundwave pulse. The merits and limitations of these techniques will be discussed. Their effectiveness will be assessed by theoretical analysis, computer simulations under a range of realistic conditions, and by testing using off-air signals. A prototype Loran system employing the proposed techniques is also presented. This work establishes a basis on which to design a Loran receiver capable of adjusting its sampling point adaptively to the optimal value in a constantly-changing skywave environment. Such receivers promise to improve significantly the accuracy and reliability of positioning under adverse operational conditions.
Subject: Telecommunications\General
Signal Processing\General
Keywords: Loran, Navigation, Skywave, Receivers
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