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121 research outcomes, page 1 of 13
  • publication . Article . 2008
    Open Access English
    Authors:
    Daniele Borio; Letizia Lo Presti;
    Persistent Identifiers
    Publisher: Hindawi Publishing Corporation

    With the advent of new global navigation satellite systems (GNSS), such as the European Galileo, the Chinese Compass and the modernized GPS, the presence of new modulations allows the use of special techniques specifically tailored to acquire and track the new signals. ...

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  • publication . Article . 2010
    Open Access
    Authors:
    Umar Iqbal; Jacques Georgy; Michael J. Korenberg; Aboelmagd Noureldin;
    Persistent Identifiers
    Publisher: Hindawi Limited

    Present land vehicle navigation relies mostly on the Global Positioning System (GPS) that may be interrupted or deteriorated in urban areas. In order to obtain continuous positioning services in all environments, GPS can be integrated with inertial sensors and vehicle o...

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  • publication . Article . 2011 . Embargo End Date: 13 Jun 2011
    Open Access
    Authors:
    Niamh O'Mahony; Gérard Lachapelle; Colin C. Murphy;
    Publisher: Hindawi Publishing Corporation

    A new approximation for the distribution of the probability ratio in a sequential probability ratio test (SPRT) using noncoherent integration across a full code period is presented. The new approximation is valid for the carrier-to-noise power ratios (C/N0) typically en...

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  • publication . Article . 2012
    Open Access
    Authors:
    J. Nielsen; Vahid Dehghanian; Gérard Lachapelle;
    Persistent Identifiers
    Publisher: Hindawi Limited

    A perceived emerging threat to GNSS receivers is posed by a spoofing transmitter that emulates authentic signals but with randomized code phase and Doppler over a small range. Such spoofing signals can result in large navigational solution errors that are passed onto th...

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  • publication . Article . 2010
    Open Access
    Authors:
    Iness Ahriz; Yacine Oussar; Bruce Denby; Gérard Dreyfus;
    Persistent Identifiers
    Publisher: Hindawi Limited

    Indoor handset localization in an urban apartment setting is studied using GSM trace mobile measurements. Nearest-neighbor, Support Vector Machine, Multilayer Perceptron, and Gaussian Process classifiers are compared. The linear Support Vector Machine provides mean room...

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  • publication . Article . 2008
    Open Access
    Authors:
    Francesca Giordano; Alberto Marini;
    Persistent Identifiers
    Publisher: Hindawi Limited

    Land degradation and desertification processes represent a serious problem in many areas of Sardinia (Italy), as in the Nurra region where urbanization, overgrazing, and fires have induced environmental degradation and rapid land-use change. In this study, using satelli...

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  • publication . Article . 2014
    Open Access English
    Authors:
    Luciano Musumeci; Fabio Dovis;
    Persistent Identifiers
    Publisher: Hindawi Publishing Corporation

    Radio frequency interference detection and mitigation are becoming of paramount importance due to the increasing number of services and applications based on the position obtained by means of Global Navigation Satellite Systems. A way to cope with such threats is the im...

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  • publication . Article . 2012
    Open Access
    Authors:
    Muhammad Tahir; Letizia Lo Presti; Maurizio Fantino;
    Persistent Identifiers
    Publisher: Hindawi Limited

    The problem of designing robust systems to track global navigation satellite system (GNSS) signals in harsh environments has gained high attention. The classical closed loop architectures, such as phase locked loops, have been used for many years for tracking, but in ch...

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  • publication . Article . 2014
    Open Access English
    Authors:
    Gaetano Castaldo; Antonio Angrisano; Salvatore Gaglione; Salvatore Troisi;
    Persistent Identifiers

    Satellite navigation is critical in signal-degraded environments where signals are corrupted and GNSS systems do not guarantee an accurate and continuous positioning. In particular measurements in urban scenario are strongly affected by gross errors, degrading navigatio...

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  • publication . Article . 2015
    Open Access English
    Authors:
    Naveen S. Gowdayyanadoddi; James T. Curran; Ali Broumandan; Gérard Lachapelle;
    Persistent Identifiers
    Publisher: Hindawi Publishing Corporation

    Multipath propagation is one of the major sources of error in GPS measurements. In this research, a ray-tracing technique is proposed to study the frequency domain characteristics of multipath propagation. The Doppler frequency difference, also known as multipath phase ...

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121 research outcomes, page 1 of 13