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  • 1.
    Axell, Erik
    et al.
    Swedish Defence Research Agency, Department of Robust Telecommunications.
    Eklöf, Fredrik M.
    Swedish Defence Research Agency, Department of Robust Telecommunications.
    Alexandersson, Mikael
    Swedish Defence Research Agency, Department of Robust Telecommunications.
    Johansson, Peter
    Swedish Defence Research Agency, Department of Robust Telecommunications.
    Akos, Dennis
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, EISLAB.
    Jamming detection in GNSS receivers: Performance evaluation of field trials2015Ingår i: Navigation, ISSN 0028-1522, E-ISSN 2161-4296, Vol. 62, nr 1, s. 73-82Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We evaluate the detection performance of several commercial interference detectors and of a detector that uses the automatic gain control (AGC) level as a test statistic. The evaluations are based on actual measurements of GPS signals and different types of jamming signals, and were performed at the Vidsel test range in northern Sweden.The AGC detector and the Chronos CTL-3500 were shown to work well for all types of jamming signals. The J-alert was able to detect a wideband (20 MHz) signal but not the narrow band (<2 MHz) signals. By contrast, the jamming indicator on a Ublox 6H receiver was only able to detect a slowly varying modulated CW signal, but not signals with larger bandwidth (>2 MHz). We confirmed that C/N0-based Android application detectors could work well in static scenarios but are not suitable in dynamic scenarios, since they cannot distinguish between decreased GPS signal strength and increased interference

  • 2.
    Psiaki, M.L
    et al.
    Cornell University, Ithaca.
    Akos, Dennis
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, EISLAB.
    Thor, Jonas
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, EISLAB.
    A comparison of direct radio frequency sampling and conventional GNSS receiver architectures2005Ingår i: Navigation, ISSN 0028-1522, E-ISSN 2161-4296, Vol. 52, nr 2, s. 71-81Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The novel concept of a direct radio frequency (RF) sampling receiver front end was analyzed, experimentally tested, and compared with a traditional superheterodyne front end that uses mixing to downconvert the signal before sampling. This study's goal was to demonstrate that signal power and phase are not adversely influenced by the use of direct RF sampling. The direct RF sampling strategy examined in this work uses sampling rates that are much lower than the carrier frequency but more than twice the signal bandwidth. Such a system employs a bandpass filter in front of the analog-to-digital converter (ADC) to avoid sensitivity loss via aliasing of out-of-band noise and interfering signals. This design approach was evaluated analytically to determine the effects of sample clock jitter, and experimental results using GPS signals were used to confirm the analytical results. The results indicate that direct RF sampling yields performance equivalent to that of superheterodyne mixing

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