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Research ArticleRegular Papers
Open Access

Efficient Signal Quality Monitoring of GNSS Signals Disturbed by Evil Waveforms

Fernando D. Nunes and Fernando M. G. Sousa
NAVIGATION: Journal of the Institute of Navigation December 2024, 71 (4) navi.668; DOI: https://doi.org/10.33012/navi.668
Fernando D. Nunes
1Instituto de Telecomunicações, Lisboa, Portugal
2Instituto Superior Técnico, Universidade de Lisboa, Portugal
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Fernando M. G. Sousa
1Instituto de Telecomunicações, Lisboa, Portugal
3Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, Portugal
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  • FIGURE 1
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    FIGURE 1

    Typical waveforms for TM-A1 with BOCs(m, m) signals and |d| ≤ Tc

  • FIGURE 2
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    FIGURE 2

    Cross-correlation between the incoming signal y(t) and the local replica g(t)

  • FIGURE 3
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    FIGURE 3

    Cross-correlation RA,BPSK(τ) for different lags D with BTc = 1; modulation: BPSK(m)

  • FIGURE 4
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    FIGURE 4

    Cross-correlation RA(τ) for different lags D with BTc = 10; modulation: BOCs(m, m)

  • FIGURE 5
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    FIGURE 5

    Cross-correlation Rϵ,11(τ)

  • FIGURE 6
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    FIGURE 6

    Cross-correlation RA(τ) for TM-A2 with BTc = 8 and different values of D11 and D61; modulation: CBOCpilot

  • FIGURE 7
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    FIGURE 7

    Cross-correlation RA(τ) for TM-B with fd = 8 MHz and σ = 8.8 Mnepers/s; modulation: BPSK(1)

  • FIGURE 8
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    FIGURE 8

    Range errors in meters for TM-B with BPSK(1) signals and BTc = 5

  • FIGURE 9
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    FIGURE 9

    Cross-correlation RA(τ) for TM-B with fd = 8 MHz and σ = 8.8 Mnepers/s; modulation: BOCs(1,1)

  • FIGURE 10
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    FIGURE 10

    Scheme of the correlator bank

  • FIGURE 11
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    FIGURE 11

    Detectability regions for TM-A1 with BPSK(1) and different bandwidths

  • FIGURE 12
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    FIGURE 12

    Hazard regions for TM-A1 with BPSK(1), MERR = 2 m, and different bandwidths

  • FIGURE 13
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    FIGURE 13

    Detectability regions for TM-B with BPSK(1) and different signal-to-noise ratios

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NAVIGATION: Journal of the Institute of Navigation: 71 (4)
NAVIGATION: Journal of the Institute of Navigation
Vol. 71, Issue 4
Winter 2024
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Efficient Signal Quality Monitoring of GNSS Signals Disturbed by Evil Waveforms
Fernando D. Nunes, Fernando M. G. Sousa
NAVIGATION: Journal of the Institute of Navigation Dec 2024, 71 (4) navi.668; DOI: 10.33012/navi.668

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Efficient Signal Quality Monitoring of GNSS Signals Disturbed by Evil Waveforms
Fernando D. Nunes, Fernando M. G. Sousa
NAVIGATION: Journal of the Institute of Navigation Dec 2024, 71 (4) navi.668; DOI: 10.33012/navi.668
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  • Article
    • Abstract
    • 1 INTRODUCTION
    • 2 THREAT MODEL A
    • 3 THREAT MODELS B AND C
    • 4 METRICS AND TESTS
    • 5 SIMULATION RESULTS
    • 6 FINAL REMARKS
    • HOW TO CITE THIS ARTICLE
    • ACKNOWLEDGMENTS
    • A COMPUTATION OF INTEGRAL IS2C
    • B ANALYTIC FORMULA OF RA,BPSK(τ) FOR TM-B
    • C GENERATION OF ARBITRARY GAUSSIAN VECTORS
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Keywords

  • evil waveforms
  • semi-analytic simulation
  • signal quality monitoring
  • threat models

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