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Research ArticleOriginal Article
Open Access

Detection of GPS C/A Code Self-Interference: Monitor Overview and Applicability

Jessica Belzer and Frank van Graas
NAVIGATION: Journal of the Institute of Navigation March 2023, 70 (1) navi.559; DOI: https://doi.org/10.33012/navi.559
Jessica Belzer
Ohio University
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Frank van Graas
Ohio University
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  • FIGURE 1
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    FIGURE 1

    Observation locations used in simulator experiment

  • FIGURE 2
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    FIGURE 2

    Code minus carrier measurements and bias value without smoothing for PRN 3

  • FIGURE 3
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    FIGURE 3

    Code-minus-carrier measurements and bias value without smoothing for PRN 13

  • FIGURE 4
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    FIGURE 4

    FDCC detector test statistic and threshold under H0 (left distribution) and under H1 (right distribution)

  • FIGURE 5
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    FIGURE 5

    FDCC monitor signal for PRN 3

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    FIGURE 6

    FDCC monitor signal for PRN 3 over epoch 4

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    FIGURE 7

    FDCC monitor signal spectrum for PRN 3 over epoch 4

  • FIGURE 8
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    FIGURE 8

    30-s smoothed CMC for PRN 3 over the duration of simulated event

  • FIGURE 9
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    FIGURE 9

    FDCC monitor signal for PRN 13

  • FIGURE 10
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    FIGURE 10

    FDCC monitor signal for PRN 13 over epoch 4

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    FIGURE 11

    FDCC monitor signal spectrum for PRN 13 over epoch 4

  • FIGURE 12
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    FIGURE 12

    30-s smoothed CMC for PRN 13 over the duration of the simulated event

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    FIGURE 13

    CMC measurements and bias value with smoothing for PRN 3

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    FIGURE 14

    Doppler crossover observation times relative to stationary antenna crossover

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    TABLE 1

    Self-Interference Event Parameters

    Satellite (C/A code)PRN 13PRN 3
    Relative signal strength+10 dB−10 dB
    Maximum theoretical pseudorange error0.59 m5.91 m
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    TABLE 2

    FDCC Detector Applicability Summary

    Self-interference concernsRequirementFDCC Detector applicability
    Pseudorange error bound1.6 [m] with 10−9 probabilityYes
    Time to alert2 [s]Yes
    Reduced smoothing time constant30 [s]Yes
    Ghost satellitesNo need to track all satellites that could introduce self-interferenceYes
    Flex powerOperate in the presence of large power differences between satellitesYes

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NAVIGATION: Journal of the Institute of Navigation: 70 (1)
NAVIGATION: Journal of the Institute of Navigation
Vol. 70, Issue 1
Spring 2023
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Detection of GPS C/A Code Self-Interference: Monitor Overview and Applicability
Jessica Belzer, Frank van Graas
NAVIGATION: Journal of the Institute of Navigation Mar 2023, 70 (1) navi.559; DOI: 10.33012/navi.559

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Detection of GPS C/A Code Self-Interference: Monitor Overview and Applicability
Jessica Belzer, Frank van Graas
NAVIGATION: Journal of the Institute of Navigation Mar 2023, 70 (1) navi.559; DOI: 10.33012/navi.559
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  • Article
    • Abstract
    • 1 INTRODUCTION
    • 2 THEORY AND METHODS
    • 3 FDCC DETECTOR GENERATION AND SIGNAL SCREENING
    • 4 BIAS-VALUE MONITOR
    • 5 DETECTOR OPTIONS AND RECOMMENDATION
    • 6 CONCLUSION
    • HOW TO CITE THIS ARTICLE
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Keywords

  • GBAS
  • GPS cross correlation
  • GPS self-interference
  • ground based augmentation system

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