IEEE - Aerospace and Electronic Systems - March 2021 - 51

Feng et al.
Table 4.

ACKNOWLEDGMENTS

Jamming Cancellation Capability As A Function
of Jamming Signal Power
Distance
no jamming

This work was supported in part by the FAST-LAB ANR
Grant, in part by the FIRST-TF Grant, and in part by the
Oscillator Instability Measurement Platform PIA ANR Grant.

Correct pos.(%) No sol.(%)

REFERENCES

100

0

10m00

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0/0

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9m00

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8m00

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7m50

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6m50

0/49

100/51

6m00

0/79

100/21

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0/0

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4m50

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Each entry is displayed as percentage of solution " before
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[3] M. L. Psiaki and T. E. Humphreys, " GNSS spoofing and
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CONCLUSION

[6] E. Schmidt, Z. Ruble, D. Akopian, and D. J. Pack,

This article demonstrates the ability to spoof GPS signals using widely available hardware by only taking
care of feeding the radio frequency front end with a stable enough local oscillator to generate a low phase
noise signal, the ability to detect spoofing through the
phase-difference measurement between the signals collected by two antennas, and the ability to tune the
antenna array null toward the spoofing emitter in order
to destructively interfere the spoofing signal and cancel
its contribution in order to recover the authentic constellation signal. All demonstrations have focused on
computational efficiency by working on the raw radio
frequency samples rather than tuning SDR GNSS
receiver acquisition and tracking procedure: Spoofing
detection is achieved by applying a computationally
efficient codeless decoding technique and phase-difference estimation, whereas spoofing suppression involves
a orthogonal projection method. Since we consider a
single spoofing emitter, an array with only two antennas
is sufficient to detect and suppress spoofing signals. If
more spoofing emitters are located at different positions, an array with more antennas is needed according
to the classical beamforming theory. The efficiency of
the algorithms is demonstrated by running real-time
spoofing detection and cancellation on the single-board
computer Raspberry Pi4 with the modified gnss-sdr
signal source processing available at https://github.com/
oscimp/gnss-sdr.
MARCH 2021

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[8] A. Jafarnia-Jahromi, A. Broumandan, J. Nielsen, and
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IEEE A&E SYSTEMS MAGAZINE

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