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Output of the detecting correlator. The orange curve: magnitude, blue curve: phase. The red dots indicate signal detection (1: Signal detected, 0: Signal not detected.

Output of the detecting correlator. The orange curve: magnitude, blue curve: phase. The red dots indicate signal detection (1: Signal detected, 0: Signal not detected.

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Fig. 1. Early signal detection algorithm. The blue triangle on the left...
Fig. 4. Overview of mitigation levels, threats mitigated and the...
Fig. 6. Output of the detecting correlator. The orange curve:...
Fig. 7. Waterfall plot of the magnitude of the correlation function. 11...
+7 Fig. 8. Histogram -Signal detection for the nominal scenario under...
Implementation Considerations for ACAS and Simulation Results
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  • Jul 2023
The Assisted Commercial Authentication Service (ACAS) is a semi-assisted signal authentication concept currently being defined for Galileo, based on the E6-C encrypted signal. Leveraging the assumption that the true E6-C encrypted signal always arrives before any inauthentic signal, we define user concepts for signal detection, including vestigial...
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... number of correlators was set to 11 with a correlator spacing of 15 m, about a quarter of an E6-C BPSK(5) chip. Figure 6 shows the output of the correlator that was selected to detect the signal. The red dots indicate the status of the signal detection: 1: signal was detected, 0: signal was not detected. ...