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Communication Dans Un Congrès Année : 2002

Test-Bed for evaluation of impact of evil waveforms on real receivers and SQM performance


Several types of failures can occur in the GPS satellites that transmit the ranging signals to the users. Among them, a specific type of failure in the signal generation process aboard the satellite may result in an anomalous waveform being transmitted, called an ?evil waveform?. Evil waveforms are GPS signals that have a distorted PRN code modulation waveform. The main impact is a rupture of the symmetry of the crosscorrelation peak inside the tracking channel, therefore inducing a different measurement error for two receivers that would not have the same architecture. As a consequence, there is a potential for evil waveforms to induce large tracking errors of differential systems if left undetected. Simulations of the impact of these evil waveforms using simplified GPS receiver simulators with harmonized assumptions have been conducted by several teams. This includes simulations of the performance of the ground monitoring techniques (SQM) and tracking errors induced by these waveforms. In addition, several studies were carried out to analyze the behavior of real receivers tracking evil waveform signals among which is the reported study. Indeed, a joint M3S/ENAC team has developed for ESTEC a test-bed to increase the knowledge on the true effect of evil waveforms on real receivers. The test set-up enables to feed real receivers with GPS signals affected with any evil waveform in the threat model. The aim of the proposed paper is to report the measured impact of evil waveform on real receivers and to compare it with simulation results, as well as to present an assessment of the real performance of one Signal Quality Monitoring technique. The paper starts with a brief overview of the threat model and existing studies on the subject. Next, we present the test bed architecture that has been developed: overall architecture, baseband generation board, modulation, off-the-shelf receiver. Then, we present the observed correlation functions as well as the observed tracking error induced by evil waveforms and compare them with the predicted correlation shapes and tracking errors. Then, we present the observed SQM performance in presence of evil waveforms and compare it with its predicted performance. Finally, we present an assessment of the SQM false alarm performance on live signals.
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Dates et versions

hal-01021713 , version 1 (30-10-2014)


  • HAL Id : hal-01021713 , version 1


Christophe Macabiau, Willy Vigneau, Dominique Houzet. Test-Bed for evaluation of impact of evil waveforms on real receivers and SQM performance. ION GPS 2002, 15th International Technical Meeting of the Satellite Division of The Institute of Navigation, Sep 2002, Portland, United States. pp 1 - 11. ⟨hal-01021713⟩
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