Test of GNSS Receiver Behavior in Presence of Multiple Correlation Peaks Induced by Evil Waveform

Ikhlas Selmi, Paul Thevenon, Christophe Macabiau, Jaron Samson

Abstract: Evil Waveforms (EWF) are non-nominal distortions that can be observed on satellite signals and cause additional bias on the estimated user position. A Threat Model (TM) has been proposed by ICAO for GPS L1 C/A to describe the possible distortions that can be observed on the GPS signals. This Threat model is also adopted for Galileo E1-C and E5a-Q signals. To evaluate the induced tracking bias by the EWFs of the ICAO TM, the receiver behavior after their occurrence needs to be assessed. In addition, some EWF cases induces multiple peaks on the correlation function. The main question of this study is: how the receiver deals with the multiple peaks situation and what impact it can have on the induced EWF bias. The present paper evaluates the effect of two Receiver Behavior Models (RBM) based on two possible reactions of the DLL after EWF occurrence: loss and no loss of the tracking. Those RBMs are modelled using different parameters such as the DLL pull in area and the C/N0 loss. The study shows the occurrence of multiple zero crossing situations and the EWF induced bias for both RBMs. The sensitivity of these results to the EWF Threat Space and tested User Space is then analyzed for both RBMs. This paper presents the results obtained when testing TM-A, B and C on Galileo E5a signal. Then, it discusses the observed impacts of the two tested RBMs and the situation of multiple zero crossing on the EWF induced tracking bias.
Published in: Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021)
September 20 - 24, 2021
Union Station Hotel
St. Louis, Missouri
Pages: 4183 - 4197
Cite this article: Selmi, Ikhlas, Thevenon, Paul, Macabiau, Christophe, Samson, Jaron, "Test of GNSS Receiver Behavior in Presence of Multiple Correlation Peaks Induced by Evil Waveform," Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021), St. Louis, Missouri, September 2021, pp. 4183-4197.
https://doi.org/10.33012/2021.18088
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