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Communication Dans Un Congrès Année : 2020

Test of the filter design effect on Evil Waveform monitoring in SBAS for Galileo E1 and E5a signals

Ikhlas Selmi
Paul Thevenon
Olivier Julien
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Mikaël Mabilleau
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Résumé

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 [1]. This Threat model is also adopted for Galileo E1-C and E5a-Q signals. A previous paper focused on the Signal Quality Monitoring (SQM) design and compliance test for Galileo signals. In the present paper, the effect of the pre-correlation filter design applied at the aircraft and reference station receivers on the EWF induced bias and SQM compliance test is assessed. Two aspects of the filter design are considered: the filter center frequency shift due to temperature variation or electronic component aging, and the filter gain roll-off out of the filter bandwidth. The obtained results of EWF differential biases and SQM test in [2] are considered as the baseline results used to evaluate the effect on the tested filter parameters. This paper concludes on the tolerable center frequency offset and gain roll-off based on the comparison of the obtained EWF results for Galileo E1 and E5a to the baseline one.
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Dates et versions

hal-02961129 , version 1 (08-10-2020)

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Ikhlas Selmi, Paul Thevenon, Christophe Macabiau, Olivier Julien, Mikaël Mabilleau, et al.. Test of the filter design effect on Evil Waveform monitoring in SBAS for Galileo E1 and E5a signals. ION GNSS+ 2020, 33rd International Technical Meeting of the Satellite Division of the Institute of Navigation, Sep 2020, Virtual event, United States. pp 2398 - 2415, ⟨10.33012/2020.17657⟩. ⟨hal-02961129⟩
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