Inside GNSS Media & Research

JUL-AUG 2019

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26 Inside GNSS J U L Y / A U G U S T 2 0 1 9 also observe that the minimum steering error in SF is provided by Galileo in E1 ("GAL C1"), which can be explained by the superior performance of the NeQuick iono model as compared to Klobuchar. However the good SF results in L1/E1 must be taken with caution, since this is the signal most likely to be jammed. Interestingly, the E6 signal, unique to Galileo, is the one providing the second- best SF steering, a er L1/E1. e worst SF steering is obtained using pseudoranges in the L5/E5 bands, with daily errors of the order of 0.3 ns/day. Very similar facts are observed from an analogous CV processing of the PHM-B clock. In conclusion, in the worst scenario we would be able to steer distributed in Europe by T4Science, Switzerland. The GNSS receivers are PolaRx5TR from Septentrio, Belgium. e frequency steppers are HROG-10 from SpectraDynamics, Colorado, USA. At PTB, GNSS data used in this experi- ment has been collected by a GTR55 receiver from MESIT, Czech Republic. White Rabbit equipment and support is provided by Seven Solutions from Granada, Spain. WANTime is a registered trademark of GMV. Authors Ricardo Píriz is an aeronau- tical engineer by the Poly- technic University of Madrid. He s tar te d his care er as a Flight Dynamics engineer in the Precise Orbit Determina- tion group at ESOC, the Euro- pean Space Operations Cen- ter in Darmstadt, Germany. Later on he moved to Eutelsat in Paris, as a Mission Analysis engineer in the Satellite Procurement Division. Since 2001 he has been in the GNSS Business Unit of GMV working in several projects, in particular in the GIOVE Mission (the experimental phase of Gali- leo), and in the Galileo Time Validation Facility (TVF). He is currently Leader of the GNSS Time & Frequency Group. Pedro Roldán has a Master of Science in Aerospace Engi- neering from the Technical University of Madrid and in Meteorology and Geophysics from the Complutense Uni- ver sit y of Ma drid. H e has worked at GMV since 2013, focused on the defi nition and development of GNSS and timing algorithms, including algorithms for precise orbit determination, precise point posi- tioning, time transfer, steering of clocks and defi - nition and maintenance of time scales. Esteban Garbin is an Elec- tronics and Telecommunica- tion engineer who got his Ph . D. f ro m Po li te cni co di Torino in 2017. His research studies focused mainly on GNSS receivers and signal processing algorithms, par- ticularly for interference and spoofi ng detection and mitigation. Since June 2017 he has been working for GMV, focusing on diff erent aspects in the GNSS Advanced User Segment solutions divi- sion, mainly developing novel concepts on GNSS timing and receivers. the clock to UTC using SF CV in any single GNSS band, with a maximum deviation of 0.3 ns/day, equivalent to 9 ns in one month. is possibility would be very useful in case of persistent jamming or interference in any other band(s), in particular in L1/E1. So far SF steering has not been necessary in WANTime, and the nominal GPS P1/ P2 combination has been used since the start of the service provision at the beginning of April 2019. Our devia- tion from UTC(PTB) so far is shown in (Figure 4). Manufacturers At GMV, the PHMs used in this project are model 1008 from Vremya, Russia, PRECISION TIMING FIGURE 3 The numerical values of the adjusted models. FIGURE 4 Deviation of WANTime from UTC(PTB).

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