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Nadarajah, N.; Khodabandeh, A.; Wang, K.; Choudhury, M.; Teunissen, P. Multi-GNSS PPP-RTK: From Large- to Small-Scale Networks. Sensors 2018, 18, 1078. [ Google Scholar] [ CrossRef][ Green Version] Altamimi Z, Rebischung P, Metivier L, Xavier C (2016) ITRF2014: a new release of the international terrestrial reference frame modeling nonlinear station motions. J Geophys Res Solid Earth 121:6109–6131. https://doi.org/10.1002/2016JB013098

Wang, W.; Chen, T.; Ding, R.; Seco-Granados, G.; You, L.; Gao, X. Location-based timing advance estimation for 5G integrated LEO satellite communications. IEEE Trans. Veh. Technol. 2021, 70, 6002–6017. [ Google Scholar] [ CrossRef] Wang, C. Solar Radiation Pressure Modelling for BeiDou Navigation Satellites. Ph.D. Dissertation, GNSS Research Center, Wuhan University, Wuhan, China, 2019. [ Google Scholar]The efficiency of the orbit solutions is evaluated as a ratio between the number of successful SLR solutions to the number of determined orbit solutions using microwave observations at CODE for the same period. Arnold D, Meindl M, Beutler G, Dach R, Schaer S, Lutz S, Prange L, Sośnica K, Mervart L, Jäggi A (2015) CODEs new solar radiation pressure model for GNSS orbit determination. J Geod 89(8):775–791. https://doi.org/10.1007/s00190-015-0814-4 Arnold D, Meindl M, Beutler G, Dach R, Schaer S, Lutz S, Prange L, Sośnica K, Mervart L, Jäggi A (2015) CODE’s new solar radiation pressure model for GNSS orbit determination. J Geod 89(8):775–791. https://doi.org/10.1007/s00190-015-0814-4 Sośnica K, Thaller D, Dach R, Steigenberger P, Beutler G, Arnold D, Jäggi A (2015b) Satellite laser ranging to GPS and GLONASS. J Geod 89(7):725–743. https://doi.org/10.1007/s00190-015-0810-8

The shield created by this skill lasts for a short duration even after the skill button is released, allowing the skill's DMG to trigger the effects of Geo Resonance. A GNSS software-defined receiver consists of three major components: RF front-end unit, a signal processing unit, and a navigation processing unit. The RF front-end module is responsible for signal amplification, noise filtering, down-conversion, automatic gain control, and analogue-to-digital conversion. The front-end module converts the received analog data to digital Intermediate Frequency (IF) data at a rate which is several times more than the code chipping rate. A 26 MHz sampling frequency is used to generate the raw digitized IF samples in all the experimented cases of this work. Yan, X.; Liu, C.; Huang, G.; Zhang, Q.; Wang, L.; Qin, Z.; Xie, S. A priori solar radiation pressure model for BeiDou-3 MEO satellites. Remote Sens. 2019, 11, 1605. [ Google Scholar] [ CrossRef][ Green Version] The strategy of the orbit solution is similar to the official 5-system CODE solution for MGEX (Prange et al. 2017), i.e., 3-day orbital arcs are generated, and the solution for a particular day refers to the middle day of the arc. Such an approach greatly stabilizes the solution, especially for new and incomplete GNSS systems, and thus is used not only for MGEX solutions, but also for operational and reprocessed products at CODE (Lutz et al. 2016). Geng, J.; Teferle, F.N.; Shi, C.; Meng, X.; Dodson, A.H.; Liu, J. Ambiguity resolution in precise point positioning with hourly data. GPS Solut. 2009, 13, 263–270. [ Google Scholar] [ CrossRef][ Green Version]An estimate of the noise power μ N is obtained first by correlating the incoming signal with the locally generated PRN (Pseudo Random Noise) code with a correlator which is +2 chips early from the prompt correlation index. Hugentobler U (2016) Ranging the GNSS constellation. In: 20th international workshop on laser ranging held in Potsdam, Germany, 10–14.10.2016 Niell AE (1996) Global mapping functions for the atmosphere delay at radio wavelengths. J Geophys Res 101(B2):3227–3246. https://doi.org/10.1029/95JB03048 Pearlman M, Degnan J, Bosworth J (2002) The international laser ranging service. Adv Space Res 30(2):135–143. https://doi.org/10.1016/S0273-1177(02)00277-6 The skill description is somewhat misleading. The Press skill has the same functionality as the Hold skill (including the shield and energy storing), but only during a very brief window.

As the data-bit set length is 2 X bit, there will be altogether 2 X bit chunks of correlation matrices with all possible code delay and carrier Doppler combinations for a specific BeiDou GEO satellite. The winning index is the one which has the maximum correlation peak, and therefore, it can then be used for detecting the presence of the satellite, along with the estimation of the carrier Doppler and the code phase via a pre-detection threshold computed against a certain probability of false alarm. Bruyninx C, Habrich H, Söhne W, Kenyeres A, Stangl G, Völksen C (2012) Enhancement of the EUREF permanent network services and products. IAG Symp Ser 136:27–35. https://doi.org/10.1007/978-3-642-20338-1_4 Sibthorpe A, Bar-Sever Y, Bertiger W, Lu W, Meyer R, Miller M, Romans L (2016) BeiDou orbit determination processes and products in JPL’s GDGPS system. In: Proceedings of IGS Workshop 2016, Feb 8–12, Sydney, Australia IGS RINEX WG, RTCM-SC104 (2013) RINEX—the Receiver Independent EXchange format, Version 3.02. ftp://igs.org/pub/data/format/rinex302.pdf. Accessed 7 Feb 2019 Hugentobler U (2017) Innovation: laser ranging to GNSS satellites. In: GPS world, vol 28, no 5, 42 pp, May 2017. http://gpsworld.com/kindred-spirits-laser-ranging-to-gnss-satellites/Zajdel R, Sośnica K, Bury G (2017) A new online service for the validation of multi-GNSS orbits using SLR. Remote Sens 9:1049. https://doi.org/10.3390/rs9101049