Inside GNSS Media & Research

JUL-AUG 2018

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www.insidegnss.com J U L Y / A U G U S T 2 0 1 8 Inside GNSS 55 nique to aid the overall position solution of a receiver when in the presence of RFI or spoofing attacks. We also present a detailed description of the process of sig- nal addition to the GNSS-SDR platform and serves as a template for developers with the intention of contributing to the platform. Acknowledgments is material is based upon work par- tially supported by the National Science Foundation Graduate Research Fellow- ship under Grant No. DGE 1144083 and the Google Summer of Code (GSoC) 2017 program. Special thanks to the GNSS-SDR team mentors during the GSoC 2017 program including Luis FIGURE 7 GNAV Navigation Message Structure FIGURE 8 GLONASS L1 C/A position solution using the GNSS-SDR software receiver GPST (s) 6.0442 6.0446 6.045 6.0454 6.0458 ECEF X (m) ×10 5 –1.28805 –1.2881 –1.28815 –1.2882 –1.28825 ×10 6 ECEF Y (m) –4.72076 –4.72077 –4.72078 –4.72079 –4.72080 –4.72081 ×10 6 GPST (s) 6.0442 6.0446 6.045 6.0454 6.0458 ECEF Y (m) ×10 5 –4.7205 –4.7206 –4.7207 –4.7208 –4.7209 –4.721 ×10 6 GPST (s) 6.0442 6.0446 6.045 6.0454 6.0458 ECEF Z (m) ×10 5 4.0799 4.0798 4.0797 4.0796 4.0795 ×10 6 ECEF X (m) –1.2882 North (m) 10 5 0 –5 –10 East (m) –15 –10 –5 0 5 10 15 20 –1.28818 –1.28816 –1.28814 –1.28812 ×10 6 GPST (s) 6.0442 6.0446 6.045 6.0454 6.0458 dt (m) ×10 5 1 0 –1 –2 –3 –4 Num Obs 14 12 10 8 6 4 ×10 -21

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