Inside GNSS Media & Research

NOV-DEC 2018

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48 InsideGNSS N O V E M B E R / D E C E M B E R 2 0 1 8 www.insidegnss.com BLUEGNSS kind of analysis is carried out for every GNSS monitoring station within an observation period of one month and Tables 9 to 11 provide a set of typical outcomes. RF Interference Analysis In the framework of the BLUEGNSS project, E5/L5, L2, and E1/L1 frequencies are watched over by every BLUEGNSS monitoring sentinel in order to detect the presence of possible RF interfer- ence, which might degrade either GPS or Galileo performance. This task is accomplished by partitioning the spec- trum shown in Figure 22 into the follow- ing three frequency ranges, which are continuously monitored. • E5/L5 frequency range - Central fre- quency at 1185.00 MHz with a band- width of 50 MHz • L2 frequency. range - Central fre- quency at 1227.60 MHz with a band- width of 50 MHz • L1/E1 frequency. range - Central fre- quency at 1575.42 MHz with a band- width of 50 MHz By adopting a conservative approach, any interfering signal that crosses the interference mask (provided by either ICAO SAR Ps or t he ESA technica l report (J. Samson)) is considered poten- tially dangerous for the GNSS integrity FIGURE 21 Stanford diagram (from a BLUEGNSS monthly report) HPE (m) HPL (m) 0 5 10 15 20 25 30 35 40 45 50 55 60 60 55 50 45 40 35 30 25 20 15 10 5 0 Occurrences (%) 18 16 14 12 10 8 6 4 2 0 (a) APV-I horizontal Stanford diagram VPE (m) VPL (m) 0 5 10 15 20 25 30 35 40 45 50 55 60 60 55 50 45 40 35 30 25 20 15 10 5 0 Occurrences (%) 9 8 7 6 5 4 3 2 1 0 (b) APV-I vertical Stanford diagram HPE (m) HPL (m) 0 5 10 15 20 25 30 35 40 45 50 55 60 60 55 50 45 40 35 30 25 20 15 10 5 0 Occurrences (%) 18 16 14 12 10 8 6 4 2 0 (c) LPV-200 horizontal Stanford diagram VPE (m) VPL (m) 0 5 10 15 20 25 30 35 40 45 50 55 60 60 55 50 45 40 35 30 25 20 15 10 5 0 Occurrences (%) 9 8 7 6 5 4 3 2 1 0 (d) LPV-200 vertical Stanford diagram Station ID CR (%) Availability (%) Time (s) Continuity (%) LIML-MB01 0.0000 100.0000 2417557.0 100.0000 LGKO-TW01 0.0055 99.9758 2417066.0 99.9945 LMML-TW01 0.0364 99.9841 2414736.0 99.9636 LCLK-AS01 0.0448 99.8008 2412152.0 99.9552 Table11 LPV-200 vertical continuity of service (from a BLUEGNSS monthly report) Station ID CR (%) Availability (%) Time (s) Continuity (%) LIML-MB01 0.0000 100.0000 2417557.0 100.0000 LGKO-TW01 0.0018 99.9762 2417066.0 99.9982 LMML-TW01 0.0256 99.9952 2414736.0 99.9744 LCLK-AS01 0.0141 99.9351 2412152.0 99.9859 Table 10 APV-I vertical continuity of service (from a BLUEGNSS monthly report)

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