Article Figures & Data
Figures
- FIGURE 1
Distribution of iGMAS and MGEX stations in support of BeiDou-3 dual-frequency signal tracking. The iGMAS and MGEX receivers are identified by square and circle dots in different colors.
- FIGURE 2
Weekly stability of BeiDou-2 satellite B1I-B3I DCBs generated by GTS-based and MGTS-based local ionospheric modeling methods
- FIGURE 3
Comparison of BeiDou satellite B1I-B3I DCB estimates from the iGMAS-only, MGEX-only, and iGMAS-plus-MGEX solutions; individual satellites are identified by their SVNs.
- FIGURE 4
Comparison of BeiDou-transmitted TGD1 parameters and post-processed B1I-B3I DCBs for January 2019; MGX and COM denote DCB estimates from the MGEX-only and MGEX-plus-iGMAS solutions, respectively.
- FIGURE 5
Monthly averages of BeiDou receiver B1I-B3I DCBs from the iGMAS-plus-MGEX solution
- FIGURE 6
Monthly STD of BeiDou receiver B1I-B3I DCBs at the individual station
- FIGURE 7
Receiver DCB differences generated from the independent BeiDou-2 and BeiDou-3 constellations; iGMAS and MGEX stations depicted on the horizontal axis are sorted by their geographic latitudes.
- FIGURE 8
BeiDou-3 B1Cp-B3I (circle) and B2ap-B3I (square) receiver DCBs in January 2019; different types of iGMAS receivers are depicted in different colors.
- FIGURE 9
Data-pilot biases of BeiDou-3 B1C and B2a signals; the color bars and dots correspond to the post-processed DCBs and transmitted ISCs, respectively.
Tables
- TABLE 1
Multi-GNSS receivers and BeiDou-3 capable pseudorange measurements within iGMAS and MGEX networks (as of January 2019).
Networks Manufactures Receiver types BeiDou-3 signals Sites B1C B1 B2a B3 iGMAS CETC-54 CETC-54-GMR-4016 C1P C2I C5P C6I 8 CETC-54-GMR-4011 N/A 3 CETC-20 GNSS_GGR N/A 7 Unicore UB4B0-13478 C1D C2I C5D C6I 6 MGEX Javad JAVAD TRE_3/3 DE/G3TH C1X C2I C5X C6I 30 (9) Leica LEICA GR10/25/30/50 N/A C2I N/A C6I 33 (0) Septentrio SEPT POLARX4/4TR/5/5TR N/A 57 (32) Trimble TRIMBLE NETR9/ALLOY N/A 70 (18) - TABLE 2
The day-to-day repeatability as well as weekly and monthly STDs of BeiDou satellite B1I-B3I DCBs from the iGMAS-only (IGM), MGEX-only (MGX), and iGMAS-plus-MGEX (COM) solutions
Constellation Day-to-day scatter (ns) Weekly STD (ns) Monthly STD (ns) IGM MGX COM IGM MGX COM IGM MGX COM BDS-2 GEO (5) 0.171 0.142 0.118 0.139 0.121 0.100 0.158 0.141 0.109 IGSO (7) 0.072 0.119 0.088 0.056 0.082 0.062 0.082 0.100 0.074 MEO (3) 0.156 0.164 0.158 0.128 0.150 0.138 0.137 0.154 0.131 BDS-3S IGSO (1) 0.101 0.158 0.087 0.062 0.131 0.066 0.074 0.132 0.065 BDS-3 MEO CAST (10) 0.188 0.169 0.143 0.158 0.138 0.102 0.168 0.170 0.117 MEO SECM (8) 0.174 0.167 0.133 0.150 0.142 0.104 0.153 0.153 0.109 - TABLE 3
Comparison of BeiDou-3 broadcast B1C/B2a-B3I TGDs and post-processed DCBs in January 2019 (unit: ns)
Satellite B1Cp-B3I B1Cd-B3I B2ap-B3I B2ad-B3I TGDB1Cp DCB DCB TGDB2ap DCB DCB CAST C201 (C19) 7.2 7.18±0.16 7.25±0.52 11.3 11.25±0.14 11.29±0.37 C202 (C20) 14.1 14.12±0.14 13.73±0.44 11.5 11.14±0.14 10.81±0.31 C205 (C22) 15.2 15.20±0.14 14.86±0.50 6.3 6.23±0.14 6.29±0.38 C206 (C21) 12.9 12.97±0.16 12.71±0.53 11.2 9.87±0.15 10.72±0.32 C209 (C23) 20.8 20.27±0.10 20.25±0.49 8.4 8.11±0.10 7.93±0.42 C210 (C24) 15.2 14.84±0.10 14.14±0.59 7.8 7.42±0.09 7.16±0.35 C213 (C32) -9.5 -9.80±0.19 -9.53±0.45 6.0 5.95±0.15 5.67±0.28 C214 (C33) –15.9 –15.77±0.16 –16.18±0.50 –37.7 –37.42±0.29 –38.42±0.36 C218 (C36) –21.2 –21.77±0.14 –22.05±0.48 6.7 6.27±0.10 5.70±0.40 C219 (C37) –13.9 –14.38±0.14 –14.39±0.48 3.4 2.55±0.14 1.64±0.35 SECM C203 (C27) –4.7 –4.38±0.11 –4.26±0.43 –4.2 –3.67±0.08 –3.25±0.28 C204 (C28) 0.0 0.29±0.15 0.47±0.46 –4.3 –3.90±0.11 –3.76±0.35 C207 (C29) 1.6 1.97±0.14 2.01±0.44 –4.7 –4.16±0.11 –3.63±0.32 C208 (C30) –10.1 –9.96±0.10 –9.46±0.42 –4.9 –4.64±0.09 –4.42±0.29 C211 (C26) –2.8 –2.16±0.10 –1.85±0.46 –4.7 –4.05±0.11 –3.80±0.32 C212 (C25) –0.5 –0.43±0.09 0.11±0.51 –4.6 –4.28±0.10 –4.16±0.46 C215 (C35) –3.3 –3.02±0.14 –3.22±0.50 –3.2 –2.95±0.10 –2.59±0.34 C216 (C34) –5.2 –5.16±0.16 –4.535±0.50 –4.1 –3.72±0.11 –3.81±0.34
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