Precise positioning in multi-gnss mode
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1 Precise positioning in multi-gnss mode Novembre 2017
2 ±
3 Compatibilities between GNSS Lower L-Band Upper L-Band E5a+b E1 E5a E5b E6 L1 L5 B2 B2 L2 B3 B1 B1 Frequency (Mhz) GPS Galileo BeiDou BeiDou BeiDou III
4 Benefits of multi-gnss More satellites available Satellites visible anywhere anytime
5 Addition of GNSS rises the number of visible satellites 11.7 Mean number of visible satellites/day Galileo BeiDou GPS BeiDou + Galileo Galileo + GPS
6 Benefits of multi-gnss More satellites available Satellites visible anywhere anytime Improved satellite geometry
7 The geometry of the satellites affects the position precision : σ POS = DOP. σ OBS Position Dilution Of Precision
8 DOP values PDOP 7 TH BELGIUM GEOGRAPHY DAY Multi-GNSS solution improves geometry GPS Galileo BDS 0 GPS E1/L1 + GPS E5a/L5 + Galileo E5b/B2 + Galileo E1 Galileo E5a BeiDou B2
9 Benefits of multi-gnss More satellites available Satellites visible anywhere anytime Improved satellite geometry New frequencies available v
10 Best precisions with Galileo code signals New signals = more robust σ POS = DOP. σ OBS Metres L1 L2 L5 E1 E5a E5b E5a+b B1 B2 GPS Galileo BDS
11 Benefits of multi-gnss More satellites available Satellites visible anywhere anytime Improved satellite geometry New frequencies available Improved precision on position
12 Metres Precision on position (3D RMS) 7 TH BELGIUM GEOGRAPHY DAY Multi-GNSS solution leads to more precise positions regardless of the type of receiver used GPS Galileo BDS 0 GPS E1/L1 + GPS E5a/L5 + Galileo E5b/B2 + Galileo E1 Galileo E5a BeiDou B2
13 Benefits of multi-gnss More satellites available Satellites visible anywhere anytime Improved satellite geometry New frequencies available Improved precision on position Improved reliability
14 v 7 TH BELGIUM GEOGRAPHY DAY Galileo only (November 4 th ) v v
15 v 7 TH BELGIUM GEOGRAPHY DAY GPS + Galileo (November 4 th ) v v
16 Drawbacks of multi-gnss Differences between GNSS Coordinate systems Time systems Hardware delays additional biases negligible estimable constant Removed variable Additional unknown = Inter-System Biases (ISBs)
17 ISBs are receiver-dependent Mixed-receiver pairs University of Liège Mean: 1.52 m R9 R9 x5 xs x4 x4 Identical-receiver pairs Mean: 0.00 m Trimble Septentrio
18 ISBs are stable across years Mean: 2.85 m Mean: 2.83 m Mean: 2.85 m
19 ISBs might be affected by Receiver multipath filter for codes After After Firmware updates for phases Before Before
20 Conclusion Drawbacks of multi-gnss Coordinate systems Time systems Negligible Constant given in the ephemeris data Hardware delays Constant - Receiver and frequency dependent Benefits of multi-gnss Availability Position precision improvement Reliability
21 Precision on position PDOP 7 TH BELGIUM GEOGRAPHY DAY Multi-GNSS improves positioning results Multi-GNSS ISBs removed Metres 1 0 Obs GPS Galileo BDS Metres 1 0 E1/L1 E5a/L5 E5b/B2
22 Under the supervision of WARNANT René
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