An Industry View on Realistic Benefits for High Precision GNSS Applications due to GNSS Modernisation The Future of High Precision GNSS

Transcription

1 An Industry View on Realistic Benefits for High Precision GNSS Applications due to GNSS Modernisation The Future of High Precision GNSS Bernhard Richter GNSS Business Director at Leica Geosystems 1

2 Content A Look Back GNSS Modernization What can be expected in the near future? 2

3 Five Years Ago Trimble: Topcon: Leica Geosystems: [geoinformatics magazine] 3

4 There is Always a Boundary Line There exists a line between where GNSS RTK will work and where it will not work 4 The boundary line is created by difficult environments

5 Pushing Boundaries - Availability Leica Viva GPS GPS

6 Pushing Boundaries - Speed Leica Viva GPS GPS

7 Pushing Boundaries With each generation Leica pushes and will push the boundaries of performance Biggest performance increase was achieved because of the modernisation of GLONASS and the solution for GLONASS biases Average constellation is between 12 and 16 satellites smart selection and weighting of signals. Less can be more. Now with Leica Viva GNSS xrtk the boundary has been pushed further than ever to provide the user with more reliable RTK Fixed positions in more difficult environments 7

8 Content A Look Back GNSS Modernization What can be expected in the near future? 8

9 GNSS Modernization Overview Additional QZSS Japanese Quasi-Zenith Satellite System (3 satellites, L1, L2, L5, LEX, 2018+) IRNSS Indian Regional Navigation Satellite System (5-7 satellites, L5, S-band) 9

10 Challenges GNSS constellations from 6 different operators will need to be supported compatibility issues (reference frames, biases, clocks, orbits)? Extremely wideband jamming resistance? Lots of useful, but also lots of useless signals for high precision GNSS (Q, I+Q, E6B, E6(B+C), E6(A+B+C)). CPU and RTK link will be bottlenecks, not the channel count high CPU load for tracking and processing? Handling updates of system changes (leap seconds, new satellites, test satellites, spare satellites) Integrity? and this all at low costs, low power, high update rates and as small as possible 10

11 Which new GNSS needs 1st Consideration? 11

12 Which new GNSS needs 1st Consideration? COMPASS COMPASS currently has 13 satellites in orbit: 3 MEO B1/B2/B3 5 GEO (one drifting orbit) B1/B2/B3 5 IGSO B1/B2/B3 Modernisation 15 satellites by 2013 (5 GEO, 6 IGSO, 4 MEO) 35 satellites by 2020 Regional service available by 2013 Main Issues Test ICD published (but no Navigation information published). Full ICD promised for 2012 Satellite orbit drifting GEO satellite Interoperability issues 12

13 Roadmap Galileo More Talking than Implementing Currently has 4 satellites in orbit: 2 IOV satellites (E1/E5a/E5b/Alt-BOC/E6) 2 GIOVE test satellites Modernisation 14 Galileo + 4 IOV satellites in orbit by Galileo satellites in orbit by 2020 Additional commercial service available (TBD) GIOVE satellites to be phased out in 2012 Main Issues Aggressive launch plan Lots of funding and political discussions Highest ratio: google searches galileo.ppt # of satellites [Frank van Diggelen] 13

14 Content A Look Back GNSS Modernization What can be expected in the near future? 14

15 Benefits due to GNSS Modernisation Multiple frequencies and multiple systems: Improved ambiguity search techniques instantaneous, more reliable, larger baselines Better error modelling higher reliability (6 Sigma reliability will be possible) Only slightly better accuracy Only slightly stronger, better signals Improved tracking capabilities under foliage areas L5 frequency in ARNS band more secure for jamming GLONASS inter-frequency biases will vanish if CDMA is used Better code multipath (Galileo), QZSS and IRNSS might offer additional data services 15

16 Advances in RTK any Breakthroughs? Why are RTK corrections needed? To get to cm level accuracy What is needed to provide the corrections? A single reference station or a reference network What are the current limitations? Poor communication (to receive the correction) Sometimes poor cellular networks, short UHF radio range Geostationary satellites are often obstructed Why not getting the RTK corrections directly from the Navigation System? GPS is not designed to stream RTK corrections With the current concept (RTCM3) large bandwidth would be needed to cover large area..but where ever there is a strong need, technology will find a solution 16

17 RTK without Communication Devices PPP-RTK PPP-RTK is a promising technology to provide cm accuracy, just like RTK PPP-RTK only needs limited bandwidth (<2 400bps e.g. for whole of Japan) High rate orbital, clock and atmospheric corrections and satellite bias models Same density of reference stations needed as for RTK networks First services currently available through TCP/IP (and L-band) 17

18 A Vision for Galileo A missed Chance cm positioning without any additional communication device Galileo or other GNSS data signals could provide corrections No cellular networks needed No Geostationary satellite needed no signal blockage One receiver front end, the GNSS card and communication at a size of half a credit card High precision GNSS at the size of an iphone Realistic: in 2020 yes, but Galileo might have missed a chance due to bandwidth limits

19 Leica Viva GNSS Future Proof Whatever happens on the space segment...we will push the boundaries further!...let us inspire you! * Leica Viva GNSS fully capable of GPS, GLONASS (CDMA), Galileo, Compass, QZSS, IRNSS 19