GNSS SYSTEMS STATUS AND TECHNICAL UPDATES - Presented by: John Vint Survey Manager Fugro Survey AS The Hydrographic Society in Scotland, 27th ...
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GNSS SYSTEMS STATUS AND
TECHNICAL UPDATES
Presented by:
John Vint
Survey Manager
Fugro Survey AS
The Hydrographic Society in Scotland,
27th March 2013
www.fugro.no / www.starfix.com
Scope of Presentation
GNSS System Status.
Solar Activity.
Challenges of “The Arctic”.
Precise Remote Tracking.
Galileo Positioning.
www.fugro.no / www.starfix.com
Galileo, European Satellite Navigation System
Full Operational Capability
All services, 30 satellites
2020
Initial Operational Capability (IOC)
Early Services for Open Service
Demonstrator for Commercial Service
2014/2016
In-Orbit Validation (IOV)
4 fully operational satellites
Full Galileo Constellation
and ground segment
2011/2013
Galileo System Testbed
2 test satellites
2005/2008
www.fugro.no / www.starfix.com
Galileo Services Provision Time Line
www.fugro.no / www.starfix.com
Galileo Summary
October 2011 and October 2012 a total of four satellites
launched
– Navigation message transmitted on four IOV satellites
mid-March 2013, first Galileo only positioning
All industrial contracts necessary to ensure early Galileo
services have been signed (16 satellites)
To accelerate Galileo’s deployment the following contracts
were signed on 2 February 2012:
– Additional order for 8 satellites
– Adaptation of Ariane-5 for Galileo (launch of 4 satellites)
– Booking of one Ariane-5
www.fugro.no / www.starfix.com
BeiDou, Chinese Satellite Navigation System
• Regional Asia coverage 2013
– 4 MEO (Medium Earth Orbit)
– 5 GEO (Geostationary Orbit)
– 5 IGSO (Inclined Geostationary Orbit)
• Navigation message definition released
Dec 2012 (only Chinese companies had
access earlier)
• Full world wide Coverage 2020
• 30 MEO: 21500 km, 55 deg inclination
• 5 GEO: 35786 km
www.fugro.no / www.starfix.com
http://www.oosa.unvienna.org/oosa/en/SAP/gnss/icg/icg06/sixth-icg-meeting_-online-presentations.html
GPS/GLONASS
GPS
32 operational satellites
Launching GPS IIF satellites (with L5)
GPS III with new L1C from 2015
GLONASS
24 Operational satellites
GLONASS-K next generation with CDMA
(Code Division Multiple Access, all satellites
transmit on the same frequency, as
GPS/Galileo/Beidou)
www.fugro.no / www.starfix.com
Solar Activity
Auroral Oval
www.fugro.no / www.starfix.com
Solar Cycle 24
Solar Cycle 24:
Start: 2009
Maximum: 2013
http://solarscience.msfc.nasa.gov/images/ssn_predict_l.gif
www.fugro.no / www.starfix.com
Scintillation Frequency at Solar Maximum
100 days / year
10 days / year
http://online.qmags.com/GNSS0709/Default.aspx
www.fugro.no / www.starfix.comChallenges of “The Arctic”
www.fugro.no / www.starfix.comL-Band Delivery Satellite Footprints
www.fugro.no / www.starfix.comL-Band Coverage ESAT, AORE & IOR
IOR
Shtokman 73N,45E
AORE
ESAT
www.fugro.no / www.starfix.comL-Band Coverage ASAT & AORW
AORW
ASAT
www.fugro.no / www.starfix.comL-Band Coverage ASAT, PORL & AUSAT
AUSAT
PORL
ASAT
www.fugro.no / www.starfix.comImproved L-Band Delivery
Spot Satellite Delivery
Fugro Commissioned Alison
AD-492 and AD-493 Antennae
Customer Terminal
www.fugro.no / www.starfix.comIridium Summary
Using the Iridium low orbit satellite
communication system provides coverage
at high latitudes.
Iridium Open Port provides access to the
Internet, it is not a broadcast. Daily costs
apply.
Availability when accepting correction age
up to 2.5 minutes is above 98%
Average outage time is below 5 minutes.
Fugro have had 4 systems deployed during
the summer 2012 – West of Greenland.
www.fugro.no / www.starfix.comIridium System
• Iridium consists of 66 low orbit satellites,
with orbit height 780 km (100 min period).
• Satellite weight 680 kg
5-7 satellites launched with one booster
• Polar coverage.
• Launched 1997-1999
• “Iridium Next” satellites to be built by Thales
Alenia Space France.
• Launches 2015-2017
• 70 satellites in 10 launches
www.fugro.no / www.starfix.comIridium System
www.fugro.no / www.starfix.comIridium Data Transfer Process
Network Control
To / From
Iridium Satellites
NTRIP Caster Open Iridium
Perth / Oslo Internet Gateway
Offshore Installation
Connection to Open Internet is
established by onboard PC
Open Port PC Fugro
Terminal NTRIP Client Software
www.fugro.no / www.starfix.comStarfix.G2 Performance in Tromsø (70°N)
www.fugro.no / www.starfix.comStarfix.G2 Performance in Longyearbyen (78°N)
www.fugro.no / www.starfix.comCase Study – Atlantic Guardian
• Test Vessel
• Atlantic Guardian
• Operated by EMGS
(http://www.emgs.com)
• Electromagnetic Survey
www.fugro.no / www.starfix.comTest Equipment
•Test Equipment
• Kongsberg Seatex Seapath
(DGNSS and MRU Inertial System)
• Fugro G2 GPS/GLONASS
orbit/clock corrections received in 3610
demodulator.
Above Deck Equipment.
Possible L-Band Broadcast Antenna
(11 kg)
Open Internet
Connection
Iridium Below Deck Equipment. Seastar 3610. Kongsberg Seatex
Seapath.
www.fugro.no / www.starfix.comAvailability of Corrections
• Availability is shown when accepting a correction age of 2.5 minutes and
when accepting a correction age of 4.5 minutes.
• August data has higher availability, except for two days when two
incidents of 20-30 minute outage.
• A typical maximum age of corrections used offshore is 1 Minute. The reduced
accuracy due to this is marginal.
www.fugro.no / www.starfix.comAvailability of Corrections
• Availability is shown when accepting a correction age of 2.5 minutes and
when accepting a correction age of 4.5 minutes.
• A typical maximum age of corrections used offshore is 1 Minute. The
reduced accuracy due to higher age of corrections is marginal.
www.fugro.no / www.starfix.comOutage Times
• Maximum outage period in March was about 10 minutes
• In the August data the there was two outages in the 20-30 min range in 12 days.
• The mean outage period is below 10 minutes.
www.fugro.no / www.starfix.comOutage Times
• In the 12 day data set the there was two outages in the 20-30 min range
(one of them due to Ntrip Caster downtime in Perth Network Control Centre).
• The mean outage period is below 10 minutes.
The 13 Aug 27 min outage was due to Ntrip Caster downtime
www.fugro.no / www.starfix.comAtlantic Guardian 2012 in the Barents Sea
Data collected at about 73 deg North in the Barents Sea
Reported Standard Deviation Height (how accurate does the
system think the height is)
1.5 m
Relative
Height
-1.5 m
5.0 min
Age of 2.5 min
Correction
0.0 min
00:00 12:00 24:00
Time UTC
Age of Correction indicates how long ago since the last set of G2
corrections were received via Iridium
www.fugro.no / www.starfix.comStarfix.G2 Errors with “High Age of Corrections”
95% Horizontal during high age period: 11 cm
0.3 m
East error
-0.3 m
0.3 m
North error
-0.3 m
0.3 m
Height error
-0.3 m
5.0 min
Age of
2.5 min
Correction
0.0 min
12:00 13:00 14:00 15:00
Time UTC
www.fugro.no / www.starfix.comStarfix.G2 Errors without “High Age of Corrections”
95% Horizontal during high age period: 4 cm
0.3 m
East error
-0.3 m
0.3 m
North error
-0.3 m
0.3 m
Height error
-0.3 m
5.0 min
Age of
2.5 min
Correction
0.0 min
12:00 13:00 14:00 15:00
Time UTC
www.fugro.no / www.starfix.comSummary of Iridium Testing
Using the Iridium low orbit satellite
communication system provides coverage at
high latitudes.
Iridium Open Port provides access to the
Internet, it is not a broadcast service. Daily
costs apply. 2.5-3.5 MByte per day.
Availability when accepting correction age up to
2.5 minutes is typically 97-99%
Average outage time is below 5 minutes.
G2 via Iridium is an operational service
(being used on several vessels at high latitude)
www.fugro.no / www.starfix.comPrecise Remote Tracking
www.fugro.no / www.starfix.comAdvanced Gun Float and Tailbuoy Tracking
StarTrack
Remote
Unit
(SRU)
StarTrack Vessel Control Unit (VCU)
System Precision: RTK – 3 cm 1 Sigma
PPP – 10 cm 1 Sigma
www.fugro.no / www.starfix.com StarTrack Remote Unit (SRU):
One pod design.
Trimble GNSS Card
GPS (L1/L2/L2c) and GLONASS
(L1/L2).
Computations undertaken in Pod
Results and QC sent to vessel.
www.fugro.no / www.starfix.com RTK baseline calculations between vessel and pod:
– Accuracy 3 cm 1 Sigma.
PPP solution for each pod – Excellent QC:
– Accuracy 10 cm 1 Sigma.
Programming of Pods via wireless hand held terminal.
Mounting and installation compatible with Seatrack.
Fully ROHS / CE Compliant and NLR shock tested.
www.fugro.no / www.starfix.com StarTrack Vessel Control Unit (VCU):
2U 19” Rack Mounted.
Full StarPack Functionality.
Extended Functionality for StarTrack.
Place for up to 8 radio telemetry systems.
Communication between SRU and client software.
Supports all current RGNSS Outputs.
www.fugro.no / www.starfix.comwww.fugro.no / www.starfix.com
www.fugro.no / www.starfix.com
StarTrack FAT Results – 2 Hz Update
www.fugro.no / www.starfix.comStarTrack FAT Results – ½ Hz Update
www.fugro.no / www.starfix.comPrecise Remote Positioning – Other Uses
System designed for Seismic Gun and Tailbuoy
Tracking, but other uses are:
– General Remote Tracking.
– Dynamic Calibration.
– Relative Leg Penetration on Jack-up Rigs.
– Precise vessel draught measurements for use with
GNSS tides.
www.fugro.no / www.starfix.comReal-time PPP with Galileo is a “Reality”
Fugro have been working on a computing Galileo orbit
and clock corrections from our reference station network.
Navigation Message enabled on the 4 IOV satellites in
March 2013.
Within one week of activation, Fugro had an operational
Galileo PPP service.
Noise levels on Galileo solution is less than on the
combined GPS/GLONASS/Galileo solution.
See also http://gpsworld.com
www.fugro.no / www.starfix.comGalileo PPP System Performance
www.fugro.no / www.starfix.comThank you.
Questions ?
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