global navigation satellite system (gnss) update

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Impact of New SPS GNSS Receivers and Constellations on Precise Marine Positioning Martin de Kievit

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By Martin de Kievit (Sales Manager Marine at Trimble, The Netherlands) The demand for greater positioning accuracy with more reliability for waterways and marine positioning is aided with more satellite availability. While GPS from USA, and GLONASS from Russia, have been the mainstay of GNSS for the last few years we have seen three new constellations – QZSS from Japan, BeiDou (Compass) from China and GALILEO from Europe. This presentation reviews the current status of all the GNSS constellations. Other new developments which will be touched briefly; -Updated Geoid Model EGM-96, -Due to doubling of the number of satellites, the corrections needed for precise GNSS, have also doubled so a new correction format is explained. Furthermore we will tell you something about the latest RTX service (corrections over satellite) and xFILL technology (maintaining your positioning after you lose your GNSS signal).

TRANSCRIPT

Page 1: Global Navigation Satellite System (GNSS) update

Impact of New SPS GNSS Receivers and Constellations on

Precise Marine Positioning

Martin de Kievit

Page 2: Global Navigation Satellite System (GNSS) update

More Satellites are neededCongested marine spaces

Congested vessels

Demand for greater accuracy

Page 3: Global Navigation Satellite System (GNSS) update

GPS/GLONASS GPS

– 31 satellites active (Sept ‘13)

– L1 C/A & P(Y)

– L2 P(Y) & L2C (IIR-M)

– L5 (IIF) – First satellite launched May 2010 GLONASS

– 24 satellites healthy (Sept ‘13) as well as satellites in residual status

– L1 C/A & P

– L2 C/A (-M) & P

Page 4: Global Navigation Satellite System (GNSS) update

Multi-frequency/Multi-System Antenna- L1/L5/E6 Galileo Ready – shipping since 2005

Page 5: Global Navigation Satellite System (GNSS) update

Inside the GNSS receiver

Trimble 360°technology is used in SPS985 and SPS855 and BX 982 receivers

Dual Maxwell VI - 6th Generation Chip ASIC 2x 220 = 440 Channels GPS/GLONASS/Galileo/QZSS/Compass

compliant– For all current civilian open signals

Page 6: Global Navigation Satellite System (GNSS) update

GPS Modernization: L2C

First satellite launched September 2005– 8 Block IIR-M satellites so far– 1 Block IIF (adds L5)

Page 7: Global Navigation Satellite System (GNSS) update

L2C Signal Strength = Productivity

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GPS Modernization: L5 New 3rd frequency band GPS Block IIF satellites

– Block III will complete L5/L2C constellation

First launch occurred May 2010 Block IIF - also broadcast L2C signals SPS GNSS

– Capable of tracking L5 – Tested with the simulator and GPS IIF modulator– Successfully tracking L5

PRN 1 (IIR-M with L5) PRN 25 (IIF)

Page 9: Global Navigation Satellite System (GNSS) update

Trimble Simulation capability L1/L2/L5 GPS & E1/E5A/E5B Galileo

JPO L2-C / L5 Modulator

Tests

Page 10: Global Navigation Satellite System (GNSS) update

New GNSS Signals

Page 11: Global Navigation Satellite System (GNSS) update

Global ConstellationsGPS (31)

GLONASS (24) Galileo (22+)

Compass (~30)

Regional Constellations– QZSS (3)– IRNSS (7)

Satellite-Based Augmentations

WAAS (3) MSAS (2)

EGNOS (3) GAGAN (3)

SDCM

In the not too distant future…

Page 12: Global Navigation Satellite System (GNSS) update

SBAS systems

Page 13: Global Navigation Satellite System (GNSS) update

IRNSS and GAGAN Indian Regional Nav Satellite System

– Orbits similar to QZSS – inclined Geostationary orbit

– L5 & S-Band– 7 Satellites planned– First launched to be decided– No public ICD

GAGAN– Is a SBAS satellite over India– First satellite was launched in 2011, a second one

was launched in 2012– Full constellation of three satellites should be

ready end of 2014

Page 14: Global Navigation Satellite System (GNSS) update

GPS L1C / GPS III

L1C– Third GPS Civilian Signal

GPS III (2014 first launch)

– Also on QZSS ICD is public Modulation

– Very similar to Galileo– More multipath immunity c.f. C/A

Page 15: Global Navigation Satellite System (GNSS) update

QZSS

Quasi-Zenith Satellite System Eccentric Geo-synchronous Orbit L1 C/A, L1C, L2C, E6 & L5 First satellite launched September 2010 Augments GNSS in deep urban canyon Satellite appears at a high elevation for an extended

time period over Japan and Asia Pacific QZSS included in Trimble 360TM Technology

– SPS985 and SPS855 support this by default– Trimble Tracking L1 C/A, SAIF, L2C, L5– Also tracked L1C (first satellite to have L1C)

Page 16: Global Navigation Satellite System (GNSS) update

QZSS Orbit

Page 17: Global Navigation Satellite System (GNSS) update
Page 18: Global Navigation Satellite System (GNSS) update

QZSS Tracking Melbourne – November 2010 (CNo)

Page 19: Global Navigation Satellite System (GNSS) update

Beidou/Compass Beidou

– Geostationary active ranging system over China

Beidou-2 / Compass– MEO(Medium Earth Orbit / 16.000 km) ,

GEO (Geostationary Earth Orbit /36.000 km) and Inclined GEO

MEO satellite component system similar to GPS– First test satellite (MEO) launched early 2007

1 GEO failed in 2009 4 launches in 2010 (3 GEOs, 3 inclined GEO, 1 MEO)

– No public ICD – PRN Codes reverse engineered by Stanford University

Ephemeris/Clock etc format unknown– Codes will have similar performance to GPS

Although quality of the clocks, orbital modeling etc. are still unknown

Page 20: Global Navigation Satellite System (GNSS) update

Compass 10 active satellites in space

– 4x GEO – transmitting– 1x GEO – failed– 1x MEO – transmitting (oldest satellite from March

2007)– 5x Inclined GEO

3 Bands (B1, B2 & B3) Trimble 360TM Technology

– Inside SPS985 and SPS855– Tracking all 3 bands

Page 21: Global Navigation Satellite System (GNSS) update

Compass

No public ICD (Interface Control Document)– Tracking based on Stanford University work– No ephemeris/clock/almanac information (no ICD)– Able to produce code/carrier measurements but not position

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Compass Inclined Orbit Geo-Sync

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Compass Data

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Galileo European System

– 2 Test Satellites (don’t conform to the Galileo ICD) Giove-A Launched Dec 2005 Giove-B Launched April 2008

– 4 IOV satellites – started in October 2011 (2)– 22 further funded satellites to come

Original plan 27 – 30 satellites (only a subset funded)

Open Services– Require a license

Trimble IP supports Galileo and Trimble has a license to commercialize

Other Signals/Bands– E6 – commercial service (CS)– PRS – public regulated service– No public ICD for CS or PRS signals

Page 25: Global Navigation Satellite System (GNSS) update

Five Galileo Services Open access navigation

No charge, positioning down to 1 metre

Commercial navigation (encrypted) To the centimetre; service providers will charge

fees

Safety Of life navigation Open service for applications where guaranteed

precision is essential

Public regulated navigation (encrypted) Continuous availability even if other services are

disabled in time of crisis; Government agencies will be main users.

Search and rescue System will pick up distress beacon locations;

feasible to send feedback

Page 26: Global Navigation Satellite System (GNSS) update

GIOVE-A Pseudorange noise

Pseudorange measurement No code/carrier filtering E1 includes Everest Multipath mitigation

Page 27: Global Navigation Satellite System (GNSS) update

Summary – current constellation GPS

– 31 active GLONASS

– 24 active Compass

– 10 active Galileo

– 2 GIOVE test satellites, 2 IOV satellites QZSS

– 1 active SBAS

– WAAS (3) / EGNOS (3) / MSAS (2) / GAGAN (2) Current Total = 75+ GNSS satellites

– Plus additional in orbit non-transmitting spares (eg. GPS & GLONASS)

Page 28: Global Navigation Satellite System (GNSS) update

Too many satellites?

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CMRx Data format The Problem:

– Existing data formats too long when more satellites and more constellations are launched

– Need to reduce data volumes when using cell phone technology

– Licenses for wider band radios harder to obtain The Solution:

– Trimble’s CMRx proprietary format transmitted from Base Station

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Marine GNSS receivers

SPS985

SPS855 Base

SPS855 Rover

SPS855 & 555H Rover & Heading

sensor

Page 31: Global Navigation Satellite System (GNSS) update

SPS985 Smart Antenna Tracks GPS, GLONASS, QZSS, Compass, Galileo,

Marinestar, SBAS

Internal wideband 410-470 MHz or

licence free 900MHz

Battery door – ultra rugged. Removable

2.4 Ah battery

Bluetooth to Tablet or Computer

Scalable accuracy modes

‘Portable’ base or Rover

Wi-Fi for licence free radio and

access to Web UI

Quick Release adapter for one click on/off

pole

Page 32: Global Navigation Satellite System (GNSS) update

NEW BX 982 GNSS Modular Heading Receiver

Tracks GPS, GLONASS, QZSS, Compass, Galileo,

SBAS

Support for FDE and RAIM =

Positioning Integrity Monitoring

3x RS232, 1 x USB, 1x CAN , and 1 x

LAN Ethernet Port

Support for Marinestar

VBS,XP,G2 and HP

Rugged Housing

Configuration through our

standard web browser

2 x 220channel Trimble Maxwell

chip sets

Dual Antenna input

Page 33: Global Navigation Satellite System (GNSS) update

Fugro Marinestar now available on Trimble receivers

Receivers capable of receiving Marinestar VBS,XP,G2 and HP: – SPS461, SPS855, SPS985 and BX982 with

upgrade option Location RTK enabled Applications Marinestar:

– Navy & Defense applications (incl. Mine hunting)– Hydrographic surveys– Research Vessels– Bathymetry– Dredging– Positioning buoys & Jack-up rigs– And many others

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Marine

Wi-Fi on Smart Antenna (SPS985) Tracking structures – wirelessly License free Heading via Wi-Fi between SPS985’s

Updated Geoid Model EGM-96 More precise vertical – orthometric heights

related to sea level CMRx every 3 seconds – for slow radio links

for long range offshore

Page 35: Global Navigation Satellite System (GNSS) update

Questions?

[email protected]