FIG 2007Overview of Various GNSS NetworksNeal TosoProduct Marketing DirectorLeica Geosystems Inc.

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Agenda

Evolution of Reference Stations

Motivation for Reference Station Networks

Anatomy of a Reference Station Network

Importance of Standards

Reference Networks World Wide

CORS Stations in Latin America

Sample of Reference Networks in the USA

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Reference Station Evolution

Base StationTemporary

Owner use only

High Costs

Permanent RSFixed

Private Use

Proprietary

GNSS CORSStd. Coord Frame

Active Control

Standard RINEX

Network RTKWide Area RTK

Economical

Standard RTK

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Accuracy, Reliability, AvailabilityGood Bad

Single Baseline RTK Reference StationsRTK Accuracy

Horizontal:

10 mm + 1ppm

Vertical:

20 mm + 1ppm

30 km

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Accuracy, Reliability, AvailabilityGood Bad

Networked Reference Stations RTK Accuracy

Horizontal:

10 mm

Vertical:

20 mm

70 km

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Anatomy of a Reference Station Network

NetworkSoftware

CommunicationLinks

Monumentation

GNSSHardware

RTK DATA STANDARDS

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Importance of RTK Network Standards

RTCM V3.X Corrections for Network RTK

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Receiving Corrections for

Master and Correction

Differences for the Auxiliary

Correction Differencesof the Aux. relative to

the Master

RTCM 3.x Master Auxiliary Concept (MAC)One Master Reference Station, plus

Several Auxiliary Reference Stations Equals One Network Cell

Rover

Network Processing Facility

Network Estimation process including Ambiguity Resolution,

forming messages; transmission of Corrections for Master and of

Correction Differences for each Auxiliary.

Auxiliary Reference Station C

Auxiliary Reference Station D

Auxiliary Reference Station B

Master Reference Station A

Auxiliary Reference Station X

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RTK Network Data Compatibility

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GPS Reference Stations and Network Installations Leica Networks

California (12)

Hawaii (25)

Portugal (4)Taiwan

Mexico (34)

UK (25)

FloridaJapan (45)

Hong Kong Lands (42)Hong Kong Bridge (47)

New Zealand (20)

India (28)

France(12)

Colombia (8)

Australia (10)

Michigan (67)Michigan (67)

Sweden(46)

S.A. (80)

Georgia (11)

New York DOTAlabama DOTFlorida DOTOregon DOTIndiana DOTArizona HM

LVWVD

New York DOTAlabama DOTFlorida DOTOregon DOTIndiana DOTArizona HM

LVWVD

Texas (25)

Argentina 6

Louisiana

Belgium (57)

Canada (50)

Ireland

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CORS and Network Stations in Latin America

1Manfra/SaneparBrasil 1GeomatBrasil

1Usina Hidrelectrica de Itaipu, Divisa de engenheria Civil e Arquittetura

Brasil1FAPEGBrasil

2Universidade Estadual Paulista (UNESP) -Presidente Prudente

Brasil1CIW/UNIVAPBrasil

1Universidade De Sao Paulo, Escola Politecnica, Depto. De Eng. De Transportes

Brasil1CIW/São CarlosBrasil

1Manfra/UnisinosBrasil1CIW/Geraldo LinsBrasil

1Manfra/UnicempBrasil1CIW/EESCBrasil

1Manfra/ULBRABrasil1CIW/CoplanaBrasil

1Manfra/TeconBrasil1CIW/CopersucarBrasil

1Manfra/EAFABrasil1CIW/CEFETSBrasil

1Manfra/CesumarBrasil4Universidad Nacional de Cuyo, Facultad de Ingenieria, Instituto CEDIAC

Argentina

SitesWhoWhereSitesWhoWhere

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CORS and Network Stations in Latin America

2Instituto Geografico MilitarUruguay7Comision Nacional del Agua, Subgerencia de Información del Agua

Mexico

1Universidad de PiuraPeru1Comisio Federal de Electricidad, Complejo Hidroelectrico El Cajon

Mexico

1Quimica SuizaPeru3Centro de Investigación Científica y de Educación Superior de ensenada (CICESE), División Ciencias de la Tierra, Departamento de Sismología

Mexico

1PRODAPPPeru4Instituto de Investigacion: Observatorio Vulcanologico y Sismologico de Costa Rica. (OVSICORI)Universidad Nacional (UNA)

Costa Rica

1Municipio de Querétaro, Dirección Municipal de Catastro

Mexico4Instituto de Investigacion: Observatorio Vulcanologico y Sismologico de Costa Rica. (OVSICORI)Universidad Nacional (UNA)

Costa Rica

3Universidad Nacional Autonoma de Mexico - Instituto de Ingeniería -Coordinación de Estructuras y Materiales

Mexico1Acueducto de BogotaColombia

27Universidad Nacional Autonoma de Mexico - Instituto de Geofisica, Servicio Sismológico Nacional

Mexico11IGAC Instituto Geografico Agustin Codazzi)

Colombia

1Junta de Agua Potable y Alcantarillado de Yucatán (JAPAY), Dept. Siststemas de Información Geografica

Mexico1Sociedad Minera El AbraChile

SitesWhoWhereSitesWhoWhere

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Owner Operators GPS Networks

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Statewide

•http://www.myfloridagps.com/ http://www.mdotcors.org/

THUN THUN

PRDYPRDY

YELM YELM

CPXF CPXF

LNGBLNGB

Pierce County Cooperative CORS Network (PC3N)

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Loyola Spatial Systems

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Questions?