GPS Augmentation Services in Japan

for the 8th IISC Europe at PragueDecember 2 - 3, 1999

by IISC CPoC in Japan

Hiroshi Nishiguchi

Japan GPS Council

Current Augmentation Systems in Japan

MSAS : MTSAT Satellite-based Augmentation System(under Construction by JCAB)

Beacon DGPS : Maritime Safety Agency(FOC : April, 99 with 27 Ref. St. )

FM-DGPS : Nation-wide Service by Gpex and Japan FM Network using FM sub-carrier without direct charge (FOC : May, 97 with 7 Ref. St.)

RTK-OTH : Marine Constructions, off-shore Remote Constructions, in-land

Status of the Car Navigation Markets

2005 2003 2000 1999 1998 1997 1996 1995 1994 19931,000sets 2600 2200 1800 1500 1300 1050 850 550 330 140

Ratio ofprevious 118.2 122.2 120.0 115.4 123.8 123.5 154.5 166.7 235.7

<DGPS><485> <240> - - -

Actual shipment results

Source : JGPSC

•FM-DGPS service has been provided since May,1997.•EIAJ figure + non EIAJ

GNSS Performance• Accuracy

– Difference between measured position and true position

• Integrity– The ability of system to provide timely warnings to users when the syst

em should not be used for navigation

• Continuity– The capability to perform its function without non-scheduled interruptio

ns during the intended operation

• Availability– The portion of time during which the system is to be used for navigati

on

• Space reference– World Geodetic Systems, 1984 (WGS-84)

– APL(Airport Pseudolite)

Ground Components

•Master Control Stations (MCS) CPF Central Processing Facility NES Navigation Earth Station M&C Monitor & Control•Ground Monitor Stations (GMS)•Monitoring & Ranging Stations (MRS)•Network Communication System (NCS)

System Architecture

Ibaraki MCSIbaraki MCS

Sapporo GMSSapporo GMS

Fukuoka GMS

Naha GMSNaha GMS

UserUser

Australia MRSAustralia MRS

Hawaii MRSHawaii MRS

Kobe MCSKobe MCS

Tokyo Tokyo GMSGMS

GPS ConstellationGPS ConstellationMTSATMTSAT

MCS Master Control StationMCS Master Control Station

MRS Monitor and Ranging StationMRS Monitor and Ranging Station

GMS Ground Monitor StationGMS Ground Monitor Station

KDD 128KbsKDD 128Kbs

NTT 64KbsNTT 64Kbs

SBAS Service Providers

• WAAS (USA)– phase 1 operation in 1999

• CWAAS (Canada)

• EGNOS (Europe)– planned for 1999

• MSAS (Japan)– phase 1 operation in 2001

Interoperability among SBASs

• Receiver/Signal in Space– All SBASs to refer RTCA Do-229 MOPS

• Network– Information exchange between SBASs

• On-going Discussion in IWG– Interoperability Working Group among SB

AS Service Providers

Configuration of GBAS

– Ground Segment Architecture • GNSS Receivers

• Data Processor

• NABS Transmitter

• Monitor

• Pseudolite (Option)

GPS

GLONASSMTSAT

GNSS, SBAS &GBAS Receivers

GBAS Monitorstation

PseudoliteGNSSReceivers

GNSS

Data Processor

SBAS

GBAS NABS Transmitter