1. Status of the Japanese QZSS Program
Munich SatNav Summit
Munich, Germany
March 1-3, 2016
Status of
the Japanese QZSS Program
Takeyasu Sakai
Electronic Navigation Research Institute, Japan

2. Introduction QZSS (Quasi-Zenith Satellite System) Program:
Munich Summit 2016
Introduction
QZSS (Quasi-Zenith Satellite System) Program:
Regional navigation service broadcast from high-elevation angle by a combination of three or more satellites on the inclined geosynchronous (quasi-zenith) orbit.
The first satellite “Michibiki” launched in 2010 has been continuously broadcasting GPS-like ranging signals and some other signals.
Operational System is being implemented:
The Office of National Space Policy, Cabinet Office, now leads the program.
Begins the operation with 4-satellite configuration in April 2018, and 7-satellite configuration will follow by 2023.
The mission of the operational QZSS are defined as:
Positioning: Ranging and augmentation services including SBAS; and
Messaging: Short message service for disaster management.
Current Status:
Three space vehicles are in the factory to be launched in 2017.
The ground facilities are being implemented and will be ready by 2017.
Procurement of the following satellites are in progress for 7-satellite configuration.

3. QZSS Concept Broadcast signal from high elevation angle.
Munich Summit 2016
QZSS Concept
GEO
IGSOs
QZSS-IGSO
GPS/GEO
Broadcast signal from high elevation angle.
Applicable to navigation services for mountain area and urban canyon.
Augmentation signal from the zenith could help users to acquire and process other GNSS satellite signals at any time.
IGSOs centered at 135E.
Eccentricity 0.075, inclination 43deg.
Additional GEO.

4. Mission Mission 1: Positioning Services: Mission 2: Messaging Service:
Munich Summit 2016
Mission
Mission 1: Positioning Services:
Ranging Service:
Broadcasts GPS-like ranging signals on three frequencies (L1C/A, L2C, L5I/Q, and L1C) to improve availability of navigation in urban and mountain areas.
Submeter Level Augmentation Service:
Code-phase differential correction
service for mobile users.
Centimeter Level Augmentation Service:
Carrier-phase differential correction
service for precision applications.
Mission 2: Messaging Service:
Provides short message service for
disaster and crisis management.
Transmits messages on L1 frequency.
(C)JAXA
QZSS
Orbit and Ground Track

5. Contour of QZSS Minimum Elevation Angle
Munich Summit 2016
4-Satellite Config. in 2018
QZS Visibility Inside Japanese Territory
・ 2 or 3 IGSOs above 20 deg. elevation;
・ At least 1 IGSO above 60 deg. elevation.
Equator
・ Improved visibility
・ Additional services
Quasi-Zenith Orbit (IGSO)
Contour of QZSS Minimum Elevation Angle
Now we have the QZS-1 satellites on orbit.
Three additional satellites will be launched by 2017 (2 IGSO and 1 GEO).

6. Ranging Signals Signal Frequency MHz Service Compatibility QZS-1
Munich Summit 2016
Ranging Signals
Signal
Frequency
MHz
Service
Compatibility
QZS-1
QZS-2/4
QZS-3
IGSO
GEO
L1C/A
Positioning
Complement GPS 
L1C
L1S
Augmentation (SLAS)
QZSS Service
Message Service
　QZSS Service
L2C L5
L5S
Experimental Use
QZSS Service　 — L6
Augmentation (CLAS)
L1Sb
Augmentation
SBAS Service
L5S signal will be used for L5 SBAS experiment.

7. Organization Government of Japan
Munich Summit 2016
Organization
Government of Japan
QZSS Project
SBAS Project
Office of National Space Policy, Cabinet Office
Ministry of Land, Infrastructure, Transport and Tourism
Contract (PFI)
QZS System Service Inc. （QSS）
Civil Aviation Bureau of Japan(JCAB)
System and Service
Provider
Contract for satellites
Contract for Ground
System Procurement
SBAS Facility
NEC Corp.
（NEC）
Mitsubishi Electric Corp. （MELCO）
I/F of data and operational information
System Developers

8. Development/Launch (Additional 3 satellites)
Munich Summit 2016
Program Schedule
Fiscal Year
2015
2016
2017
2018
2019
2020
2021
2022
2023 and Later
1st Michibiki
QZSS
4-Satellite
Constellation
7-Satellite
Replenish Satellite
Launch #1-R
Experiment/Test
Service
Launch　#2,3,4
SBAS　Service
Development/Launch (Additional 3 satellites)
Service

9. QZS-1 Signal Quality SIS-URE of QZS-1 L1C/A is 0.4m RMS level
Munich Summit 2016
QZS-1 Signal Quality
SIS-URE of QZS-1 L1C/A is 0.4m RMS level
Comparable with those for GPS Block IIRM and IIF satellites
Specification on SIS-URE = 2.6m (95%)
10 m
For this month
of August 2015,
SIS-URE was just
0.34m RMS.
(Courtesy: (c) JAXA)
Since June, 2011, QZSS have provided navigation signals with good qualities, satisfying with their performance specifications, continuously.

10. (Civil Aviation Bureau)
Munich Summit 2016
SBAS Service in 2020
SBAS Facilities
QZSS Facilities
GPS Satellites
QZSS-GEO
　SBAS Signal
(１ PRN）
GPS Signal
Technical Management Center
Evaluation/Validation
Backup for Hitachiota
Uplink Stations
Monitor
Stations
Users
Master Control
Station (MCS)
Hitachiota Station
JCAB
(Civil Aviation Bureau)
CAO
(Cabinet Office)