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Japanese QZSS satellite orbit visualisation
Japanese QZSS satellite orbit visualisation
Published: 2014/07/09
Channel: Li Qiao
Quasi-Zenith Satellite System
Quasi-Zenith Satellite System
Published: 2010/01/25
Channel: Kowch737
Michibiki - a new Japanese GPS satellite launched
Michibiki - a new Japanese GPS satellite launched
Published: 2017/10/13
Channel: Pin Swede
6.6 - QZSS
6.6 - QZSS
Published: 2016/12/22
Channel: LaintalAy
Japan
Japan's H-IIA Launches third Quasi-Zenith Satellite
Published: 2017/08/19
Channel: Spaceflight101
Japan
Japan's H-IIA blasts off with 2nd Quasi-Zenith Satellite
Published: 2017/06/01
Channel: Spaceflight101
Scrub - Japanese H-2A Launching Michibiki 3 Quasi-Zenith Navigation Satellite - Live Mirror
Scrub - Japanese H-2A Launching Michibiki 3 Quasi-Zenith Navigation Satellite - Live Mirror
Published: 2017/08/12
Channel: Julian Danzer
Satellite navigation-GPS|NAVIC|BeiDou|Gelileo|GLONASS|QZSS|DORIS|Top Satellite  navigation
Satellite navigation-GPS|NAVIC|BeiDou|Gelileo|GLONASS|QZSS|DORIS|Top Satellite navigation
Published: 2017/04/05
Channel: TRENDING RAINBOW
Japan puts fourth GPS satellite in orbit: what helps guide autonomous vehicles
Japan puts fourth GPS satellite in orbit: what helps guide autonomous vehicles
Published: 2017/10/10
Channel: Aban Tech
GPS/QZSS Satellite Orbit (Time Lapse Video by EX-ZR500)
GPS/QZSS Satellite Orbit (Time Lapse Video by EX-ZR500)
Published: 2014/07/05
Channel: 2e26tenW
Japanese H-2A Launching Michibiki 3 Quasi-Zenith Navigation Satellite - Live Mirror And Discussion
Japanese H-2A Launching Michibiki 3 Quasi-Zenith Navigation Satellite - Live Mirror And Discussion
Published: 2017/08/20
Channel: Julian Danzer
Bryton Rider 410│How To Change GPS System
Bryton Rider 410│How To Change GPS System
Published: 2018/07/12
Channel: Bryton
H-IIA Rocket Launches Michibiki-4 Satellite (QZSS-4 /  準天頂衛星「みちびき4号機」)
H-IIA Rocket Launches Michibiki-4 Satellite (QZSS-4 / 準天頂衛星「みちびき4号機」)
Published: 2017/10/10
Channel: Go To Space
MGA Webinar W01
MGA Webinar W01
Published: 2018/06/03
Channel: MobileMap
Japan lanched it
Japan lanched it's own GPS satellite || Michibiki Satellite
Published: 2017/06/01
Channel: Niazi Studio
Japan launches rocket with new
Japan launches rocket with new 'Michibiki' GPS for security purposes
Published: 2017/06/01
Channel: RT
GPS/QZSS Spoofing Demo
GPS/QZSS Spoofing Demo
Published: 2015/01/28
Channel: MobileMap
Mitsubishi electric begins autonomous driving test using quasi-zenith satellite system
Mitsubishi electric begins autonomous driving test using quasi-zenith satellite system
Published: 2017/11/10
Channel: Nguyen Thi Tuyet (Trung hoc co so Hai Lang)
GPS, GLONASS, Galileo, BeiDou and QZSS  RF front end for software receivers.
GPS, GLONASS, Galileo, BeiDou and QZSS RF front end for software receivers.
Published: 2013/05/20
Channel: DigitalGNSS
Satellites in Orbit The Earth
Satellites in Orbit The Earth
Published: 2018/01/04
Channel: chu văn thành
Launch of H-IIA/F18 with QZSS Satellite "MICHIBIKI"
Launch of H-IIA/F18 with QZSS Satellite "MICHIBIKI"
Published: 2010/09/12
Channel: gleamdf
Spoof Detection
Spoof Detection
Published: 2014/12/26
Channel: MobileMap
ARCHIVE: Launch of Japanese H-IIA Rocket with QZS-4
ARCHIVE: Launch of Japanese H-IIA Rocket with QZS-4
Published: 2017/10/09
Channel: Space Videos
JAXA H-IIA Launched Michibiki 3 Communication Satellite
JAXA H-IIA Launched Michibiki 3 Communication Satellite
Published: 2017/08/19
Channel: SPACE and ISRO news
QZSS Demo - IGNSS 2013 Conference
QZSS Demo - IGNSS 2013 Conference
Published: 2013/08/02
Channel: tomssy
JAXA H-IIA F36 Rocket launches QZS-4 Satellite (Michibiki 4/準天頂衛星 みちびき4号機)
JAXA H-IIA F36 Rocket launches QZS-4 Satellite (Michibiki 4/準天頂衛星 みちびき4号機)
Published: 2017/10/09
Channel: SPACE and ISRO news
GNSS Introduction (Bangla - বাংলা)
GNSS Introduction (Bangla - বাংলা)
Published: 2017/08/04
Channel: Md. Hossan
Rocket Launch of QZS-4 on Japanese H-IIA Rocket
Rocket Launch of QZS-4 on Japanese H-IIA Rocket
Published: 2017/10/09
Channel: Space Videos
Successful launch for Michibiki satellite
Successful launch for Michibiki satellite
Published: 2017/10/19
Channel: Nikkei Asian Review
H-IIA 204 | Michibiki 3 (QZS-3)
H-IIA 204 | Michibiki 3 (QZS-3)
Published: 2017/08/28
Channel: Rocket Watch
H-IIA F35 launches QZS-3 (Michibiki 3/みちびき3号機)
H-IIA F35 launches QZS-3 (Michibiki 3/みちびき3号機)
Published: 2017/08/19
Channel: SciNews
"North Korea" Japan monitors Kim Jong-un for 24 hours. "South China Sea"
"North Korea" Japan monitors Kim Jong-un for 24 hours. "South China Sea"
Published: 2017/06/01
Channel: kougun2007
MGA Webinar W02
MGA Webinar W02
Published: 2018/06/03
Channel: MobileMap
Know all about navigation - The world of GNSS
Know all about navigation - The world of GNSS
Published: 2016/09/15
Channel: Geospatial World
National Precise Positioning
National Precise Positioning
Published: 2015/03/13
Channel: CRC for Spatial Information
H-IIA Rocket Blasts off with final Member of Navigation Constellation
H-IIA Rocket Blasts off with final Member of Navigation Constellation
Published: 2017/10/10
Channel: Spaceflight101
Mitsubishi H-2A Launching Michibiki 2 Navigation Satellite - Live Mirror And Discussion
Mitsubishi H-2A Launching Michibiki 2 Navigation Satellite - Live Mirror And Discussion
Published: 2017/06/01
Channel: Julian Danzer
PPP with QZSS LEX signal
PPP with QZSS LEX signal
Published: 2013/03/09
Channel: taroz1461
H-IIA F34 launches QZS-2 (Michibiki 2)
H-IIA F34 launches QZS-2 (Michibiki 2)
Published: 2017/06/01
Channel: SciNews
RTK GPS
RTK GPS
Published: 2018/03/11
Channel: LOTUSEUROPAS1
Spoofing GPS Signal
Spoofing GPS Signal
Published: 2014/12/26
Channel: MobileMap
Launch of Japanese JAXA HIIA-F35 rocket launch of the Michibiki-3, Aug. 19, 2017
Launch of Japanese JAXA HIIA-F35 rocket launch of the Michibiki-3, Aug. 19, 2017
Published: 2017/08/19
Channel: Lee Brandon-Cremer
H-IIA F36 launches QZS-4 (Michibiki 4/準天頂衛星 みちびき4号機)
H-IIA F36 launches QZS-4 (Michibiki 4/準天頂衛星 みちびき4号機)
Published: 2017/10/09
Channel: SciNews
Launch Update
Launch Update
Published: 2010/07/30
Channel: Kowch737
Japan launches rocket with new
Japan launches rocket with new 'Michibiki' GPS for security purposes
Published: 2017/06/01
Channel: News Today
LAUNCH OF JAPANESE H-IIA ROCKET WITH QZS-4
LAUNCH OF JAPANESE H-IIA ROCKET WITH QZS-4
Published: 2017/10/11
Channel: 小坂稔
Third Japanese GPS satellite launched successfully
Third Japanese GPS satellite launched successfully
Published: 2017/08/19
Channel: ASIA WORLD NEWS
Spazio, Giappone lancia quarto satellite di geolocalizzazione
Spazio, Giappone lancia quarto satellite di geolocalizzazione
Published: 2017/10/25
Channel: askanews
Global Positioning System: "Defense Navigation Satellite Development Program" circa (1979) USAF
Global Positioning System: "Defense Navigation Satellite Development Program" circa (1979) USAF
Published: 2018/07/17
Channel: Old Movies Reborn
Launch Update
Launch Update
Published: 2010/08/06
Channel: Kowch737
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Quasi-Zenith Satellite System
QZSS logo.png

Country/ies of origin Japan
Operator(s) JAXA
Type civilian
Status in implementation
Coverage regional
Accuracy 0.01–1 meters
Constellation size
Total satellites 4 (7 in the future)
Satellites in orbit 4
First launch September 2010
Orbital characteristics
Regime(s) 3x GSO
Other details
Cost JPY 170 billion
Website qzss.go.jp/en/
Quasi-Zenith satellite orbit
QZSS animation, the "Quasi-Zenith/tundra orbit" plot is clearly visible.

The Quasi-Zenith Satellite System (QZSS) (or Juntencho eisei shisutemu (準天頂衛星システム) in Japanese) is a project of the Japanese government for the development of a four-satellite regional time transfer system and a satellite-based augmentation system for the United States operated Global Positioning System (GPS) to be receivable in the Asia-Oceania regions, with a focus on Japan.[1] The goal of QZSS is to provide highly precise and stable positioning services in the Asia-Oceania region, compatible with GPS.[2] Four-satellite QZSS services (QZS-4) are available on a trial basis as of January 12, 2018,[3] and are scheduled to commence as a production service on November 1, 2018.[4]

History[edit]

In 2002, the Japanese government authorized the development of QZSS, as a three-satellite regional time transfer system and a satellite-based augmentation system for the United States operated Global Positioning System (GPS) to be receivable within Japan. A contract was awarded to Advanced Space Business Corporation (ASBC), that began concept development work, and Mitsubishi Electric, Hitachi, and GNSS Technologies Inc. However, ASBC collapsed in 2007, and the work was taken over by the Satellite Positioning Research and Application Center (SPAC), which is owned by four Japanese government departments: the Ministry of Education, Culture, Sports, Science and Technology, the Ministry of Internal Affairs and Communications, the Ministry of Economy, Trade and Industry, and the Ministry of Land, Infrastructure, Transport and Tourism.[5]

The first satellite "Michibiki" was launched on 11 September 2010.[6] Full operational status was expected by 2013.[7][8] In March 2013, Japan's Cabinet Office announced the expansion of QZSS from three satellites to four. The $526 million contract with Mitsubishi Electric for the construction of three satellites was scheduled for launch before the end of 2017.[9] The third satellite was launched into orbit on 19 August 2017,[10] and the fourth was launched on 10 October 2017.[11] The basic four-satellite system is planned to be operational in 2018.[12]

Orbit[edit]

QZSS uses three satellites, each 120° apart, in highly inclined, slightly elliptical, geosynchronous orbits. Because of this inclination, they are not geostationary; they do not remain in the same place in the sky. Instead, their ground traces are asymmetrical figure-8 patterns (analemmas), designed to ensure that one is almost directly overhead (elevation 60° or more) over Japan at all times.

The nominal orbital elements are:

QZSS satellite Keplerian elements (nominal)[13]
Epoch 2009-12-26 12:00 UTC
Semimajor axis (a) 42,164 kilometres (26,199 mi)
Eccentricity (e) 0.075 ± 0.015
Inclination (i) 43° ± 4°
Right ascension of the ascending node (Ω) 195° (initial)
Argument of perigee (ω) 270° ± 2°
Mean anomaly (M0) 305° (initial)
Central longitude of ground trace 135° E ± 5°

Satellites[edit]

Name Launch date Status Notes
QZS-1 (Michibiki-1) 11 September 2010 Operational -
QZS-2 (Michibiki-2) 1 June 2017 Operational Improved solar panels and increased fuel
QZS-3 (Michibiki-3) 19 August 2017 Operational Heavier design with additional S-band antenna on Geostationary orbit
QZS-4 (Michibiki-4) 10 October 2017 Operational Improved solar panels and increased fuel

QZSS and positioning augmentation[edit]

The primary purpose of QZSS is to increase the availability of GPS in Japan's numerous urban canyons, where only satellites at very high elevation can be seen. A secondary function is performance enhancement, increasing the accuracy and reliability of GPS derived navigation solutions.

The Quasi-Zenith Satellites transmit signals compatible with the GPS L1C/A signal, as well as the modernized GPS L1C, L2C signal and L5 signals. This minimizes changes to existing GPS receivers.

Compared to standalone GPS, the combined system GPS plus QZSS delivers improved positioning performance via ranging correction data provided through the transmission of submeter-class performance enhancement signals L1-SAIF and LEX from QZSS. It also improves reliability by means of failure monitoring and system health data notifications. QZSS also provides other support data to users to improve GPS satellite acquisition.

According to its original plan, QZSS was to carry two types of space-borne atomic clocks; a hydrogen maser and a rubidium (Rb) atomic clock. The development of a passive hydrogen maser for QZSS was abandoned in 2006. The positioning signal will be generated by a Rb clock and an architecture similar to the GPS timekeeping system will be employed. QZSS will also be able to use a Two-Way Satellite Time and Frequency Transfer (TWSTFT) scheme, which will be employed to gain some fundamental knowledge of satellite atomic standard behavior in space as well as for other research purposes.

QZSS timekeeping and remote synchronization[edit]

Although the first generation QZSS timekeeping system (TKS) will be based on the Rb clock, the first QZSS satellites will carry a basic prototype of an experimental crystal clock synchronization system. During the first half of the two year in-orbit test phase, preliminary tests will investigate the feasibility of the atomic clock-less technology which might be employed in the second generation QZSS.

The mentioned QZSS TKS technology is a novel satellite timekeeping system which does not require on-board atomic clocks as used by existing navigation satellite systems such as GPS, GLONASS, NAVIC or Galileo system. This concept is differentiated by the employment of a synchronization framework combined with lightweight steerable on-board clocks which act as transponders re-broadcasting the precise time remotely provided by the time synchronization network located on the ground. This allows the system to operate optimally when satellites are in direct contact with the ground station, making it suitable for a system like the Japanese QZSS. Low satellite mass and low satellite manufacturing and launch cost are significant advantages of this system. An outline of this concept as well as two possible implementations of the time synchronization network for QZSS were studied and published in Remote Synchronization Method for the Quasi-Zenith Satellite System[14] and Remote Synchronization Method for the Quasi-Zenith Satellite System: study of a novel satellite timekeeping system which does not require on-board atomic clocks.[15]

See also[edit]

References[edit]

  1. ^ Quasi-Zenith Satellite Orbit (QZO)
  2. ^ "[Movie] Quasi-Zenith Satellite System "QZSS"". Quasi-Zenith Satellite System(QZSS). Retrieved 19 July 2017. 
  3. ^ "[Notices] Start of QZS-4 Trial Service". Quasi-Zenith Satellite System(QZSS). Retrieved 2018-05-02. 
  4. ^ "Starting Date of QZSS Services". QZSS. 2 March 2018. Archived from the original on 11 March 2018. Retrieved 14 April 2018. 
  5. ^ "Service Status of QZSS" (PDF). 2008-12-12. Archived from the original (PDF) on July 25, 2011. Retrieved 2009-05-07. 
  6. ^ "Launch Result of the First Quasi-Zenith Satellite 'MICHIBIKI' by H-IIA Launch Vehicle No. 18". 2010-09-11. Retrieved 2011-12-12. 
  7. ^ "QZSS in 2010". Magazine article. Asian Surveying and Mapping. 2009-05-07. Retrieved 2009-05-07. [dead link]
  8. ^ "GNSS All Over the World". The System. GPS World Online. 2007-11-01. Archived from the original on August 23, 2011. Retrieved 2011-12-12. 
  9. ^ http://www.spaceflightnow.com/news/n1304/04qzss/ Japan to build fleet of navigation satellites 2013-04-04 Retrieved 2013-04-05
  10. ^ https://spaceflightnow.com/2017/08/19/japan-launches-navigation-satellite-after-week-long-delay/
  11. ^ https://spaceflightnow.com/launch-schedule/
  12. ^ "Service Overview - What is the QZSS?". Cabinet Office, Government of Japan. Retrieved 2016-01-20. 
  13. ^ Japan Aerospace Exploration Agency (2016-07-14), Interface Specifications for QZSS, version 1.7, pp. 7–8, archived from the original on 2013-04-06 
  14. ^ Fabrizio Tappero (April 2008), Remote Synchronization Method for the Quasi-Zenith Satellite System (PhD thesis), archived from the original on 2011-03-07, retrieved 2013-08-10 
  15. ^ Fabrizio Tappero (2009-05-24). Remote Synchronization Method for the Quasi-Zenith Satellite System: study of a novel satellite timekeeping system which does not require on-board atomic clocks. VDM Verlag. ISBN 978-3-639-16004-8. 

External links[edit]

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