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The Multi-functional Satellite Augmentation System (MSAS) is the Japanese [[SBAS General Introduction|SBAS]] System: a GPS Augmentation system with the goal of improving its accuracy, integrity, and availability, and that uses the Multifunctional Transport Satellites (MTSAT)  owned and operated by the [http://www.mlit.go.jp Japanese Ministry of Land, Infrastructure and Transport] and the [http://www.jma.go.jp Japan Meteorological Agency (JMA)]. Tests during Initial Operational Phase were accomplished successfully, and MSAS for aviation use was declared operational on September 27, 2007.<ref>[http://en.wikipedia.org/wiki/Multi-functional_Satellite_Augmentation_System MSAS in Wikipedia]</ref>
The MTSAT Satellite Augmentation System (MSAS) is the Japanese [[SBAS General Introduction|Satellite Based Augmentation System (SBAS)]] System:<ref name="MSAS_STATUS_2007">[http://www.oosa.unvienna.org/pdf/icg/2007/icg2/presentations/04_01.pdf MSAS Current Status, Japan Civil Aviation Bureau,] [http://www.oosa.unvienna.org/oosa/SAP/gnss/icg/icg02/presentations.html Second Meeting of the International Committee on Global Navigation Satellite Systems (ICG) organized by the International Space Research Organization,  Bangalore, India , 5 - 7 September 2007]</ref> a GPS Augmentation system with the goal of improving its accuracy, integrity, and availability, and that uses the Multifunctional Transport Satellites (MTSAT)  owned and operated by the [http://www.mlit.go.jp Japanese Ministry of Land, Infrastructure and Transport] and the [http://www.jma.go.jp Japan Meteorological Agency (JMA).]
First tests were accomplished successfully, and MSAS system for aviation use was declared operational in September 27, 2007,<ref name="MSAS_STATUS_2007_2">[http://www.navcen.uscg.gov/pdf/cgsicMeetings/47/%5B24%5Dqzzmsas.pdf QZSS / MSAS Status,] CGSIC –47th Meeting ,Fort Worth, Texas September25, 2007, Satoshi KOGURE, [http://www.jaxa.jp/index_e.html Japan Aerospace Exploration Agency,] QZSS Project Team</ref><ref name="MSAS_GPSW">[http://www.gpsworld.com/survey/perspectives-late-april-2008-7289 Eric Gakstatter, Perspectives - Late April 2008, GPSworld, April 15, 2008]</ref> providing a service of horizontal guidance for En-route through Non-Precision Approach.<ref name="MSAS_STATUS_2007"/><ref name="MSAS_STATUS_2007_2"/><ref name="MSAS_STATUS_2008">[http://www.oosa.unvienna.org/pdf/icg/2008/icg3/08-1.pdf Overview of MSAS, Presentation for ICG-3, 2008]</ref>
 
 


==MSAS Architecture==
==MSAS Architecture==


GPS signals are received at the MSAS Ground Monitor Stations and MSAS Monitor & Ranging Stations. These stations check operational status of GPS, and transmit GPS data to Master Control Stations that analyze GPS error and ionospheric delay. Then, these Master stations compute Augmentation information and broadcast it to GEO MTSAT (Multi-functional Transport Satellite)<ref>[http://en.wikipedia.org/wiki/Multi-Functional_Transport_Satellite MTSAT in Wikipedia]</ref> satellites. Those satellites, MTSAT, rebroadcast the correction messages back to Earth, where MSAS-enabled GPS receivers use the MSAS corrections to compute a reliable and accurate position.
MSAS works by processing GPS data collected by a network of reference stations to generate the SBAS message which is uploaded to the GEO satellites. The GEO satellites broadcast this information to the user receivers, which compute the aircraft positioning and inform on potential alert messages.<ref name="MSAS_STATUS_2008"/>


[[File:MSAS_Architecture.PNG|thumb|350px|MSAS Architecture]]
[[File:MSAS_Architecture.PNG|thumb|350px|MSAS Architecture]]


The main layers of MSAS architecture are:<ref>[http://www.oosa.unvienna.org/pdf/icg/2008/icg3/08-1.pdf Overview of MSAS, Presentation for ICG-3, 2008]</ref>
The main layers of MSAS architecture are:<ref name="MSAS_STATUS_2008"/>


*[[Work in Progress:MSAS Ground Segment|MSAS Ground Segment]]:  The ground segment is composed of four Ground Monitor Station (GMS) that collect information on the GPS and MTSAT signals. Then, the GMS send their data to two Master Control Station (MCS) in Kobe and Hitachiota, that compute precise differential corrections and integrity bounds and send them to the MTSAT satellites for rebroadcast to the User Segment. The MSAS Ground Segment is completed with two Monitor and Ranging Station (MRS), whose purpose is primarily the correct orbit determination of the MTSAT satellites.  
*[[Work in Progress:MSAS Ground Segment|MSAS Ground Segment]]:  The ground segment is composed of four Ground Monitor Station (GMS) that collect information on the GPS and MTSAT signals. Then, the GMS send their data to two Master Control Station (MCS) in Kobe and Hitachiota, that compute precise differential corrections and integrity bounds and send them to the MTSAT satellites for rebroadcast to the User Segment. The MSAS Ground Segment is completed with two Monitor and Ranging Station (MRS), whose purpose is primarily the correct orbit determination of the MTSAT satellites.  


*[[Work in Progress:MSAS Space Segment|MSAS Space Segment]]: The space segment consists of two geosynchronous satellites (GEO): the Multifunctional Transport Satellites (MTSAT). These satellites are used also for weather/meteorological purposes. Their navigation payloads are in charge of broadcasting the correction messages generated by the Master Stations for reception by the User segment.  
*[[Work in Progress:MSAS Space Segment|MSAS Space Segment]]: The space segment consists of two geosynchronous satellites (GEO): the Multifunctional Transport Satellites (MTSAT). These satellites are used also for meteorological purposes. Their navigation payloads are in charge of broadcasting the correction messages generated by the Master Control Stations for reception by the User Segment.  


*[[Work in Progress:MSAS User Segment|MSAS User Segment]]: The user segment is the GPS and SBAS-enabled receiver, which uses the information broadcast from each GPS satellite to determine its location and the current time, and receives the MSAS corrections from the Space segment.
*[[Work in Progress:MSAS User Segment|MSAS User Segment]]: The user segment is the GPS and SBAS-enabled receiver, which uses the information broadcast from each GPS satellite to determine its location and the current time, and receives the MSAS corrections from the Space Segment.


==Notes==
==Notes==

Revision as of 06:24, 2 August 2011


MSASMSAS
Title MSAS Architecture
Author(s) GMV.
Level Basic
Year of Publication 2011
Logo GMV.png


The MTSAT Satellite Augmentation System (MSAS) is the Japanese Satellite Based Augmentation System (SBAS) System:[1] a GPS Augmentation system with the goal of improving its accuracy, integrity, and availability, and that uses the Multifunctional Transport Satellites (MTSAT) owned and operated by the Japanese Ministry of Land, Infrastructure and Transport and the Japan Meteorological Agency (JMA).

First tests were accomplished successfully, and MSAS system for aviation use was declared operational in September 27, 2007,[2][3] providing a service of horizontal guidance for En-route through Non-Precision Approach.[1][2][4]


MSAS Architecture

MSAS works by processing GPS data collected by a network of reference stations to generate the SBAS message which is uploaded to the GEO satellites. The GEO satellites broadcast this information to the user receivers, which compute the aircraft positioning and inform on potential alert messages.[4]

MSAS Architecture

The main layers of MSAS architecture are:[4]

  • MSAS Ground Segment: The ground segment is composed of four Ground Monitor Station (GMS) that collect information on the GPS and MTSAT signals. Then, the GMS send their data to two Master Control Station (MCS) in Kobe and Hitachiota, that compute precise differential corrections and integrity bounds and send them to the MTSAT satellites for rebroadcast to the User Segment. The MSAS Ground Segment is completed with two Monitor and Ranging Station (MRS), whose purpose is primarily the correct orbit determination of the MTSAT satellites.
  • MSAS Space Segment: The space segment consists of two geosynchronous satellites (GEO): the Multifunctional Transport Satellites (MTSAT). These satellites are used also for meteorological purposes. Their navigation payloads are in charge of broadcasting the correction messages generated by the Master Control Stations for reception by the User Segment.
  • MSAS User Segment: The user segment is the GPS and SBAS-enabled receiver, which uses the information broadcast from each GPS satellite to determine its location and the current time, and receives the MSAS corrections from the Space Segment.

Notes

References

  1. ^ a b MSAS Current Status, Japan Civil Aviation Bureau, Second Meeting of the International Committee on Global Navigation Satellite Systems (ICG) organized by the International Space Research Organization, Bangalore, India , 5 - 7 September 2007
  2. ^ a b QZSS / MSAS Status, CGSIC –47th Meeting ,Fort Worth, Texas September25, 2007, Satoshi KOGURE, Japan Aerospace Exploration Agency, QZSS Project Team
  3. ^ Eric Gakstatter, Perspectives - Late April 2008, GPSworld, April 15, 2008
  4. ^ a b c Overview of MSAS, Presentation for ICG-3, 2008
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