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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)]. 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 ([[Work in Progress:MSAS General Introduction|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>


GPS signals are received at the MSAS Ground Monitor Stations (GMS) 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 Performances==
==MSAS Performances==


MSAS for aviation use was commissioned on September 27, 2007. MSAS provide service for air navigation:
MSAS for aviation use was commissioned on September 27, 2007. MSAS provides service for air navigation with the following characteristics:<ref name="MSAS_STATUS_2008"/>
*24 hours a day, 7 days a week.
*Operational Information is provided as ''notice to airmen'' (NOTAM).<ref>[http://www.skybrary.aero/index.php/NOTAM Description of NOTAM]</ref>
*Use for En-route through Non Precision Approach (NPA) phase of flight, horizontal guidance only.
*Service over the [http://www.mlit.go.jp/koku/04_hoan/e/04.pdf Fukuoka Flight Information Region].


– 24 hours a day, 7 days a week.
Performances are usually described in terms of accuracy, integrity, availability and continuity. The MSAS Performance Requirements Vs. observed performances for En-route through Non Precision Approach (NPA) phase of flight are:<ref name="MSAS_STATUS_2008"/>
 
*Horizontal Accuracy (95%)
– Operational Information is provided as NOTAM. <ref>[http://www.skybrary.aero/index.php/NOTAM Description of NOTAM]</ref>
**Required : Less than 220m (with SA on)
 
**Observed value is less than 2.2m
– Use for En-route through Non Precision Approach (NPA) phase of flight (Performance improvement plan under development).
*Integrity (Probability of HMI)
 
**Required : Less than 1x10-7/hour
Performances are usually described in terms of accuracy, integrity, availability and continuity. The MSAS Performance Requirements vs observed performances for En-route through Non Precision Approach (NPA) phase of flight are:<ref>[http://www.oosa.unvienna.org/pdf/icg/2008/icg3/08-1.pdf Overview of MSAS, Presentation for ICG-3, 2008]</ref>
**Fault Tree Analysis leads 0.903x10-7/hour
 
*Availability
• Horizontal Accuracy (95%)
**Required : More than 99.9%
 
**Observed : 99.926%
– Required : Less than 220m (with SA on)
 
– Observed value is less than 2.2m
 
• Integrity (Probability of HMI)
 
– Required : Less than 1x10-7/hour
 
– Fault Tree Analysis leads 0.903x10-7/hour
 
• Availability
 
– Required : More than 99.9%
 
– Observed : 99.926%
 
Due to the fact that MTSAT signal are broadcast through the majority region of Asian/Pacific, and there are two MTSAT Monitor stations in Hawaii (USA) and Camberra (Australia), the MSAS service area could be easily expanded if more GMS stations would be installed in MTSAT coverage area.


For the near future, there is a plan under development with the following priorities:
For the near future, there is a plan under development with the following priorities:
*Support LPV-200 capability (additional GMS, software improvement)  
*Support LPV-200 capability (additional GMS, software improvement).
*Changes for transition to Dual Frequency (L1-L5) operations.
*Changes for transition to dual frequency SBAS (L1-L5) operations.


==Notes==
==Notes==

Revision as of 08:10, 2 August 2011


MSASMSAS
Title MSAS Performances
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 Performances

MSAS for aviation use was commissioned on September 27, 2007. MSAS provides service for air navigation with the following characteristics:[4]

  • 24 hours a day, 7 days a week.
  • Operational Information is provided as notice to airmen (NOTAM).[5]
  • Use for En-route through Non Precision Approach (NPA) phase of flight, horizontal guidance only.
  • Service over the Fukuoka Flight Information Region.

Performances are usually described in terms of accuracy, integrity, availability and continuity. The MSAS Performance Requirements Vs. observed performances for En-route through Non Precision Approach (NPA) phase of flight are:[4]

  • Horizontal Accuracy (95%)
    • Required : Less than 220m (with SA on)
    • Observed value is less than 2.2m
  • Integrity (Probability of HMI)
    • Required : Less than 1x10-7/hour
    • Fault Tree Analysis leads 0.903x10-7/hour
  • Availability
    • Required : More than 99.9%
    • Observed : 99.926%

For the near future, there is a plan under development with the following priorities:

  • Support LPV-200 capability (additional GMS, software improvement).
  • Changes for transition to dual frequency SBAS (L1-L5) operations.

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
  5. ^ Description of NOTAM
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