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The MTSAT Satellite Augmentation System ([[MSAS General Introduction|MSAS]]) is the Japanese [[SBAS General Introduction|Satellite Based Augmentation System (SBAS)]] System:<ref name="MSAS_STATUS_2007">[http://www.unoosa.org 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).]<ref name=MTSAS_WIKI_1>[http://en.wikipedia.org/wiki/Multi-Functional_Transport_Satellite Multi-Functional Transport Satellite] in [http://en.wikipedia.org/ Wikipedia]</ref>
First tests were accomplished successfully, and MSAS system for aviation use was declared operational in September 27, 2007,<ref name="MSAS_STATUS_2007_2">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/surveyperspectives-late-april-2008-7289 Eric Gakstatter, Perspectives - Late April 2008, GPSworld, April 15, 2008]</ref><ref name=MSAS_WIKI_2>[http://en.wikipedia.org/wiki/Multi-functional_Satellite_Augmentation_System Multi-functional Satellite Augmentation System] in [http://en.wikipedia.org/ Wikipedia]</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.unoosa.org Overview of MSAS, Presentation for ICG-3, 2008]</ref>


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 had been accomplished successfully, and MSAS for aviation use was commissioned on September 27, 2007.<ref>[http://en.wikipedia.org/wiki/Multi-functional_Satellite_Augmentation_System MSAS in Wikipedia]</ref>
MSAS receives GPS signal at the Ground Monitor Stations and the Monitor & Ranging Stations, checks operational status of GPS, analyze GPS error and ionospheric delay, and then broadcasts augmentation information through MTSAT (Multi-functional Transport Satellite)<ref>[http://en.wikipedia.org/wiki/Multi-Functional_Transport_Satellite MTSAT in Wikipedia]</ref> from the Master Control Stations. Those satellites, MTSAT, broadcast the correction messages back to Earth, where MSAS-enabled GPS receivers use the corrections while computing their positions to improve accuracy.


==MSAS Signal Structure==
==MSAS Signal Structure==


• [[SBAS Fundamentals|Signal characteristics]] are compliant with ICAO SARPs:<ref name="ICAO_SARPS">[http://www.icao.org ICAO] Standards and Recommended Practices, Annex 10, Volume 1 Radio Navigation Aids, July 2006</ref>
[[SBAS Fundamentals|Signal characteristics]] are compliant with ICAO SARPs:<ref name="MSAS_STATUS_2008"/><ref name="ICAO_SARPS">[http://www.icao.org ICAO] Standards and Recommended Practices, Annex 10, Volume 1 Radio Navigation Aids, July 2006</ref>
 
*Frequency ; L1 = 1575.42MHz.
– Frequency ; L1 = 1575.42MHz.
*Bandwidth ; L1 ±2.2 MHz band.
 
*Data Rate; 500 symbols per Second, 1/2 convolutional encoded with a Forward Error Correction (FEC) code (250 effective bits per second).
– Bandwidth ; L1 ±2.2 MHz band.
*Signal strength on the earth surface >-161dBw at 5 degrees elevation.
 
– Data Rate; 500 symbols per Second, 1/2 convolutional encoded with a Forward Error Correction (FEC) code (250 effective bits per second).
 
– Signal strength on the earth surface >-161dBw at 5 degrees elevation.
 
• The future lines for signals are:<ref>[http://www.oosa.unvienna.org/pdf/icg/2008/icg3/08-1.pdf Overview of MSAS, Presentation for ICG-3, 2008]</ref>
 
– Band width expansion for L1.


– L5 signal.
The future lines of improvement of MSAS signals are:<ref name="MSAS_STATUS_2008"/>
*Band width expansion for L1.
*L5 signal (preparation for Dual-Frequency operations).
*Compatibility & Interoperability achivement between the different SBAS and GNSS constellations.


– Compatibility & Interoperability achivement.
For an introduction on the signal structure, please refer to the article [[The EGNOS SBAS Message Format Explained]].


==Notes==
==Notes==

Revision as of 20:04, 26 August 2018


MSASMSAS
Title MSAS Signal Structure
Edited by 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).[2]

First tests were accomplished successfully, and MSAS system for aviation use was declared operational in September 27, 2007,[3][4][5] providing a service of horizontal guidance for En-route through Non-Precision Approach.[1][3][6]


MSAS Signal Structure

Signal characteristics are compliant with ICAO SARPs:[6][7]

  • Frequency ; L1 = 1575.42MHz.
  • Bandwidth ; L1 ±2.2 MHz band.
  • Data Rate; 500 symbols per Second, 1/2 convolutional encoded with a Forward Error Correction (FEC) code (250 effective bits per second).
  • Signal strength on the earth surface >-161dBw at 5 degrees elevation.

The future lines of improvement of MSAS signals are:[6]

  • Band width expansion for L1.
  • L5 signal (preparation for Dual-Frequency operations).
  • Compatibility & Interoperability achivement between the different SBAS and GNSS constellations.

For an introduction on the signal structure, please refer to the article The EGNOS SBAS Message Format Explained.

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. ^ Multi-Functional Transport Satellite in Wikipedia
  3. ^ a b QZSS / MSAS Status, CGSIC –47th Meeting ,Fort Worth, Texas September25, 2007, Satoshi KOGURE, Japan Aerospace Exploration Agency, QZSS Project Team
  4. ^ Eric Gakstatter, Perspectives - Late April 2008, GPSworld, April 15, 2008
  5. ^ Multi-functional Satellite Augmentation System in Wikipedia
  6. ^ a b c Overview of MSAS, Presentation for ICG-3, 2008
  7. ^ ICAO Standards and Recommended Practices, Annex 10, Volume 1 Radio Navigation Aids, July 2006
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