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MSAS General Introduction

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Title MSAS General Introduction
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. First tests were accomplished successfully, and MSAS system for aviation use was declared operational in September 27, 2007,[2][3][4] providing a service of horizontal guidance for En-route through Non-Precision Approach.[1][2][5] The SBAS signal used to be transmitted from MTSAT (Multi-functional Transport Satellites) operated by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT). The SBAS signal that is made by MLIT is now transmitted from the QZS-3 GEO satellite using the QZSS SBAS transmission service since April 2020.[6]

MSAS Related Articles

The following articles include further information about different important topics related to a MSAS:

MSAS Versions

The following table shows a brief description of the system's configuration for each operational step [7]:

MSAS Version Topics
Initial Performance Phase
(2007 - 2020)
Operation with MTSAT, 2 Master Control Station (MCS) and 6 Ground Monitor Stations (GMS) by 2020.
System Update Phase
(2020 - 2023)
Operational takeover to GEO QZS-3.
Full replacement of SBAS ground system.
2 MCS, 13 GMS and 3 Uplink Station in domestic.
Performance equal or higher than MSAS V1.
LPV Performance Phase
(2023 - )
Vertical guidance: LPV operation by two or more GEOs.
Need development of high performance IONO software for low latitude magnetic equatorial region based on the research outcome from ENRI.
DFMC Validation Phase
(2017 - )
In support of ICAO SARPs validation activity, the initial performance starts with LPV 200.
ENRI has started DFMC SBAS experiment in 2017 with QZS2.
QZS3 and QZS4 will be used for DFMC SBAS validation.