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MSAS User Segment
| MSAS | |
|---|---|
| Title | MSAS User Segment |
| Author(s) | GMV. |
| Level | Basic |
| Year of Publication | 2011 |
The Multi-functional Satellite Augmentation System (MSAS) is the Japanese 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 Japanese Ministry of Land, Infrastructure and Transport and the Japan Meteorological Agency (JMA). Tests during Initial Operational Phases were accomplished successfully, and MSAS for aviation use was commissioned on September 27, 2007.[1]
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)[2] 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 User Segment
The MSAS 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 MTSAT satellites. MSAS receivers design is identical to those design for WAAS. The different is that besides processing WAAS signals from WAAS GEO satellites, they also process the signals from the Japanese MTSAT geo-stationary satellites.
MSAS user equipment for civil aviation (Safety-of-Life service) shall be compliant (certified) against several standards, i.e. RTCA MOPS DO 229 (see article SBAS Standards).