If you wish to contribute or participate in the discussions about articles you are invited to contact the Editor
MSAS Signal Structure
| MSAS | |
|---|---|
| Title | MSAS Signal Structure |
| Edited by | GMV |
| Level | Basic |
| Year of Publication | 2011 |
The MTSAT Satellite Augmentation System (MSAS) is the Japanese Satellite Based Augmentation System (SBAS) System, a GNSS 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,[1][2][3] providing a service of horizontal guidance for En-route through Non-Precision Approach. 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.[4]
MSAS Signal Structure
Signal characteristics are compliant with ICAO Standards and Recommended Practices (SARPs), Annex 10 - Aeronautical Telecommunications, Volume I - Radio Navigational Aids, July 2023.
- 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:
- Band width expansion for L1.
- DFMC L5 SBAS experiments are being conducted successfully, confirming that L5 SBAS augments multi-constellation of GPS + GLONASS + Galileo + BeiDou + QZSS. [5]
For an introduction on the signal structure, please refer to the article The EGNOS SBAS Message Format Explained.
Notes
References
- ^ QZSS / MSAS Status, CGSIC –47th Meeting ,Fort Worth, Texas September25, 2007, Satoshi KOGURE, Japan Aerospace Exploration Agency, QZSS Project Team
- ^ Eric Gakstatter, Perspectives - Late April 2008, GPSworld, April 15, 2008
- ^ Multi-functional Satellite Augmentation System in Wikipedia
- ^ SBAS Transmission Service, QZSS Official Website
- ^ QZSS Update ICG-13 Providers System and Service Updates, Nov. 5, 2018, Xi’an, China