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 |
| 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 had been accomplished successfully, and MSAS for aviation use was commissioned on September 27, 2007.[1]
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)[2] 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
• Signal characteristics are compliant with ICAO SARPs:[3]
– 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.
• Planned signals:
– Band width expansion for L1.
– L5 signal.
– Compatibility & Interoperability achivement.
Notes
References
- ^ MSAS in Wikipedia
- ^ MTSAT in Wikipedia
- ^ ICAO Standards and Recommended Practices, Annex 10, Volume 1 Radio Navigation Aids, July 2006