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MSVMSAS Service Volume Monitor System

The MSAS Service Volume monitor system (MSV) supports satellite-based air navigation services through monitoring service levels while aircraft use GPS signals for navigation.

The MSV first calculates the protection level obtainable by an aircraft flying at a given time and location using MSAS messages and GPS almanac information, and then graphically shows the calculation result in a way that the situation per airspace can be easily obtained.
The MSV is also capable of displaying related information such as service availability (the portion of time when the protection level is below a threshold during a given period of time) and GDOP (an indicator showing the degree of accuracy obtainable with satellites' geometry to the aircraft). The MSV is furthermore capable of displaying various indicators of RAIM, a method of positioning that ensures integrity using GPS signals only.

The MSV provides past, current, and future information

imageHorizontal Protection Level Display
imageVertical Protection Level Display
imageAvalability Display

Monitoring and Prediction of GNSS (MSAS and GPS/RAIM) service levels

Monitoring Function / Replay Function

  • Monitoring Function
    • MSV monitors GNSS (MSAS and GPS/RAIM) service levels, and to provide information to users, if necessary.
    • Current services are displayed on a map in color-coding.
    • Visual and audible alarms are provided in service outage.
  • Replay Function
    • MSV replays past service levels for confirmation.
    • Past services are displayed on a map in color-coding.

 

Navigation Method

Available Displays

MSAS

(APV-I)

MSAS

(ER/NPA)

RAIM
Vertical Protection Level
Horizontal Protection Level - -
Protection Level/Threshold Difference
Availability
GDOP
APV-Ⅰ Status - -

Replay time frame can be set with simple operation.

Prediction Function

  • MSV predicts GNSS (MSAS and GPS/RAIM) service levels. Results are used for NOTAM issuance.
  • Predictions are displayed on a map in color-coding.
  • Service outage predictions are output on a printer.
  • Prediction time frame can be set with simple operation.
 

Navigation Method

Available Displays

MSAS

(APV-I)

MSAS

(ER/NPA)

RAIM
Vertical Protection Level -
Horizontal Protection Level - - -
Protection Level/Threshold Difference -
Availability -
GDOP -

Performance

  • Display Update Rate
    • 20 seconds (in monitoring function)
  • Display /Calculation Resolution
    • 1-degree latitude-longitude grid and up to 500 user-defined locations

Communications
ADS/CPDLC
Navigation
GBAS
MSAS
MSV
Surveillance
ASR
SSR
ADS-B
Air Traffic Control
TRCS
ARTS

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