Function is to enhance the Basic systems above and the primary objective is for navigation safety
WAAS
EGNOS
MASAS
GAGAN
GPS-Glonass
Outcome of differences of capabilities and outcome for precision but Glonass so far has 9 Satellites operational
Galileo
Truely a system of innovations that their objective is more with the safety of public in navigation and transport systems –benefit of Institutions and Organisations
Common Attributes
Satellite Components
Ground and Geosystem Control Stations
User Segment
GPS Signal Frequencies
L1 on 1575.42 Mhz
L2 on 1227.6 MHz
L5 on 1176.45 MHz
GPS has L3 and for Atomic Bomb detection and also adding the L5 for safety in the modernisation program
Galileo is almost like GPS but compared to GPS is the implementation of global/regional segments for integrity monitoring
Galileo Objective
To assist the Safety critical aircraft navigation, locate and guide railway trains operations
ECEF (Earth Centred, Earth Fixed) Geocentric System
Relationship with the Geographic System Lat, Long and Height
Galileo Refers to Galelio Terrestrial Reference Frame (GTRF) similar to ITRF
GTRF and WGS84 differ by few cm
Glonass- PZ90 Coordinate System ITRF of WGS84 System and on ECEF system
IERS does the transformation of the system
Observation Techniques
Measure the difference of time travel from the satellite to the receiver to compute location and time
Signal Frequencies
Code Pseudorang Measurments for very basic Receivers- Standalone