10 | Operation
a modulation technique known as FDMA (Frequency
Deviation Multiple Access). They have the same
polarization as the GPS signals and have comparable
signal strength.
The signal of the GLONASS satellite includes the Satellite
ID, Positioning, velocity, acceleration, satellite health,
time and time offset and almanac of all GLONASS
satellites.
The GLONASS system is based on 24 satellites using
12 different frequencies. This was made possible by
using the same frequency on antipodal satellites. These
are satellites that are in the same orbital plane but are
separated by 180°.
Antipodal Satellites
Both satellites are transmitting
on the same frequency
GPS and GLONASS
Combining the GPS and GLONASS system provides the
following advantages:
• Better signal acquisition times
• Better position and time accuracy
• Reduces the physical blocking of signal in urban cities
where tall buildings are the norms
• Better satellite geometry resulting in better HDOP
