The current status of global navigation satellite systems GNSS. Case study : comparative study of getting positions in Gaza City based on operating GNSS systems

الملخص EN

GNSS applications in all fields play a key role, moving its use from navigation domain to multimodal use outdoors and indoors.

Although, some GNSS systems like United States' GPS and Russian GLONASS are fully operated, modernization of these systems is still on-going.

The European Unions' Galileo and the Chinese COMPASS GNSS systems are expected to be in full service in global navigation modes by 2020.

Some other regional navigation systems such as the Japanese QZSS and the Indian IRNSS are being under development and expected to be completed and implemented through the coming few years.

This study aims to investigate and report the current status of GNSS systems and to focus on its applications and use in the Gaza Strip.

A comparative analytical case study of getting positions in Gaza City and based on GPS, GLONASSS and GPS + GLONASS multifrequency data is performed.

It shows that about 56 % improvements in the positioning accuracy is obtained when considering GPS + GLONASS data instead of GPS data alone and 69 % compared with that of using GLONASS data alone.