What global position satellite systems is the batter GLONASS or are GPS navigation system.?

what is the main deference between the two systems. what are the advantages and disadvantage|||GPS. It is slightly more accurate and other than GLONASS, really working already.





The difference between both is also the aspect, that GPS expects more intelligence from the receiver, which in turn made it easier to improve the accuracy with software updates.





But once Galileo starts operation, this will likely replace GPS as most accurate navigation service, at least until the next generation of NAVSTAR satellites gets done.





PS: GPS has also no full coverage... it has even less coverage as GLONASS, as GLONASS has higher inclination orbits. But GPS has a complete constellation, while GLONASS still has many satellite slots empty.|||GPS is technically a more accurate system. The clock tolerances on the SVs are better plus GLONASS uses very slightly different frequencies for each SV's transmission which in theory at least can cause different delays on each signal.





This is however a fairly academic question since most systems are either purely GPS or GPS/GLONASS combined systems.





GALILEO is in theory a better system than GPS if the EU ever gets its act together. Due to the rather silly choice of codes for GALILEO the receivers will be more complex and so more costly however by the time GALILEO is functional enough to use on its own that shouldn't be much of an issue.





Combined GPS/GLONASS/GALILEO systems are already on sale which will use signals from all 3 systems in order to give the best possible position.


Just don't expect to see any of those on sale in the local electronics store any time soon, the cost is a little on the high side.|||The major technical differences are as follows:


- GPS uses a CDMA (code division multiple access) technique to transmit satellite data, GLONASS uses an FDMA (frequency division multiple access) technique to transmit satellite data. In other words, GPS uses the same frequency but [slightly] different code modulations for each satellite, while GLONASS transmits the same code modulation but different frequencies each satellite


- The respective space segments (i.e. satellites) have their own unique characteristics (e.g. # of orbital planes, ascending nodes, # of satellites per orbital plane, orbital periods, etc). GLONASS' space segment was designed to best suit coverage for Russia.


- GPS works in a datum called WGS84, GLONASS works in PZ90





Technically, GPS is a more "accurate" system but the real advantages/disadvantages are really more political/logistical. As previously mentioned, the GLONASS system isn't fully operational. So you won't get as many GLONASS satellites as you would GPS and you couldn't rely on GLONASS as a stand-alone system. However, GLONASS can be used (and is used) as a compliment to GPS. The addition of GLONASS measurements can be used to enhance GPS performance.





Depending on how your using the system, there may also be features in your GPS receiver that monitor integrity of the signals you are tracking (e.g. RAIM, FDE/FDI). These features will provide better accuracy by excluding bad signals. [To my knowledge] The degraded state of GLONASS don't allow similar features in a GLONASS receiver.|||GPS. GLONASS has not been serviced for a number of years and has a large number of coverage problems. Although Russian does intend to rebuild the system, likely as not it will not have full coverage.