amit199013
Adept
hi guys, i see many members gets confused with the terms A-GPS(assisted global positioning system), GPS, and network based positioning system. So i will try to clear the things as much as i can.
FIRST OF ALL, what is GPS?
the system by which position of the gps reciever can be defined in terms of LATITUDE, LONGITUDE, AND ALTITUDE.
this task is done by using satellites which are revolving around the earth and this data is publicly available. means everybody who has a gps receiver can know the co-ordinates.
so, now we can see that no cellular network is involved in position system. so if u have a phone which has a gps receiver built in, u can know your co-ordinates (at least..)without the packet data or without the internet connection.
----------------------------------------------------------------------------------------------------------------------------------------------------
TTFF-(Time To First Fix) is the time how long before you get your location pinpointed. This initial TTFF is often called a “cold startâ€.
----------------------------------------------------------------------------------------------------------------------------------------------------
now our next term is A-GPS.
so "A" stands here for assisted, so as the name suggests, it assists(helps) in getting a lock to the satellite faster. and it requires data connection to the assistance servers so data charges apply here.
remember, it is always gps with A-gps support. a-gps cannot work without the gps chipset, but gps can still work without a-gps.
----------------------------------------------------------------------------------------------------------------------------------------------------
next comes network based positioning system.
it is just the location(co-ordinates) of the tower from where u r receiving ur network(cellular) signal. so it cant be used for turn by turn navigation.
----------------------------------------------------------------------------------------------------------------------------------------------------
now the use of gps information.
suppose u know the co-ordinates of the location, you can easily pinpoint the location on the map. the same way gps works. the gps receiver gets the co-ordinates and it is then pinpointed on the map.
now to pin point the location one need a map in pocket or needs to buy is. so same with the mobile phones, either phone must have the maps stored in, or have to download the map, which will require data connection and data charges apply.
FIRST OF ALL, what is GPS?
the system by which position of the gps reciever can be defined in terms of LATITUDE, LONGITUDE, AND ALTITUDE.
this task is done by using satellites which are revolving around the earth and this data is publicly available. means everybody who has a gps receiver can know the co-ordinates.
so, now we can see that no cellular network is involved in position system. so if u have a phone which has a gps receiver built in, u can know your co-ordinates (at least..)without the packet data or without the internet connection.
----------------------------------------------------------------------------------------------------------------------------------------------------
TTFF-(Time To First Fix) is the time how long before you get your location pinpointed. This initial TTFF is often called a “cold startâ€.
----------------------------------------------------------------------------------------------------------------------------------------------------
now our next term is A-GPS.
so "A" stands here for assisted, so as the name suggests, it assists(helps) in getting a lock to the satellite faster. and it requires data connection to the assistance servers so data charges apply here.
remember, it is always gps with A-gps support. a-gps cannot work without the gps chipset, but gps can still work without a-gps.
----------------------------------------------------------------------------------------------------------------------------------------------------
next comes network based positioning system.
it is just the location(co-ordinates) of the tower from where u r receiving ur network(cellular) signal. so it cant be used for turn by turn navigation.
----------------------------------------------------------------------------------------------------------------------------------------------------
now the use of gps information.
suppose u know the co-ordinates of the location, you can easily pinpoint the location on the map. the same way gps works. the gps receiver gets the co-ordinates and it is then pinpointed on the map.
now to pin point the location one need a map in pocket or needs to buy is. so same with the mobile phones, either phone must have the maps stored in, or have to download the map, which will require data connection and data charges apply.
