hallo friends... This is mahesh kedari... I am thinking to design a GPS system using ground antennas.. I know that to launch this system will be very much challenging but still not impossible... I expect all of you guys to put your own views over it... here are my views for this system
this system will eliminate the use of satellite hence to reduce the cost of GPS system... in this system three (minimum) poles will be established around each city. What all user has to do is just to give the destination to this system.. system itself is expected to identify the position of user and guide its vehical according to minimum distance and minimum traffic... tracing the path will not be difficult as the software will store the map of all roads in the city and all location .. and using graph theory it is possible to trace the minimum distance path.. but identifying the exact location of user will be a real challenge.. i have mentioned 3 towers(minimum) because if they are covering the circular path then minimum 3 circles can define a unique point hence to identify the exact positon.. now the challenges are .1) uneven surface of the city 2) building creating shadow zone 3) reflections created by building and other towers
i think smart antennas can do the job.. but still can not give enough accuracy.. so please guys put your own view above this topic....(I'll add the information regularly that im getting on this topic ) ..... thank you..