Gps Differential Stations

How can we perform Differential GPS technique in simple way?

Differential GPS is useful to reduce errors when taking coordinates readings of a point on earth. in fact, and due to many reasons when we take latitude and logitude of a point using our standard GPS receiver , the readings will be shown somewhere els !

There is so many ways to reduce errors
one is and less coastly , using two receivers and set one as a base station … the question is HOW ??

Appreciate everyone who tried and simplified it here for me

Thanks in advance

You have received two excellent answers so far. But I think you are still wondering how to do a differential land survey, right? Can you get hold of two GPS and two laptop PCs? It is then just a matter of registering the two positions and time sets and compare them later. I don’t know your budget for this project but you could e.g. buy cheap PDA with GPS incorportated. You’ll find cheap ones like Mio and Acer. You’ll most probably find also freeware or shareware that reads the NMEA port of the GPS and creates a file with position and time. Then you might want to write your own application that reads both files, compare position for the same time and calculate the offset in whatever unit you want. Most probably when working at this accuracy, your geographical position is not important, only the relative one from one GPS to the other. But if you have a map reference, you can trace it from that. As a warning, don’t use GWS84 references on an old map. I know from experience that e.g. nautical charts may be very relatively accurate but inaccurate to a common world reference such as GWS84.

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