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I am totally new at this field and I want to use Rinex data to add more precision to my GPS receiver.

I don't know where to start and even I spend a lot of time googling, I just got more confused.

Can anyone help me with a starting point?

I want to determine the exact 3D position of a flying quadrotor while flying (So i need the position realtime).

The main project is multi-agent UAV flying, so their position has to be accurate enough to prevent crashing during flight. Also for accurate landing in a desired position.

In the first phase I need to know position relative to a ground station in a not so far distance (I mean about 5-7 meter from robot). And this station (the positioning reference) doesn't move.

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For a UAV research project, you may want to take a look at the Canberra UAV pyUBlox real time corrections project. That is open source, so you can see what is happening and tweak it to suit your needs.

There was a recent talk about this at linux.conf.au. Video is available.

Also check the wikipedia page for RTK if you haven't see this already.

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