I don't need absolute position of two vehicles.

I just need the relative position between two vehicles.

My aim is display the neighbor vehicle's location based on my vehicle
location by GPS information exchange.

if my location have 2m error and other vehicle has the same 2m error with
the same direction, it is OK to me.

Then you need "Moving-Base" RTK positioning. RTKlib provides that option, but I've never used it. Do a google search on "moving base RTK" and you should find the basics, it seems to be designed exactly for what you are looking for.

Mauro Ugarte A.
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