Then calculate the difference between the two GPS data to get a better relative position of the mobile GPS?
I need to get a relative Accuracy of less then one meter...
Any other suggestions?
thanks!
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In the the US and Europe there are working SBAS satellites (WAAS in the US, and EGNOS in Europe).
These sats can be thought as a low resolution DGPS.
I know that for WAAS, the accuracy is usually less than 1 meter (in open areas, not urban).
Make sure you've activated the SBAS option in your GPS module.
When going for a real DGPS solution, things start getting expensive and complicated.
Just calculating the difference between 2 GPS receivers ("poor man's GPS") won't work too good, as far as I've seen in the past.
uBlox products do support DGPS, but as said, and as correct to all/most consumer grade small-sized GPS modules, they only "support" it, you have to do some development of your own (transfer the DGPS data in real time on another RF channel).
Not sure you want to go there :-)
Cheers.