Has anybody here looked into making their own GPS reciever ?
I am thinking of designing one to go into my model rocket, to feed back real time position data to a laptop, however I don't have much of a clue where to start.
Map data is not important, the key data shall be the raw lat, long and alt plotted against time, this can then be used to give a time displacement graph, from launch location.
All the people on the net I have spoken to about rocketry GPS tend to use off the shelf devices, such as the GARMIN GPS12, and then interface to those.
Am I thinking about attempting the near impossible here ?