Introduction - If you have any usage issues, please Google them yourself
GPS positioning called planetesimals selection process, based on the contribution of each satellite GDOP value of the selected size of stars, which are divided into the selection of satellite delivery, and direct elections stars. Taking into account the motor vehicle storage space constraints, the election of four stars, or 6. The six satellites, GDOP value is closer to the value of all the satellites, and the computation amount.