Positioning accuracy under the condition of static and dynamic, and dynamic positioning effect is better than static positioning. The positioning of GPS tracker module by nominal parameter refers to the completely open sky, the satellite signal measured under the condition of fine.
So it is difficult to achieve in routine tests of nominal positioning time and location accuracy. The level of the common position precision description way has two kinds: one is? M CEP, the circular error probability, refers to the measured point has a 50% probability in a real coordinates as the center of the circle, to?
M for the radius of a circle; 2 it is? M 2 DRMS, namely double horizontal root mean square error, refers to the measured probability of about 95.5% is located in a real coordinates as the center of the circle, to? M for the radius of a circle.
The positioning accuracy of GPS trackers module depends on many aspects, such as from the GPS satellite clock difference and difference, the number of visible GPS satellites orbit and geometric distribution, solar radiation, atmosphere, multipath effect, etc.
In addition, the same GPS module, also because the antenna and feeder quality, position and direction, testing time, open skies range and direction, such as weather, PCB design causes different positioning error. Even if is the same GPS trackers module USES the same type of different antenna diversity is tested at the same time, the static drift quantity have difference.