1. The essence of GPS positioning is that the GSP receiver receives GPS signals and calculates its own longitude and latitude.
2. The set of points whose distance to a fixed point is equal to the fixed length is a circle in the plane, and a spherical surface in three-dimensional space; the set of points whose distance difference to two fixed points is a fixed length is a branch of a hyperbola in the plane, In the three-dimensional space is a surface of the hyperboloid.
3. The intersection of two hyperboloids is a circle, and the intersection of this circle and the third hyperboloid will get two points. One of these two points is equal to the radius of the earth, that is, on the surface of the earth.
4. It can be seen from the above that the key to Vehicle Gps Tracker positioning is how the GPS receiver obtains it: the distance to the two satellites is different.
5. The time of each GPS satellite is precisely synchronized (atomic clock).
6. All GPS satellites are sending a bit pattern (fixed bit stream) at the same time.
7. The GPS receiver of Vehicle Gps Tracker performs bit operations on the bit streams arriving by the two satellites (bit mode comparison), and obtains the time difference (number of bits) for the signals from the two satellites to reach the GPS receiver. Send all the time of 1 bit the transmission speed of the signal (the speed of light c), and get the distance difference between the Vehicle Gps Tracker and the two satellites.This is Working principle of Vehicle Gps Tracker.
