Vehicle gps tracker for car

We know that the satellites are in the right orbit. The correct trajectory is programmed into an ephemeris, injected into the satellite, and sent to the GPS locator via satellite. By correctly receiving the ephemeris of each satellite, the exact position of the satellite can be ascertained. The GPS system has a very precise atomic clock on each satellite and is constantly calibrated by the monitoring station. The satellite sends navigation information and also sends precise time information. The GPS locator receives this information and synchronizes it with its own clock to get the exact time. Therefore, in addition to accurate positioning, GPS locators can generate accurate time information. Since the position of the satellite is accurate, in the GPS observation, we can get the distance from the satellite to the receiver. Using the distance formula in the three-dimensional coordinates, using three satellites, we can form three equations and solve the position of the obs...