Why GPS Tracker can not positing well indoor?
The GPS space uses a constellation of 24 satellites. The altitude of the satellite is about 20,200 kilometers. It is distributed on six orbital planes separated by six degrees of ascending interception. Four satellites are evenly distributed on each orbit, and two satellites are adjacent to each other. The satellites are separated by 40 degrees so that at least four satellites can be seen at any time on Earth. Traditional GPS positioning technology works well in the outdoors, but it is less effective in areas where indoor or satellite signals cannot cover, and if there are no more than three satellites above the location, the system cannot be positioned from a cold start state.