What does gps mean(what is gps)
Nowadays, people often go out by navigation. When we go to a place but don’t know the route, turn on the navigation, and the phone will automatically plan the route. Couriers use navigation to deliver meals, drivers use navigation to drive, and we use navigation to find unfamiliar places.
So, what is the principle of navigation? In order to achieve navigation, positioning is first required. Navigation refers to planning a route to guide us to our destination, and positioning refers to determining our location. The planned navigation route is meaningful only if the positioning is accurate. When it comes to how to locate a mobile phone, we have to mention the Global Positioning System.
The Global Positioning System (GPS) is a global satellite navigation and positioning system developed by the US government and military. It was built and put into use in 1994. The GPS system consists of three parts: air segment, ground segment and user segment. At the beginning of its completion, the space segment consisted of 24 satellites evenly distributed in 6 different orbital planes. The ground segment is the management center of the entire system, and the user segment is a variety of receivers that can receive signals from GPS satellites.
The GPS signal can give the position information of the satellite and the propagation time of the signal, and the distance can be measured by multiplying the two. Theoretically, an observation point can measure the distance to any three stars at the same time, and the position coordinates of the observation point can be solved by listing a ternary quadratic equation. It’s like drawing a ball, with each satellite as the origin and the measured distance as the radius. The intersection of two spheres forms a circle, and the intersection of three spheres forms a point. This point is our observation point.