GPS positioning principle?

GPS positioning principle?

GPS, the full name of which is Global Positioning System, plays a key role in our daily life with its precise positioning ability. It achieves high-precision positioning through a group of artificial earth satellites by radio navigation.

Pseudo-range measurement and single-point positioning: The first step of GPS positioning is to use the ranging code signal transmitted by the satellite. The receiver measures its arrival time and calculates the distance between the satellite and the receiver by the speed of light. This is the so-called pseudo-range single-point positioning. Carrier phase positioning: Compared with pseudo-range, carrier phase positioning is more accurate. It directly measures the phase difference of the signal and can provide more subtle location information to ensure the accuracy of navigation. Real-time differential positioning: In some cases, GPS receivers can receive data from multiple satellites. Through real-time differential technology, the positioning accuracy can be further improved, and a stable positioning effect can be maintained even in an environment of multi-path propagation and multi-satellite interference.

Satellites not only provide navigation data, but also contain the satellite's own location information and signal transmission time through navigation messages. Each satellite transmits this data in the form of a 1500-bit logical frame. The transmission time of the entire frame takes 30 seconds to ensure that the receiver can perform accurate calculations after receiving the signal.

The charm and limitations of mobile phone positioning

GPS positioning has been widely used in smart phones. The built-in GPS hardware of the mobile phone communicates directly with satellites to obtain latitude and longitude information, and the positioning accuracy is extremely high. However, GPS positioning is not impeccable. It relies on satellite signals, so the positioning performance may be limited indoors or when the signal is blocked.

GPS positioning brings us real-time, high-precision positioning services through clever radio technology and satellite collaboration. Although there are some limitations, it is undoubtedly an important navigation tool in our modern life.

The above is the principle of GPS positioning? Introduction, Zhehan Technology specializes in the production of vehicle GPS positioning systems, elderly GPS positioning systems, children GPS positioning systems, pet GPS positioning systems, those who need positioning systems can consult our company;