How many satellites are needed for a fixed solution? Can a single satellite positioning system work?

Whether it can enter a fixed number of satellites is only one aspect, but it also depends on the signal quality of the received satellites, geometric factors of satellite distribution, satellite health status, multipath interference, and other factors.

In theory, a single system of four satellites with good observation quality can complete a fixed solution, but due to the lack of additional observations, the accuracy and reliability are poor. Generally speaking, at least 6-8 dual frequency observation satellites are required to calculate reliable high-precision fixed solutions. If the number of dual frequency satellite signals is small or the signal quality of the received satellite signals is poor, it will affect the performance of high-precision GNSS products.