The GNSS receiver adopts an integrated design, integrating GNSS receiver, wired communication 2G/3G/4G wireless communication, etc. It can perform single system positioning or multi system joint positioning. With the continuous improvement of the reliability and practicality of China's Beidou 3rd generation satellite launch system, especially in harsh environments, the joint application of Beidou+GPS has increased the number of tracking satellites and improved the availability and reliability of GNSS high-precision positioning, making positioning applications in high occlusion areas possible.