The signal CBTC system, onboard CCTV system, and onboard PIS system can effectively realize their business functions. The vehicle-ground wireless communication system is a key link. This achievement uses waveguides as the transmission medium for vehicle-ground communication, which can truly meet the system's requirements for high bandwidth, low latency, strong anti-interference capability, and good stability. Especially in outdoor elevated and maglev sections with extremely complex electromagnetic environments, the application of waveguides in the vehicle-ground communication system provides an excellent solution for the vehicle-ground communication of signal systems and communication systems under complex electromagnetic environments. The vehicle-ground wireless communication system adopts a 5GHz frequency band split waveguide method to achieve wireless data transmission between onboard equipment and trackside equipment. That is, the ground is laid with a trackside integrated cabinet and split waveguide antennas, while the vehicle body is equipped with an onboard receiving antenna and an onboard RF module. The vehicle-mounted WGB uses a crack waveguide to transmit and receive wireless signals between the antenna on board and the ground, forming a wireless information transmission system between the vehicle and the ground. The radiated signal is uniform and stable, with minimal loss over long distances, and the system has good compatibility and anti-interference performance. The bidirectional coverage of the vehicle-ground communication system can reach 400 meters, effectively solving the problem of large spatial attenuation at 5GHz frequency and short coverage distance. Both the ground and vehicle RF modules are bidirectional devices, which can effectively suppress out-of-band interference, and the ground module can improve channel isolation; by using dual networks, it is possible to increase capacity by transmitting two signals within the waveguide.