Satellite-ground communication switching and routing method based on digital twinning

The invention discloses a satellite-ground communication switching and routing method based on digital twinning, and aims to ensure better communication by reducing satellite-ground switching frequency and improving inter-satellite content delivery efficiency in a user request communication process. According to the method, firstly, a satellite toolkit is used for building a scene and obtaining satellite data, digital twinning of a physical network is constructed based on the scene and the satellite data, then a satellite candidate set and an optimal candidate replacement service satellite are obtained by using the data, and finally, an optimal routing path is found in all potential paths by using two indexes of propagation time delay and content delivery rate. According to the method, the switching frequency can be effectively reduced, the communication becomes more continuous, meanwhile, the optimal routing path is selected by building the inter-satellite topology and digital twinning, and the inter-satelli