Road network constraint trajectory generation method and system based on diffusion model

The invention provides a road network constraint trajectory generation method and system based on a diffusion model, and belongs to the field of intelligent traffic. The method comprises the following steps: firstly, collecting trajectory data in a road network, and representing the trajectory data as a road network constraint trajectory which is represented by adopting discrete type road sections and continuous type mobility in a mixed manner; preprocessing the road network constraint trajectory, and converting mixed representation into continuous representation in a vector form; a road network constraint trajectory generation model is constructed based on the diffusion model, the road network constraint trajectory generation model comprises a forward noise adding process and a reverse noise reduction process, and a noise reduction network used for fitting noise is obtained after training is completed; noise is randomly sampled from Gaussian noise and input into the trained road network constraint trajectory