In the dual comb interference process of bidirectional time-frequency transmission experiment, the waveform and spectrum of the interference signal change due to factors such as link dispersion and Doppler Effect, this will cause interference on key indicators such as clock deviation and frequency transmission accuracy. In response to the data simulation requirements of this experiment in a free space environment, the basic principles of comb pulse interference, link dispersion effect, and Doppler effect, as well as the functional composition of the simulation model, are studied. As a result, interference data is simulated and the peak data is captured on the C++ platform. The research results indicate that the model has a high degree of matching and a fast-processing speed, which in turn can provide a useful reference and assistance for subsequent practical experiments.