Abstract: In order to improve the efficiency of radio interference source troubleshooting in the terminal area of the airport, combined with the current interference source troubleshooting methods, a three-dimensional air ground collaborative cross location model is established on the basis of the direction finding cross location principle in this paper. And the positioning error of the model is analyzed and simulated. The simulation results show that the air ground collaborative cross location accuracy is higher than the traditional ground bistatic positioning accuracy, and the positioning error is decreased by 17. 9?? at 20 km. By analyzing the autocorrelation of weak periodic signals, taking the opportunity of Mianyang Nanjiao Airport radio interference source troubleshooting, the space ground cooperative radio interference source location method is adopted, and the autocorrelation small signal detection algorithm is used to improve the signal-to-noise ratio of interference signals, which verifies the feasibility of this model for GNSS signal interference source location.