In recent years, anti-interference technology of Global Navigation Satellite System(GNSS) has gradually become a research hotspot. In anti-interference research, satellite navigation signal simulation on array antennas in the context of broadband interference plays a vital role. In order to improve the efficiency of anti-interference research, the simulation problem of digital Intermediate Frequency(IF) signal at the entrance of satellite navigation software receiver is studied by Matlab. Firstly, power control is performed according to the signal to interference and noise ratio. Then satellite navigation signals, interference signals and noise signals are modeled separately. And then the delay caused by the array antenna is calculated. Finally, the satellite signals of the array antenna in the background of broadband interference are simulated and the Graphical User Interface(GUI) is designed. After the simulation, the signal is input into the research system of the anti-interference algorithm. It implements the complex interference signal source simulation in anti-interference research, improves its efficiency and verifies its practicability and correctness.