Abstract: A radio interferometry method is proposed to resolve the problems of the process of weak spacecraft signal received in deep space exploration. Firstly,based on the analysis of the original wavelet correlation filter,an improved one is proposed which contains shift correlation,the processing order from higher scale to lower one and the threshold filtering of the highest scale coefficients. Secondly,the wide band signal model in deep space exploration is analyzed and constructed,and the radio interferometry scheme based on wavelet correlation filter is provided. Finally,results of Monte Carlo simulation and data processing for some GEO satellite measured signal prove a better performance of the interferometry measurement,and the group delay accuracy of the GEO satellite is improved by 10%.