Abstract: The local correlation method requires more accurate DOR delay model，and the ambiguity is also more difficult to eliminate. This method has not been applied to Chinese deep space exploration yet. DOR geometric time delay algorithm was studied and validated by two ways. DOR geometric delay and DOR signals were simulated, and the local correlation method was used to get DOR delay measurement, which was different from the simulated true DOR delay in 0.2ps. CE-2 orbit data were also used to calculate VLBI geometric delay and DOR geometric delay. Transformation between the above two delays was demonstrated. The difference between VLBI delay transferred from DOR delay and the direct calculated VLBI  delay was under dozens of picosecond. The research results validate the exactitude of DOR geometric time delay algorithm and can be used in the Chinese Lunar, Mars and Venus deep-space exploration projects in the future.

Key words: Differential of one-way ranging, Geometric delay, Local correlation, Very long baseline interferometry, Deep-space exploration