The precision of time delay estimation (TDE) will decline rapidly when coherent interference appears and it is a problem to eliminate the coherent disturbance from TDE for a long time.This paper worked on TDE in the cases of only one frequency and coherent components in the source based on the correlation TDE method. It is concluded that the TDE errors will enlarge when the amplitude of the coherent interference increase and TDE errors will enlarge with the increase of phase difference when the phase difference between the source and the disturbance is within 90°.TDE errors depend on the proportion of the amplitudes of the source to the disturbance when the phase difference ranges 90°-180°.However, all the TDE errors won’t exceed half a period of the coher-ent component.The computer simulations have verified the conclusions above.
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