以相关法为例,分别研究了仅有一个频率成分时和含部分相干成分时同源信号的TDE。发现相干干扰的幅值越大,TDE误差越大;当源信号和相干干扰信号的相位差在90°以内时,TDE误差随相位差的增加而增大;当相位差在90°~180°之间时,TDE误差的变化取决于源信号和干扰信号的幅值比。然而TDE误差均不超过相干成分的1/2周期。仿真结果验证了结论的正确性。

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.

此日志由 liming1217 在 2009-2-13 13:48:29 编缉过。