基于频率补偿的时延估计方法

由于2个测量站的通道幅相不一致而导致送给时延估计器的两路信号的频率有差异,继而影响时延估计和系统定位精度。首先理论推导了频率差异是如何影响广义相关时延估计的,接着应用频域相关函数对频率差异做准确估计和补偿,最后给出了频差补偿后的时延估计方法。以4种常用通信信号为例,仿真验证了不同信噪比下所提出方法的正确性和有效性。

Method of Time Delay Estimation Based on Frequency Compensation

Because of the difference of gain and phase between two measuring station,the signal to Time Delay Estimation(TDE)has frequency difference,consequently,the precision of TDE and orientation are influenced.The theory is presented that the frequency difference is how to influence the General Cross Correlation(GCC).Then,the cross correlation in frequency is adopted to estimate and compensate the frequency difference.After the frequency difference is compensated,the method of TDE is presented.Computer simulation is done with four kinds of communication signal to validate that the presented method is right and effective.