提高时延估计精度的方法研究

Methods of Improving Time delay Estimation Accuracy

该文在分析各种时延估计方法的优缺点的基础上，研究提高时延估计计算精度的方法。文中提出采用线性调频Ｚ变换的方法来提高时延估计的精度。结合采用广义互相关原理，采用线性调频Ｚ 变换对直升机声音信号进行了仿真计算，在有一定相关噪声的条件下，时延估计误差的方差可以达到５ μｓ 以内，优于其它的时延估计方法的计算结果。反映了该方法是一种较好的方法，具有实际意义。将该方法用于智能雷弹中，可以使雷弹对直升机的声定距误差控制在３０ ％ 以内。

Based on the analysis of the advantages and disadvantages of various time delay estimation,the ways to improve accuracy of time delay estimation is studied in this paper.One way of using Linear Convolution Transform (CZT) has been presented to improve the accuracy. The accuracy is also improved by using CZT.The simulation calculation was made as to sound signal from helicopter with CZT,combined with generalization correlation algorithms.The result shows that across error of the estimation will be less than 5μs, it is better than the results of other time delay estimation algorithms.The method proved to be more workable and it is of help in practice as well.Error for mine to position of the helicopter can be controlled less than 30% with this method.