一种水下高速小目标回波频率估计方法

针对拦截水下高速小目标时近场区体目标效应对多普勒频率估计的影响，本文设计了一种选择区间加权频率估计方法，该算法将近场区时高速小目标看成体目标进行处理，通过对频率估计分量进行选择性幅度加权平均，降低了频率估计误差，减少了由于目标姿态变化对频率估计稳定性产生的不良影响。经仿真研究，与直接进行频率估计相比较，该方法能够较好的抑制体目标效应对多普勒频率估计造成的影响。在最不利情况下，频率估计误差数值低于300Hz，较好地满足了声引信利用多普勒频率进行后续参数估计的要求。

The echo Frequency Estimation method of underwater high speed target

The body target affects on doppler frequency estimation when they are near-field. Aiming at the effect, an optimal weighted frequency estimation method is proposed. The method can decrease estimation error and the effect on estimation stability by optimal weighted frequency. The simulation results show that compared with direct frequency estimation, the method can depress the effect of body target effectively. The error of frequency estimation is less than 300Hz under the worst case. It can meet the requirement which estimates acoustic fuse parameter by using of doppler frequency .