基于小波去噪和三阶全息图的时延估计算法

摘要

传统基于二阶矩的时延估计算法均是在假设噪声为高斯白噪声且相互独立的基础上进行研究，而实际外层空间中的噪声要复杂得多，有可能是非高斯或者相关的，而此时，基于二阶矩的时延估计算法性能会急剧下降，将无法准确地进行时延估计。为解决这一问题，提出了一种基于小波阈值去噪和三阶全息图的时延估计新算法，可以在相关噪声和更低的信噪比条件下获得较为精确的时延估计，仿真实验表明了该新算法的可行性。%Traditional time delay estimation algorithms of the second order are mostly in the condition of Gaussian white noise, with the signal and noise independent, but the actual noise in outer space is much more complex, likely is related or not Gaussian, in the condition, the time delay estimation algorithms of the second order will not be able to obtain the accu⁃rate time delay estimation. To solve the question, the time delay estimation algorithm based on the wavelet denoising and three order hologram is proposed, it can obtain more accurate time delay estimation in related or not Gaussian noise condi⁃tion, simulation results prove the feasibility of the new algorithm.