And then , the esprit bearing estimation problem . is reformulated using fourth - order cumulant matrices instead of auto - correlation matrices . by doing so , the fourth - order cumulant matrices of additive colored gaussian noises can be suppressed 在此基础之上,将esprit方法扩展到四阶方法,用四阶累积量矩阵代替自相关矩阵,实现对加性有色高斯噪声的抑制,提高算法的估计精度。