说明：  讨论了用MATLAB实现经典谱估计的各种方法，比较了它们的性能指标，并优选它们的参数.得出了在科学研究和工程技术应用中有一定参考价值的结论
(discussed using MATLAB classical spectrum estimation of various methods to compare their performance indicators, Optimization and their parameters. come in scientific research, engineering and technical applications can be useful to the conclusion)