【摘要】 介绍了各种经典功率谱估计方法,不仅从理论上对各种方法的谱估计质量进行了分析比较,而且通过Matlab实验仿真验证了理论分析的正确性。着重对使用比较广泛的Welch法进行了深入的研究,给出了窗函数选择的一般要求,通过仿真分析了不同的窗函数对Welch法谱估计质量的影响,比较了他们的优缺点。最后分析了采样点数较少即短数据对Welch法谱估计质量的影响。更多还原

【Abstract】 Various classical Power Spectrum Density(PSD) estimation methods are introduced,estimation quality of each method is analyzed and compared in both theory and simulation using the software Matlab.Then further study is made in Welch method which is used most widely.General selecting criterion of window function is presented and estimation quality of Welch method using different window function is compared.Finally,the impact of fewer data on estimation quality of Welch method is analyzed.更多还原