中文摘要：

对国内外轨道不平顺谱作了简要的对比，并对实测轨道不平顺谱及其拟合谱的分析方法作了较为详细的介绍．首先说明了功率谱分析的必要性；然后就国内外不同的标准谱进行比较，再次，介绍了数据处理软件对功率谱的基本算法，并重点介绍了拟合谱的计算方法；最后，结合沪杭线的实例，利用该软件将实测数据拟合成功率谱，并与国内外现有的功率谱进行对比分析．

英文摘要：

The contrast between domestic and overseas power spectrum is presented in brief. The analysis method of power spectrum and its fitting method are introduced in detail in this paper. First, the necessity of power spectral analysis is illuminated. Second, comparison of different standard spectrums at home and abroad is carried out. Then, the basic algorithm for power spectrum, especially for fitting spectrum is illustrated. Finally, based on the investigation of Shanghai-Hangzhou Line, the fitted power spectrum is transformed from real data with this software, and then comparison is made between this fitted power spectrum and the existing power spectrums.