中文摘要：

利用卫星导航实现多传感器列车组合定位必须建立数字轨道地图。在数字轨道测量数据处理过程中，轨道数据平顺性检查是非常重要的环节，而人工检查工作量大且无法保证数据准确可靠。本文使用短时傅里叶变换分析线路数据点夹角序列的幅度谱，通过对数据进行频域高通滤波排除线路弯道对平顺性检查的影响，从而直观的检查、定位线路中的数据不平顺区域。实验表明，该方法能够直观的呈现线路平顺性，并快速定位不平顺位置，在轨道地图 GPS测量过程中降低人员工作量，保证数据准确、可靠。

英文摘要：

In order to realize multi-sensor train positioning by use of satellite navigation,digital rail maps must be established.During processing of digital rail mapping data,inspection of rail data smoothness is an essential part,however,manual inspection requires a heavy workload and cannot ensure data accuracy and reliability. This paper made use of short-time Fourier transform （STFT）to analyze the amplitude spectra of include angle sequences of rail data points and to remove the influence of curved tracks on data smoothness inspection through high psss filtring.Therefore the rail sections with not smooth data were checked out and positioned visually.The experiment results illustrate as follows：The proposed method can demonstrate directly-riewd rail data smoothness and position the points area of unevenness rapidly;at the same time,the workload of GPS rail mapping can be reduced and the data can be ensured to be accurate and reliable.