gps动态变形监测数据的多尺度分析-大地测量学与测量工程专业毕业论文.docx

硕士学位论文 Abstract
Abstract
Compared with traditional instruments,GPS has many advantages such as no weather condition and -sight limited. The most important advantage is that GPS can measure both the high 仔equency and quasi—static displacement of large engineering structure under abnormal loading conditions such as during wind and temperature GPS,has been increasingly used in structure health the GPS measurements include not only the real displacements of the structures,but also the quasi-system errors such as multipath and residual tropospheric order to filter the noise,mitigate the quasi—system errors and analyze the displacements,two multi—scale analysis methods, analysis and empirical mode position are used in using GPS dynamic defomation are the main contents of the thesis:
characters analyse of dynamic deformation monitoring using
includes non—linearity,non-plex periodicity
deformation,noises,system error and et a1.
basic theories of muti—scale analysis,wavelet transform and empirical mode continue wavelet transform, discrete wavelet transform and empirical mode position were
discussed the basic theories of muti-scale analysis were
discussed in detail.
multi—scale analysis method based on wavelet and its application in dynamic deformation includes denoising, data analysis in time—frequency domain,and extracting the properties
of the dynamic deformations.
multi-scale analysis method based on empirical mode
U
position and its appl ication in dynamic deformation experiments and real GPS data were analyzed using empirical mode corresponding results pared with the ones from wavelet method.
new method based on bination of wavelet and empirical mode position was method can e the disturb of noise using empirical mode position, reduce the boundary e