40 results about "Permanent scatterer" patented technology

The invention relates to a deformation monitoring method of a foundation SAR in a time decorrelation serious area. The method comprises the specific steps of S1 permanent scatterer point selection, S2 triangular mesh generation, S3 space-time three-dimensional phase position untwisting, S4 atmosphere phase compensation, S5 deformation inversion and S6 isolated PS point corresponding deformation quantity removal. The step S1 comprises the specific step that amplitude deviation screening, amplitude threshold screening and phase information screening are conducted respectively. By the adoption of the method, based on a traditional PS point selection amplitude deviation method, amplitude threshold screening and phase information screening are added so that PS points with higher quality can be extracted, and therefore deformation monitoring has higher accuracy.

The invention provides a correction method and apparatus for an atmospheric interference phase in a ground-based SAR. The method comprises S1, a ground-based SAR differential interferometer phase model is established; S2, filtering processing is carried out on the ground-based SAR differential interferometer phase model to filter a noise phase; S3, a high and permanent scattering body is screened from the ground-based SAR differential interferometer phase model with the filtered noise phase, wherein the high and permanent scattering body is a stable control point with a deformation phase being zero; S4, bidirectional curve fitting operation is carried out on the screened high and permanent scattering body to obtain a complete atmospheric interference phase, wherein the bidirectional curve fitting includes distance-to-curve fitting and direction-to-curve fitting; and S5, a deformation phase is obtained according to the ground-based SAR differential interferometer phase model obtained by the S1 and the atmospheric interference phase obtained by the S4. According to the invention, space-variant atmospheric interference phase correction is carried out by relying on the interferometer phase without the need to introduce any external auxiliary data; and the correction precision is high.

The invention discloses a PSI (Permanent Scatterer Interferometric) settlement monitoring result processing method on the basis of a high-speed rail structural body. According to the geometrical characteristics of the high-speed rail structural body and the settlement characteristics of a time-space domain of the high-speed rail structural body, PS (Permanent Scatterer) points on the high-speed rail structural body are subjected to comproportionation; the PSI settlement monitoring result processing method puts forward a measure of using an altitude correction value and a settlement slope value as indexes to carry out moving filtering and carrying out average processing on the local PS point stacking phenomenon; PS points with a large residual error on the high-speed rail structural body are removed; distribution of the PS points on the high-speed rail structural body is optimized; settlement monitoring accuracy of the high-speed rail structural body is improved. The PSI settlement monitoring result processing method comprises the following specific steps: extracting the PS points on the high-speed rail structural body; carrying out comproportionation on the PS points; applying the altitude correction values of the PS points to carry out moving filtering processing for the first time so as to remove the PS points with the abnormal altitude correction values; according to settlement rate values of the adjacent PS points, carrying out moving filtering processing for the second time so as to extract the abnormal PS points; processing the abnormal PS points; diluting the PS points which locally have the point stacking phenomenon by adopting an averaging method; respectively obtaining sequence settlement information at a random mileage point and in a random time period in the time-space domain. The PSI settlement monitoring result processing method effectively improves accuracy of a PSI settlement monitoring technology for settlement monitoring on the high-speed rail structural body.