A ground-based SAR atmospheric interference phase correction method and device
An atmospheric interference and phase correction technology, which is applied in infrastructure engineering, infrastructure testing, image enhancement, etc., can solve the problems of under-correction of atmospheric interference phase and azimuth, and the correction effect is not very ideal, and achieves strong adaptability and robustness. awesome effect
An atmospheric interference and phase correction technology, which is applied in infrastructure engineering, infrastructure testing, image enhancement, etc., can solve the problems of under-correction of atmospheric interference phase and azimuth, and the correction effect is not very ideal, and achieves strong adaptability and robustness. awesome effect
CN105678716BActive Publication Date: 2018-09-18INNER MONGOLIA UNIV OF TECH
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[0054] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
[0055] Such as figure 1 As shown, the flow chart of a ground-based SAR atmospheric interference phase correction method according to the embodiment of the present invention, the method considers the spatial variation characteristics of the atmospheric interference phase, introduces the concept of strong permanent scatterers, and uses the correlation coefficient, amplitude dispersion Exponential and phase space consistency three-level threshold method screens stable control points whose deformation phase value is approximately zero, and then performs phase interpolation and fitting, without introducing external auxiliary data, relying on the interferometric phase itself for space-varying atmospheric interference phase correction. Specifically, the following steps are included:
[0056...
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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.
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technical field [0001] The invention relates to the field of ground-based SAR interferometry, in particular to a ground-based SAR atmospheric interference phase correction method and device. Background technique [0002] Atmospheric interference is caused by the different phase delays caused by the atmospheric pressure, temperature, and humidity changing in time and space due to the radar electromagnetic wave signal passing through the atmosphere during propagation. Atmospheric interference seriously affects the accuracy and reliability of radar interferometry deformation inversion, and has always been one of the important factors hindering the development of InSAR interferometry applications. The existing InSAR atmospheric interference phase correction methods are mainly divided into two categories: (1) based on external auxiliary data and (2) based on the interferometric phase itself. Methods based on external auxiliary data mainly include modeling based on surface meteor...
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Patent Timeline
18 Sep 2018
Publication
CN105678716B
- IPC
- G06T5/00; E02D33/00
- CPC
- E02D33/00; G06T5/002; G06T5/006; G06T2207/20032; G06T2207/30184
- Inventors
- 黄平平; è°ç»´è´¤