A New Permanent Scatterer Selection Method Based on Gaussian Mixture Model for Micro-Deformation Monitoring Radar Images
The micro-deformation monitoring radar is usually based on Permanent Scatterer (PS) technology to realize deformation inversion. When the region is continuously monitored for a long time, the radar image amplitude and pixel variance will change significantly with time. Therefore, it is difficult to...
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MDPI AG
2024-03-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/24/6/1809 |
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| author | Weixian Tan Jing Li Ting Hou Pingping Huang Yaolong Qi Wei Xu Chunming Li Yuejuan Chen |
| author_facet | Weixian Tan Jing Li Ting Hou Pingping Huang Yaolong Qi Wei Xu Chunming Li Yuejuan Chen |
| author_sort | Weixian Tan |
| collection | DOAJ |
| description | The micro-deformation monitoring radar is usually based on Permanent Scatterer (PS) technology to realize deformation inversion. When the region is continuously monitored for a long time, the radar image amplitude and pixel variance will change significantly with time. Therefore, it is difficult to select phase-stable scatterers by conventional amplitude deviation methods, as they can seriously affect the accuracy of deformation inversion. For different regions studied within the same scenario, using a PS selection method based on the same threshold often increases the size of the deformation error. Therefore, this paper proposes a new PS selection method based on the Gaussian Mixture Model (GMM). Firstly, PS candidates (PSCs) are selected based on the pixels’ amplitude information. Then, the amplitude deviation index of each PSC is calculated, and each pixel’s probability values in different Gaussian distributions are acquired through iterations. Subsequently, the cluster types of pixels with larger probability values are designated as low-amplitude deviation pixels. Finally, the coherence coefficient and phase stability of low-amplitude deviation pixels are calculated. By comparing the probability values of each of the pixels in different Gaussian distributions, the cluster type with the larger probability, such as high-coherence pixels and high-phase stability pixels, is selected and designated as the final PS. Our analysis of the measured data revealed that the proposed method not only increased the number of PSs in the group, but also improved the stability of the number of PSs between groups. |
| first_indexed | 2024-04-24T17:50:37Z |
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| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-24T17:50:37Z |
| publishDate | 2024-03-01 |
| publisher | MDPI AG |
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| series | Sensors |
| spelling | doaj.art-7d80fb5b3f3a4c5a9f191d7da1df37c52024-03-27T14:03:50ZengMDPI AGSensors1424-82202024-03-01246180910.3390/s24061809A New Permanent Scatterer Selection Method Based on Gaussian Mixture Model for Micro-Deformation Monitoring Radar ImagesWeixian Tan0Jing Li1Ting Hou2Pingping Huang3Yaolong Qi4Wei Xu5Chunming Li6Yuejuan Chen7College of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaThe micro-deformation monitoring radar is usually based on Permanent Scatterer (PS) technology to realize deformation inversion. When the region is continuously monitored for a long time, the radar image amplitude and pixel variance will change significantly with time. Therefore, it is difficult to select phase-stable scatterers by conventional amplitude deviation methods, as they can seriously affect the accuracy of deformation inversion. For different regions studied within the same scenario, using a PS selection method based on the same threshold often increases the size of the deformation error. Therefore, this paper proposes a new PS selection method based on the Gaussian Mixture Model (GMM). Firstly, PS candidates (PSCs) are selected based on the pixels’ amplitude information. Then, the amplitude deviation index of each PSC is calculated, and each pixel’s probability values in different Gaussian distributions are acquired through iterations. Subsequently, the cluster types of pixels with larger probability values are designated as low-amplitude deviation pixels. Finally, the coherence coefficient and phase stability of low-amplitude deviation pixels are calculated. By comparing the probability values of each of the pixels in different Gaussian distributions, the cluster type with the larger probability, such as high-coherence pixels and high-phase stability pixels, is selected and designated as the final PS. Our analysis of the measured data revealed that the proposed method not only increased the number of PSs in the group, but also improved the stability of the number of PSs between groups.https://www.mdpi.com/1424-8220/24/6/1809micro-deformation monitoring radarpermanent scattererGMMamplitude deviation |
| spellingShingle | Weixian Tan Jing Li Ting Hou Pingping Huang Yaolong Qi Wei Xu Chunming Li Yuejuan Chen A New Permanent Scatterer Selection Method Based on Gaussian Mixture Model for Micro-Deformation Monitoring Radar Images Sensors micro-deformation monitoring radar permanent scatterer GMM amplitude deviation |
| title | A New Permanent Scatterer Selection Method Based on Gaussian Mixture Model for Micro-Deformation Monitoring Radar Images |
| title_full | A New Permanent Scatterer Selection Method Based on Gaussian Mixture Model for Micro-Deformation Monitoring Radar Images |
| title_fullStr | A New Permanent Scatterer Selection Method Based on Gaussian Mixture Model for Micro-Deformation Monitoring Radar Images |
| title_full_unstemmed | A New Permanent Scatterer Selection Method Based on Gaussian Mixture Model for Micro-Deformation Monitoring Radar Images |
| title_short | A New Permanent Scatterer Selection Method Based on Gaussian Mixture Model for Micro-Deformation Monitoring Radar Images |
| title_sort | new permanent scatterer selection method based on gaussian mixture model for micro deformation monitoring radar images |
| topic | micro-deformation monitoring radar permanent scatterer GMM amplitude deviation |
| url | https://www.mdpi.com/1424-8220/24/6/1809 |
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