Assessing the Impact of Positioning Errors in Car-Borne Repeat-Pass SAR Interferometry With a Controlled Rail-Based Experiment
Agile synthetic aperture radar (SAR) platforms such as car-borne and UAV-borne SAR systems require combined inertial navigation systems (INS) and global navigation satellite systems (GNSS) to measure the radar sensor trajectories used for focusing and interferometric processing. Measurement inaccura...
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| Format: | Article |
| Language: | English |
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IEEE
2022-01-01
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| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9839459/ |
| _version_ | 1811241986303197184 |
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| author | Roberto Coscione Irena Hajnsek Charles Werner Othmar Frey |
| author_facet | Roberto Coscione Irena Hajnsek Charles Werner Othmar Frey |
| author_sort | Roberto Coscione |
| collection | DOAJ |
| description | Agile synthetic aperture radar (SAR) platforms such as car-borne and UAV-borne SAR systems require combined inertial navigation systems (INS) and global navigation satellite systems (GNSS) to measure the radar sensor trajectories used for focusing and interferometric processing. Measurement inaccuracies from INS/GNSS systems lead to residual phase errors in the SAR products whose minimization is crucial to derive accurate topographic and deformation information. In this work, we analyze the impact of residual positioning errors on car-borne repeat-pass SAR interferometry at L-band for different INS/GNSS measurement configurations and for the typical car-borne acquisition geometry. The positioning errors are evaluated both during single SAR acquisitions with long integration times and between different acquisitions as a function of the distance of the radar platform from the GNSS reference stations. We show the reduction of interferometric phase errors achievable by additionally using a GNSS receiver mounted in the vicinity of the SAR platform as compared to remote reference stations of the national network of permanent GNSS receivers. Test results obtained in a controlled setup with a rail-based SAR system equipped with a navigation-grade INS/GNSS system show maximum repeat-pass trajectory errors on the order of 1–2 cm using a local GNSS reference station and up to 10–15 cm using the remote reference stations, leading to azimuth and range phase trends in the interferometric products. |
| first_indexed | 2024-04-12T13:44:18Z |
| format | Article |
| id | doaj.art-ea56a2e1bc4946b981dfaa1692118c53 |
| institution | Directory Open Access Journal |
| issn | 2151-1535 |
| language | English |
| last_indexed | 2024-04-12T13:44:18Z |
| publishDate | 2022-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| spelling | doaj.art-ea56a2e1bc4946b981dfaa1692118c532022-12-22T03:30:44ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing2151-15352022-01-01158402841510.1109/JSTARS.2022.31930539839459Assessing the Impact of Positioning Errors in Car-Borne Repeat-Pass SAR Interferometry With a Controlled Rail-Based ExperimentRoberto Coscione0https://orcid.org/0000-0003-2642-252XIrena Hajnsek1https://orcid.org/0000-0002-0926-3283Charles Werner2https://orcid.org/0000-0001-9043-0220Othmar Frey3https://orcid.org/0000-0003-1795-6087Department of Civil, Environmental and Geomatic Engineering, ETH Zürich, Zürich, SwitzerlandDepartment of Civil, Environmental and Geomatic Engineering, ETH Zürich, Zürich, SwitzerlandGAMMA Remote Sensing AG, Gümligen, SwitzerlandDepartment of Civil, Environmental and Geomatic Engineering, ETH Zürich, Zürich, SwitzerlandAgile synthetic aperture radar (SAR) platforms such as car-borne and UAV-borne SAR systems require combined inertial navigation systems (INS) and global navigation satellite systems (GNSS) to measure the radar sensor trajectories used for focusing and interferometric processing. Measurement inaccuracies from INS/GNSS systems lead to residual phase errors in the SAR products whose minimization is crucial to derive accurate topographic and deformation information. In this work, we analyze the impact of residual positioning errors on car-borne repeat-pass SAR interferometry at L-band for different INS/GNSS measurement configurations and for the typical car-borne acquisition geometry. The positioning errors are evaluated both during single SAR acquisitions with long integration times and between different acquisitions as a function of the distance of the radar platform from the GNSS reference stations. We show the reduction of interferometric phase errors achievable by additionally using a GNSS receiver mounted in the vicinity of the SAR platform as compared to remote reference stations of the national network of permanent GNSS receivers. Test results obtained in a controlled setup with a rail-based SAR system equipped with a navigation-grade INS/GNSS system show maximum repeat-pass trajectory errors on the order of 1–2 cm using a local GNSS reference station and up to 10–15 cm using the remote reference stations, leading to azimuth and range phase trends in the interferometric products.https://ieeexplore.ieee.org/document/9839459/Global navigation satellite systeminertial navigationmeasurement errorsradar remote sensingradar interferometrysynthetic aperture radar |
| spellingShingle | Roberto Coscione Irena Hajnsek Charles Werner Othmar Frey Assessing the Impact of Positioning Errors in Car-Borne Repeat-Pass SAR Interferometry With a Controlled Rail-Based Experiment IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Global navigation satellite system inertial navigation measurement errors radar remote sensing radar interferometry synthetic aperture radar |
| title | Assessing the Impact of Positioning Errors in Car-Borne Repeat-Pass SAR Interferometry With a Controlled Rail-Based Experiment |
| title_full | Assessing the Impact of Positioning Errors in Car-Borne Repeat-Pass SAR Interferometry With a Controlled Rail-Based Experiment |
| title_fullStr | Assessing the Impact of Positioning Errors in Car-Borne Repeat-Pass SAR Interferometry With a Controlled Rail-Based Experiment |
| title_full_unstemmed | Assessing the Impact of Positioning Errors in Car-Borne Repeat-Pass SAR Interferometry With a Controlled Rail-Based Experiment |
| title_short | Assessing the Impact of Positioning Errors in Car-Borne Repeat-Pass SAR Interferometry With a Controlled Rail-Based Experiment |
| title_sort | assessing the impact of positioning errors in car borne repeat pass sar interferometry with a controlled rail based experiment |
| topic | Global navigation satellite system inertial navigation measurement errors radar remote sensing radar interferometry synthetic aperture radar |
| url | https://ieeexplore.ieee.org/document/9839459/ |
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