3-D positioning and target association for medium resolution SAR sensors

Prabu Dheenathayalan, David Small, Ramon Hanssen

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)
190 Downloads (Pure)


Associating a radar scatterer to a physical object is crucial for the correct interpretation of interferometric synthetic aperture radar measurements. Yet, especially for medium-resolution imagery, this is notoriously difficult and dependent on the accurate 3-D positioning of the scatterers. Here, we investigate the 3-D positioning capabilities of ENVISAT medium-resolution data. We find that the data are perturbed by range-and-epoch-dependent timing errors and calibration offsets. Calibration offsets are estimated to be about 1.58 m in azimuth and 2.84 m in range and should be added to ASAR products to improve geometric calibration. The timing errors involve a bistatic offset, atmospheric path delay, solid earth tides, and local oscillator drift. This way, we achieve an unbiased positioning capability in 2-D, while in 3-D, a scatterer was located at a distance of 28 cm from the true location. 3-D precision is now expressed as an error ellipsoid in local coordinates. Using the Bhattacharyya metric, we associate radar scatterers to real-world objects. Interpreting deformation of individual infrastructure is shown to be feasible for this type of medium-resolution data.
Original languageEnglish
Pages (from-to)6841-6853
Number of pages13
JournalIEEE Transactions on Geoscience and Remote Sensing
Issue number11
Publication statusPublished - 2018


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