Polarimetric Channel Misregistration Evaluation for the GaoFen-3 QPSI Mode

Lei Shi, Pingxiang Li, Jie Yang, Liangpei Zhang, Xiaoli Ding, Lingli Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

This letter presents two main contributions to the data quality assessment of China's new GaoFen-3 radar satellite. First, we observed a half-pixel misregistration between the horizontal (H) and vertical (V) transmitting channels in the azimuth direction. This was determined by investigating the corner reflector (CR) response of some stripmap products of GaoFen-3 quad-pol stripmap (QPSI) mode. Second, to check whether the azimuth misregistration exists in different beams of QPSI mode, we improved the RADARSAT-2 channel checking method as a tool and evaluated more than 300 stripmap scenes. This letter confirms that the half-pixel misregistration problem, which can cause about 10% decoherence in the co-pol and cross-pol channel correlation coefficients, is common in the GaoFen-3 stripmap products of QPSI mode. Furthermore, the improved method can be considered as an effective way to fix the misregistration problem.

Original languageEnglish
Article number8531786
Pages (from-to)544-548
Number of pages5
JournalIEEE Geoscience and Remote Sensing Letters
Volume16
Issue number4
DOIs
Publication statusPublished - Apr 2019

Keywords

  • Azimuth misregistration
  • GaoFen-3
  • polarimetric

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Electrical and Electronic Engineering

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