Bidirectional SAR imaging mode

Josef Mittermayer*, Steffen Wollstadt, Pau Prats-Iraola, Paco Lopez-Dekker, Gerhard Krieger, Alberto Moreira

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

49 Citations (Scopus)


This paper introduces the bidirectional synthetic aperture radar (BiDi SAR) imaging mode, i.e., the simultaneous imaging of two directions by one antenna into one receiving channel, and presents short-term time series of images and interferograms acquired by the TerraSAR-X and TanDEM-X satellites. A comparison to alternative approaches for the acquisition of short-term time series is provided. The BiDi acquisition geometry is defined, and a TerraSAR-X BiDi antenna pattern is analyzed. BiDi raw data are simulated, sampled with different pulse repetition frequency values, and compared with real BiDi raw data. The spectral separation of simultaneously acquired forward-and backward-looking images is explained. This paper presents the image results of BiDi acquisitions with TerraSAR-X and TanDEM-X satellites flying with 20-km along-track separation. This pursuit configuration allowed for the acquisition of up to six short-term repeated images and up to three interferograms in a single pass. An overview of potential applications for the new BiDi SAR imaging mode concludes this paper.

Original languageEnglish
Article number6243203
Pages (from-to)601-614
Number of pages14
JournalIEEE Transactions on Geoscience and Remote Sensing
Issue number1
Publication statusPublished - 2013
Externally publishedYes


  • Bidirectional synthetic aperture radar (BiDi SAR)
  • TanDEM-X
  • TerraSAR-X


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