Start Lectures SAR and Moving Target Indication
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Lecturer: Dr. Christoph Gierull (DRDC / Canada)

 

The purpose of this lecture is to introduce the participants to aspects of synthetic aperture radar (SAR) in conjunction with moving target indication (MTI).

Synthetic aperture radar provides high-resolution images of the non-moving ground scene, but fails to indicate and position moving objects. A short review of the motion- induced effects occurring in SAR images will open this lecture. Like in special airborne MTI systems, the solution to the SAR MTI problem is to use an array of antennas or subapertures and several receiving channels to cancel the interfering clutter. Popular methods for the recognition of motion are ATI (Along Track Interferometry) and DPCA (Displaced phased centre Antenna) applied to a pair of phase centres. ATI yields image-like interferograms with high information content but fails for instance for the azimuth re-positioning of moving target signals interfered by clutter. In contrast, DPCA commonly permits sufficient clutter suppression but also prevents an accurate repositioning of the moving object in the SAR image. An efficient generalization of DPCA is adaptive space-time processing (STAP), which can be simplified to frequency- dependent spatial processing in the Doppler domain.

The ATI, DPCA and STAP techniques applied to SAR will be reviewed in this lecture, theoretically analysed and their performance will be illustrated with data gathered by experimental airborne and space based SAR systems, such as PAMIR and RADARSAT-2.

The learning modules are in detail:

  • Stationary world SAR
    • Principle Processing
  • SAR & Moving Targets (single channel)
    • Geometry
    • Characteristic
  • SAR & Moving Targets (multi channel)
    • Different approaches
    • Channel balancing
  • Space-based SAR/GMTI
    • Comparision airborne/space-borne
    • DPCA
    • Examples
Last Updated on Wednesday, 28 September 2016 11:41