Simultaneous Synthetic Aperture Radar Imaging and Moving Target Indication

1
Simultaneous Synthetic Aperture Radar Imaging and
Moving Target Indication
PI Dr. Jim Stiles (jstiles_at_rsl.ku.edu) PhD
Student Geoff Akers, Major, USAF
(akersg_at_ittc.ku.edu)
Problem Statement
Planned Approach

• Develop 3D map of scene3rd D is radial velocity
• Multiple aperturesincreases number of
  observations while the number of unknowns remains
  the same
• Also allows Doppler ambiguities to be resolved
• Wide timewidthincreases Doppler resolution
• Wide bandwidthincreases Crosstrack resolution
• Apply general solution to single aperture radar
• Best possible solution
• Geolocation will likely have ambiguity
• The single aperture makes it difficult to
  unambiguously determine the targets true
  velocity

• Currently, SAR and MTI are performed on separate
  platforms
• SAR assumes objects in scene are stationary
• MTI treats stationary objects as clutter
• We desire to develop general
• solution for simultaneous and
• synergistic SAR/MTI

Tracking Via Keystoning, Dr. David Zasada,
2006, MITRE Corp
Important Issues
Project Impact

• SAR and MTI have different requirements
• SAR requires wide bandwidth for spatial
  resolution
• MTI requires wide timewidth to resolve target
  velocity
• MTI needs to scan large areas quickly
• Using SAR for MTI
• Space Time Adaptive Processing (STAP) for MTI
  requires an estimate of the data covariance
  matrix in data domain
• The variance is due to clutter
• Degraded-resolution SAR images estimate the
  clutter statistics in the target domain
• Wavelets could be used to iteratively increase
  the image resolution until targets can be
  identified

• Influence future designs of DoD radar
  architectures
• Moving toward the USAF goal of Provide
  persistent situation awareness by enabling
  timely intelligence of static and dynamic scene
• Enable current DoD SAR platforms to
  simultaneously perform limited MTI