An airborne synthetic aperture radar (SAR) experiment to support RADARSAT-2 ground moving target indication (GMTI)

نویسندگان

  • C. E. Livingstone
  • I. Sikaneta
  • C. H. Gierull
  • S. Chiu
  • A. Beaudoin
  • J. Campbell
  • J. Beaudoin
  • S. Gong
چکیده

As part of the preparatory work for the RADARSAT-2 moving object detection experiment (MODEX special operating mode), an airborne experiment was conducted at Canadian Forces Base Petawawa in July 1999 to study synthetic aperture radar (SAR) along-track interferometry (ATI) and SAR displaced phase centre antenna (DPCA) as candidate measurement techniques. The CV 580 SAR system operated by Environment Canada was configured as a two-aperture temporal interferometer, and data were collected over an experiment site that contained coordinated, global positioning system (GPS) monitored, moving targets. A robust ATI phase probability density function was identified and used in conjunction with a moving-target matched filter to extract and measure target motion. Corner reflector and vehicle velocities were measured for target speeds between 9 and 100 km/h to within 5% accuracy. SAR ATI and SAR DPCA performed equally well over this range of velocities, but ATI appears to be the more robust processing algorithm. Résumé. Dans le cadre de la phase préparatoire à l’expérience MODEX (moving object detection experiment, MODEX special operating mode) associée à RADARSAT-2, une expérience aéroportée a été réalisée à la Base canadienne de Petawawa, en juillet 1999, pour étudier le potentiel de l’interférométrie longitudinale RSO (ATI, along-track interferometry) et de la technique RSO de déplacement de phase de centre d’antenne (DPCA, displaced phase centre antenna) en tant que techniques de mesure privilégiés. Le système RSO CV 580 exploité par Environnement Canada a été configuré comme un interféromètre temporel à deux ouvertures et les données ont été acquises au-dessus d’un site expérimental contenant des cibles mobiles coordonnées et repérées par GPS. Une fonction robuste de densité de probabilité de phase ATI a été identifiée et utilisée en conjonction avec un filtre adapté aux cibles mobiles pour extraire et mesurer le mouvement de la cible. Un réflecteur trièdre et des vitesses des véhicules ont été mesurés pour des vitesses variant de 9 à 100 km/h avec une précision de 5% près. L’interférométrie longitudinale RSO et la technique DPCA RSO ont enregistré des performances semblables à travers l’ensemble des vitesses, mais l’interférométrie longitudinale semble constituer l’algorithme de traitement le plus robuste. [Traduit par la Rédaction]

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تاریخ انتشار 2003