Encyclopedia of Earthquake Engineering

2015 Edition
| Editors: Michael Beer, Ioannis A. Kougioumtzoglou, Edoardo Patelli, Siu-Kui Au

SAR Images, Interpretation of

  • Antonio IodiceEmail author
  • Daniele Riccio
Reference work entry
DOI: https://doi.org/10.1007/978-3-642-35344-4_219

Introduction

A synthetic aperture radar (SAR) is a remote sensing microwave imaging system which consists of a radar sensor mounted on a moving platform, such as an airplane or a satellite. As the platform flies along an approximately straight line, the radar emits microwave pulses at fixed rate (pulse repetition frequency (PRF)) and receives corresponding returns (echoes) backscattered by the illuminated scene. A SAR is able to distinguish points at different distances from the line of flight based on different delays of their returns; in addition, points at different positions along a direction parallel to the line of flight are distinguished by forming a very long (and therefore very directive, with a very narrow beam) synthetic array. This is obtained by properly combining pulses received by the sensor at different positions along the line of flight, so that the synthetic array length is equal to the length of the portion of line of flight such that a given ground point remains...

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Dipartimento di Ingegneria Elettrica e delle Tecnologie dell’InformazioneUniversità degli Studi di Napoli Federico IINapoliItaly