Azimuth Phase Coding for Range Ambiguity Suppression in SAR

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A novel ambiguity suppression technique is proposed. Range ambiguities in synthetic aperture radar (SAR) images are eliminated with an azimuth filter after having applied an azimuth phase modulation to the transmitted pulses and a corresponding demodulation to the received pulses. The technique excels by actually eliminating the ambiguities rather than just defocusing them as most other techniques do. This makes the proposed technique applicable to distributed targets. The range ambiguity suppression permits the pulse repetition frequency (PRF) to exceed the upper limit otherwise defined by the antenna elevation dimension. The fundamental antenna area constraint still applies, but the PRF can be chosen with more freedom. In addition to ambiguity suppression, potential applications include nadir return elimination and signal-to-noise ratio improvement.
Original languageEnglish
Title of host publicationInternational Geoscience and Remote Sensing Symposium (IGARSS)
Publication date2004
ISBN (Print)0-7803-8742-2
Publication statusPublished - 2004
Event2004 IEEE International Geoscience and Remote Sensing Symposium - Anchorage, AK, United States
Duration: 20 Sep 200424 Sep 2004


Conference2004 IEEE International Geoscience and Remote Sensing Symposium
Country/TerritoryUnited States
CityAnchorage, AK
Internet address

Bibliographical note

Copyright: 2004 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE


  • modulation
  • SAR
  • nadir return
  • pulse repetition frequency
  • ambiguity
  • signal-to-noise ratio
  • filter


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