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Azimuth Full-Aperture Processing of Spaceborne Squint SAR Data with Block Varying PRF.

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  • معلومة اضافية
    • المصدر:
      Publisher: MDPI Country of Publication: Switzerland NLM ID: 101204366 Publication Model: Electronic Cited Medium: Internet ISSN: 1424-8220 (Electronic) Linking ISSN: 14248220 NLM ISO Abbreviation: Sensors (Basel) Subsets: PubMed not MEDLINE; MEDLINE
    • بيانات النشر:
      Original Publication: Basel, Switzerland : MDPI, c2000-
    • الموضوع:
      Radar* ; Algorithms*; Cell Movement ; Computer Simulation ; Diffusion Magnetic Resonance Imaging
    • نبذة مختصرة :
      The block varying pulse repetition frequency (BV-PRF) scheme applied to spaceborne squint sliding-spotlight synthetic aperture radar (SAR) can resolve large-range cell migration (RCM) and reduce azimuth signal non-uniformity. However, in the BV-PRF scheme, different raw data blocks have different PRFs, and the raw data in each block are insufficiently sampled. To resolve the two problems, a novel azimuth full-aperture pre-processing method is proposed to handle the SAR raw data formed by the BV-PRF scheme. The key point of the approach is the resampling of block data with different PRFs and the continuous splicing of azimuth data. The method mainly consists of four parts: de-skewing, resampling, azimuth continuous combination, and Doppler history recovery. After de-skewing, the raw data with different PRFs can be resampled individually to obtain a uniform azimuth sampling interval, and an appropriate azimuth time shift is introduced to ensure the continuous combination of the azimuth signal. Consequently, the resulting raw data are sufficiently and uniformly sampled in azimuth, which could be well handled by classical SAR-focusing algorithms. Simulation results on point targets validate the proposed azimuth pre-processing approach. Furthermore, compared with methods to process SAR data with continuous PRF, the proposed method is more effective.
    • References:
      Sensors (Basel). 2018 Feb 03;18(2):. (PMID: 29401680)
      Sensors (Basel). 2018 Mar 12;18(3):. (PMID: 29534551)
      Sensors (Basel). 2021 Apr 01;21(7):. (PMID: 33916313)
      Sensors (Basel). 2015 Feb 05;15(2):3750-65. (PMID: 25664433)
      Sensors (Basel). 2019 Jan 18;19(2):. (PMID: 30669345)
      Sensors (Basel). 2017 Jul 25;17(8):. (PMID: 28757547)
    • Grant Information:
      62071258 National Natural Science Foundation of China; 61971246 National Natural Science Foundation of China; 2020ZD18 Natural Science Foundation of Inner Mongolia; 2021MS06004 Natural Science Foundation of Inner Mongolia; 2021MS06005 Natural Science Foundation of Inner Mongolia; 2020GG0073 Science and Technology Planning Project of Inner Mongolia
    • Contributed Indexing:
      Keywords: azimuth data reconstruction; azimuth resampling; pulse repetition frequency (BV-PRF); squint sliding spotlight; synthetic aperture radar (SAR)
    • الموضوع:
      Date Created: 20221211 Date Completed: 20221216 Latest Revision: 20221221
    • الموضوع:
      20240829
    • الرقم المعرف:
      PMC9737868
    • الرقم المعرف:
      10.3390/s22239328
    • الرقم المعرف:
      36502030