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YAPAY AÇIKLIKLI RADAR VE SONAR GÖRÜNTÜLEME İÇİN YENİ BİR LİNEER OLMAYAN SIKLIK DEĞİŞİMLİ SİNYAL

Year 2015, Volume 11, Issue 1, 68 - 81, 20.01.2016

Abstract

Radar ve sonar sinyal işlemede ortalama güç seviyeleriyle birlikte yüksek çözünürlüğü sağlayabilmek için evre-kodlu sinyaller kullanılmaktadır. En sıkça kullanılan sinyallarden biri de lineer sıklık değişimli (linear frequency modulated-LFM) sinyaldir. Lineer sıklık değişimli sinyale alternatif olarak bazı lineer olmayan sıklık değişimli sinyaller de ortaya atılmıştır. Bu çalışmada yeni bir lineer olmayan sıklık değişimli sinyal önerilmiştir. Ortaya atılan sinyalin; bant aralığı, nokta dağılım fonksiyonu ve Fourier dönüşümü gibi özellikleri sunulmuştur. Lineer sıklık değişimli sinyal ve önerilen lineer olmayan sıklık değişimli sinyal kullanılarak kutupsal format ve Stolt format işleme teknikleriyle sentetik görüntüler oluşturulmuş ve ortaya atılan sinyalin sonar görüntü çözünürlüğünü geliştirdiği gösterilmiştir.

References

  • A. W. Doerry, “Generating precision nonlinear FM chirp waveforms,” Proc. SPIE , 65470D, 2007.
  • C. Bayındır, “Enhancements to synthetic aperture radar chirp waveforms and non- coherent SAR change detection following large scale disasters,” Ph.D. dissertation, Georgia Institute of Technology, GA, 2013.
  • A. Hein, Processing of SAR Data: Fundamentals, Signal Processing, Interferometry. Berlin, Germany: Springer-Verlag, 2004.
  • M. Soumekh, Synthetic Aperture Radar Signal Processing with MATLAB Algorithms. New York: John Wiley and Sons, 1999.
  • M. Soumekh, Fourier Array Imaging. Englewood Cliffs, New Jersey: Prentice Hall, Collins, T. and Atkins, P., “Nonlinear frequency modulation chirps for active sonar,” IEEE Proceedings on Radar, Sonar and Navigation, vol. 146, no. 6, pp. 312-316, W. Carrara, R. Goodman and R. Majewski, Spotlight Synthetic Aperture Radar Signal Processing Algorithms. Norwood, Massachusetts: Artech House, 1995.
  • R. H. Stolt, “Migration by Fourier Transform,” Geophysics., vol. 43, no. 1, pp. 23–48, C. Bayındır, “Denizlerdeki petrol kirliliğinin sentetik açıklıklı radar görüntüleri değişim saptama yöntemleriyle tespiti,” 8. Kıyı Mühendisliği Sempozyumu, pp. 907- , İstanbul, 2014. (In Turkish)

A NOVEL NONLINEAR FREQUENCY MODULATED CHIRP SIGNAL FOR SYNTHETIC APERTURE RADAR AND SONAR IMAGING

Year 2015, Volume 11, Issue 1, 68 - 81, 20.01.2016

Abstract

In order to maintain average power levels as well as high range resolution, phasecoded signals are used in radar and sonar signal processing. One of the most commonly used phase-coded signals is the linear frequency modulated chirp waveform. Various nonlinear frequency-modulated chirps are offered as alternatives to linear frequency modulated chirp. In this paper a new nonlinear frequency modulated chirp waveform is proposed. Properties like bandwidths, point spread functions and Fourier transforms are given for the proposed chirp signal. Synthetic imagery for spotlight imaging geometry is reconstructed by using the polar format and Stolt format processing techniques using the linear frequency-modulated (LFM) and proposed nonlinear frequency modulated chirp. Comparisons are presented, and it is shown that proposed waveform can improve the sonar image resolution.

References

  • A. W. Doerry, “Generating precision nonlinear FM chirp waveforms,” Proc. SPIE , 65470D, 2007.
  • C. Bayındır, “Enhancements to synthetic aperture radar chirp waveforms and non- coherent SAR change detection following large scale disasters,” Ph.D. dissertation, Georgia Institute of Technology, GA, 2013.
  • A. Hein, Processing of SAR Data: Fundamentals, Signal Processing, Interferometry. Berlin, Germany: Springer-Verlag, 2004.
  • M. Soumekh, Synthetic Aperture Radar Signal Processing with MATLAB Algorithms. New York: John Wiley and Sons, 1999.
  • M. Soumekh, Fourier Array Imaging. Englewood Cliffs, New Jersey: Prentice Hall, Collins, T. and Atkins, P., “Nonlinear frequency modulation chirps for active sonar,” IEEE Proceedings on Radar, Sonar and Navigation, vol. 146, no. 6, pp. 312-316, W. Carrara, R. Goodman and R. Majewski, Spotlight Synthetic Aperture Radar Signal Processing Algorithms. Norwood, Massachusetts: Artech House, 1995.
  • R. H. Stolt, “Migration by Fourier Transform,” Geophysics., vol. 43, no. 1, pp. 23–48, C. Bayındır, “Denizlerdeki petrol kirliliğinin sentetik açıklıklı radar görüntüleri değişim saptama yöntemleriyle tespiti,” 8. Kıyı Mühendisliği Sempozyumu, pp. 907- , İstanbul, 2014. (In Turkish)

Details

Primary Language English
Subjects Engineering
Journal Section Articles
Authors

Cihan BAYINDIR This is me

Publication Date January 20, 2016
Published in Issue Year 2015, Volume 11, Issue 1

Cite

APA Bayındır, C. (2016). A NOVEL NONLINEAR FREQUENCY MODULATED CHIRP SIGNAL FOR SYNTHETIC APERTURE RADAR AND SONAR IMAGING . Journal of Naval Sciences and Engineering , 11 (1) , 68-81 . Retrieved from https://dergipark.org.tr/en/pub/jnse/issue/10002/123537