Dissertation > Excellent graduate degree dissertation topics show

Stepped-frequency Chirp Signal and Synthetic Aperture Radar Imaging Study

Author: LiLiYa
Tutor: WuShunJun
School: Xi'an University of Electronic Science and Technology
Course: Signal and Information Processing
Keywords: Synthetic Aperture Radar (SAR) Stepped-frequency Chirp Bandwidth Signal Synthetic De-chirping Range-Doppler Imaging Algorithm
CLC: TN957.51
Type: Master's thesis
Year: 2006
Downloads: 25
Quote: 0
Read: Download Dissertation

Abstract


SAR is an imaging radar in two dimensions (range and azimuth). The azimuth resolution depends on the length of the synthetic aperture, and the range resolution is decided by pulse compression of the large bandwidth signals. The range resolution is inverse proportional to the bandwidth of signal, so the radar signals must have large bandwidth in order to obtain the high range resolution. But there is a big challenge to obtain such signal. The technique of wideband and ultra-wideband can be used to get the high range resolution.The presents of the stepped-frequency Chirp radar signal provides a new solution to obtain ultra-wideband radar signals The stepped-frequency Chirp radar signal is composed of Chirp pluses which carrier frequencies are changed High range resolution is achieved by means of the synthetic bandwidth signal technique. Firstly, the stepped-frequency Chirp radar signal is analyzed and the ambiguity function is given. Secondly, two methods to combine bandwidth signal are discussed. One is based on the basal receive mode in time field and the other is based on the de-chirping operation in time field. Some experiments are done and some results of verification are given. Lastly, the theory and algorithms of synthetic aperture radar imaging is shown and the technique of the SAR using the stepped-frequency Chirp radar signal is put forward. Two different methods of the combined bandwidth signal bring two different ways of SAR imaging. Some experiments is done and some results verifies that the methods are feasible. The raw SAR data is processed and the result is shown that it can be achieved in projects.

Related Dissertations

  1. SAR Raw Data Compression Based on the Compressed Sensing Technology,TN958
  2. A Study of Atmospheric Boundary Layer Waves over the Yellow Sea and the Bohai Sea Using Satellite SAR Images,P732
  3. Coastline Detection in SAR Images Based on Stationary Wavelet Transform,TN957.52
  4. Study on Imaging of FMCW SAR,TN958
  5. Parameters Inversion Using PolInSAR in Foreast Area by Coherence Set,TN958
  6. Research on Squint Imaging Algorithm of Airborne SAR,TN958
  7. Study on Method of Sar Detecting Moving-Targrts on the Ground,TN958
  8. The Study of Target Classification in SAR Imagery,TN957.52
  9. Study on the Methods of Ship Detection in SAR Imagey,TN957.52
  10. SAR Image Segmentation Based on Instantaneous Coefficient of Variation,TN957.52
  11. Research on Channel Equalization Based on DPCA for Airborne SAR/GMTI System,TN958
  12. Formation and spatial resolution satellite SAR ambiguity function of,TN958
  13. Research on the Scene Matching Algorithms Based on SAR Images,TN957.52
  14. Study on Ground Moving Area Targets Detection Based on Synthetic Aperture Radar,TN958
  15. Software Implementation of Rafar Imaging Algorithm,TN957.52
  16. Study on Parameters Inversion of EM Scattering from Vegetation,TN011
  17. Study on Target Location and Blind Navigation Techniques with Airborne SAR,TN957.52
  18. Research on Parameter Estimation of Radar Signals Based on Time-Frequency Distribution,TN957.51
  19. Research on Oil Spill Monitoring by Spaceborne SAR with Texture,TP79
  20. Research on Detection of Ship Wake from Sar Imagery,TN957.52

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar equipment,radar > Radar receiving equipment > Radar signal detection and processing
© 2012 www.DissertationTopic.Net  Mobile