Dissertation > Excellent graduate degree dissertation topics show

Research on Distributed SAR Imaging Based on Compressive Sensing

Author: LiCongCong
Tutor: LiaoJiaXuan
School: University of Electronic Science and Technology
Course: Electronics and Communication Engineering
Keywords: distributed SAR DCS theory multi-beam ambiguity resolving spectrum synthesis imaging algorithm
CLC: TN957.52
Type: Master's thesis
Year: 2013
Downloads: 19
Quote: 0
Read: Download Dissertation

Abstract


With people gradually rising the standards for radar imaging, the traditional singleSAR platform’s application limitations manifested gradually. Distributed SAR systemutilized multiple SAR platforms’collaboration, and could realize high-resolution, wide-swath imaging tasks while single SAR platform couldn’t achieve. However, thedistributed SAR system also faced conundrums like high-speed data acquisition,high-capacity data storage and transmission. Conventional CS radar imaging technologycould reduce the system’s sampling rate and the amount of echo data, but the imagingreconstruction efficiency was very low. Under this background, based on DCS theorywhich was derived from CS theory, this article launched a study on distributed SARsystem imaging technology based on DCS. The center contents are as follows:1. Radar imaging technology based on DCS is researched. According to thecharacteristics of radar echo data, the SAR imaging mathematics mode is constructedand a two-dimensional SAR imaging algorithm based DCS is presented which has goodimaging effect. Besides, with using the new algorithm, the amount of echo data andreconstruction time are both reduced.2. Azimuth multiple-beam SAR imaging technology based on DCS is researched.Signal model of distributed SAR system with single transmitter and multiple receiversis established. Under the guidance of equivalent phase center principle, equivalent echodata is got with phase compensation, and the resolution is improved with the spatialsampling increasing. Based on this, a novel multi-beam SAR imaging algorithm basedon DCS is proposed, it could realize compression and reconstruction in both rangedimension and azimuth dimension. Simulation results show that the algorithm has goodimaging effect. Besides, while comparing with CS imaging algorithm, the newalgorithm has better anti-noise performance and higher operating efficiency.3. Ambiguity resolving imaging technology of distributed SAR based on DCS isresearched. With using spatial filtering theory, echo data which the sparsely populateddistributed satellites received were eliminated ambiguity, and high-resolution imageswere got. Based on this, a novel distributed SAR ambiguity resolving imaging algorithm based on DCS is proposed which could achieve high-resolution imaging withusing little echo data. Besides, for analysising of noisy signal simulation, results showthat the new algorithm has higher efficiency and better reconstruction effect whilecomparing with CS algorithm.4. Spectrum synthesis imaging technology of distributed SAR based on DCS isresearched. From the standpoint of spreading spectrum, the reasons of different echodata’s frequency shift were analysed. With relative time-shift compensation and phasecompensation adding to echo data, broadening Doppler band was got and azimuthresolution was improved. Based on this, a novel distributed SAR spectrum synthesisimaging algorithm based on DCS was proposed. With DCS compress reconstruction inrange dimension, the algorithm effectively reduces the echo data and improves imagingefficiency.

Related Dissertations

  1. MM-wave Multi-Beam Cylindrical Dielectric Lens Antenna,TN820
  2. Study of Digital Seabed Terrain and Physiognomy Analysis Based on Multi-Beam Data,P737.2
  3. Research on the Near-field Imaging of Millimeter-wave Synthetic Aperture Radiometer,TN015
  4. 3D Radar Imaging Based on Sparse Measurement,TN957.52
  5. SAR Raw Data Compression Based on the Compressed Sensing Technology,TN958
  6. Radar Imaging System Based on Common Electromagnetism Calculating Software,TN958
  7. Technology on Design and Implementation of Multi-Mode Radar Waveform System,TN957.51
  8. Form a network of technical research based a phased array Leidaduobo beam,TN958.92
  9. Research on Multi-beam Synthetic Aperture Sonar Imaging Technology,U666.7
  10. Multibeam bathymetric information acquisition and display system landscape,TP391.41
  11. Research on UVA Sar Imaging Algorithm,TN957.52
  12. Research on Squint Imaging Algorithm of Airborne SAR,TN958
  13. Research on Inverse Synthetic Aperture Radar Imaging Methods and Jamming Methods,TN958
  14. Stepped-frequency Chirp Signal and Synthetic Aperture Radar Imaging Study,TN957.51
  15. Moving Load Identification of Multi-girder Bridge Based on Finite Element Model Updating,U441.2
  16. Design and Imaging of SAR System Based on Near-Space,TN958
  17. Star machine joint SAR imaging processing algorithms and motion compensation,TN958
  18. Research foresight bistatic SAR imaging algorithm simulation and modeling,TN958
  19. With varying characteristics shift the star machine joint bistatic SAR imaging algorithm,TN958
  20. Study of Position Accuracy and Space Synchronization Methods for Bistatic Radar,TN958
  21. Research of Key Technology of GMTI in Distributed SAR,TN958.2

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