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Study on Airborne ISAR Imaging of Ship Targets and Its Hardware Implementation

Author: YuYuSheng
Tutor: ZhuZuoYin
School: Nanjing University of Aeronautics and Astronautics
Course: Communication and Information System
Keywords: Inverse synthetic aperture radar (ISAR) range alignment optimal imaging time selection parallel processing general parallel digital signal process system
CLC: TN957.52
Type: Master's thesis
Year: 2009
Downloads: 58
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Abstract


Inverse synthetic aperture radar (ISAR) is a kind of high resolution imaging radar, which allows fine resolution, all weather, day-and-night imaging of noncooperative targets in long range. Therefore, it is of great military and civil values. Among the applications of ISAR, the imaging of ship target is an active topic. This thesis studies on the range alignment algorithm of ISAR imaging; and the solution to range alignment in condition of large integration angle. Moreover, our thesis deals with the optimal imaging time selection algorithm, which is based on the rotation vector estimation. The feasibility and effectiveness of the algorithm is verified through the imaging experiment using the experimental data. Considering the ISAR imaging under real-time condition, the range alignment and optimal imaging time selection algorithms are implemented on parallel DSP devices using live and experimental ISAR data. The main content of this thesis can be concluded as follow:In chapter 1, the development of the ISAR is reviewed; the principle of the ISAR imaging is introduced; and the application of the parallel DSP system in radar signal processing is outlined.In chapter 2, the principle of the ISAR range alignment is described; a kind of range alignment algorithm based on global entropy minimization is proposed after the review of tradition range alignment algorithms; ISAR range alignment in case of large integration angle is also discussed and a segmentation algorithm is given to improve the performance.In chapter 3, firstly, the characteristic of the echo of ship target is analyzed, and the signal model is given. Then the optimal imaging time selection algorithm is introduced. Finally imaging experiment on simulated target is implemented to verify the effectiveness of the algorithm.In chapter 4, the implementation of ISAR imaging process on the parallel digital signal processing system is studied. Based on the analysis of the global entropy minimization range alignment algorithm and the optimal imaging time selection algorithm in chapter 2 and 3, ISAR imaging task is partitioned and the parallel imaging process is implemented.In chapter 5, the work of this thesis is concluded and the future work is pointed out.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar equipment,radar > Radar receiving equipment > Data,image processing and admission
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