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Research on Dual Mode Imaging Algorithm for Circular-scanning SAR Data Processing

Author: JinXueSong
Tutor: LiYong
School: Nanjing University of Aeronautics and Astronautics
Course: Communication and Information System
Keywords: Synthetic Aperture Radar Linear distance Doppler algorithm Doppler beam sharpening Looking around the scan mode Dual- band imaging Geometric distortion correction Parameter Design Error Analysis
CLC: TN957.52
Type: Master's thesis
Year: 2009
Downloads: 76
Quote: 0
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Abstract


Synthetic Aperture Radar (SAR) is an important area of ??modern remote sensing technology to all-time, all-weather, long distances on the ground scenery for high resolution imaging, an important military and civil values. SAR imaging modes including classic striped, spotlight and scanning, the radar operates in three modes, the imaging area are located on one side of the radar platform flight path. Different from the traditional mode of SAR work, we study two imaging modes - looking around the imaging mode and dual-band imaging mode, look SAR radar platform capable of mapping the bottom of the annular area imaging; dual band SAR imaging mode is looking around extensions, can be obtained on both sides of the radar platform, high resolution SAR image region, taking into account the range of the image with high resolution and scene characteristics, and improved imaging efficiency. Of the main text summarized as follows: The first chapter reviews the history of SAR technology, introduced the current domestic and international developments in SAR technology and describes the research background and research content. Second chapter describes the two can work in the case of high squint radar imaging algorithm, namely the Doppler beam sharpening (DBS) technology and linear range Doppler (LRD) algorithm, analyzes and compares the actual beam imaging (RBM ), DBS and SAR three kinds of advantages and disadvantages of radar imaging modality applications, and by processing the measured data to be verified. Chapter 3 presents a look around SAR imaging algorithm, were obtained through a point target simulation platform level flight and radar swooping state surveying SAR images. Studied a look around without reducing resolution SAR images and real-time imaging algorithm higher surveying process improvements, the measured results verify the validity of the data processing. The fourth chapter surveying SAR imaging based on the study of a new dual-band imaging mode, image resolution and proposed to meet the conditions for seamless system parameter optimization design criteria, and through the point target simulation and experimental data processing verify the effectiveness of the algorithm. Chapter Five of the surveying SAR antenna scan angle measurement system errors and radar antenna phase center (APC) on the imaging position measurement error correction of geometric distortion, and studied a radar echo signal based APC height estimation method that can effectively improve the surveying SAR image quality. Chapter VI Conclusion summarizes the work on the text, and pointed out the deficiencies in the current work and future work directions.

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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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