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Research on Missile-borne Spotlight Mode SAR Imaging

Author: RenGuoLei
Tutor: GuoGuiRong
School: National University of Defense Science and Technology
Course: Information and Communication Engineering
Keywords: Missile-borne spotlight SAR Motion compensation Spectrum selection method Super-resolution algorithm Fractional Fourier Transform
CLC: TN957.5
Type: Master's thesis
Year: 2007
Downloads: 176
Quote: 1
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Abstract


As an imaging radar , synthetic aperture radar (SAR Synthetic Aperture Radar) expanded the original concept of the radar , with a capacity of moving targets and regional targets imaging is one of the key directions of the development of radar precision guidance technology . Missile-borne synthetic aperture radar platform motion speed , non- uniform straight movement and big squint angle three characteristics . The complexity of the missile movement , increase the difficulty of imaging processing , real-time imaging algorithm , the precision of the motion compensation have higher requirements . This thesis is closely combined with the characteristics of the missile movement , focusing on the missile-borne spotlight mode synthetic aperture radar imaging approach . Firstly, according to the characteristics of missile flight , the establishment of a high-speed diving model of the missile-borne SAR imaging and phase error characteristics affect the image quality , and laid the foundation for subsequent research . Then echo data - based motion compensation algorithm . The motion compensation technology is the key to obtain high-resolution SAR images . Since the the missile movement of non- uniform straight motion compensation , radar relative to the imaging target non- uniform rotation . The traditional approach is two-dimensional non-linear interpolation , but this approach is computationally intensive , and will result in a decline in the quality of the image and interpolation imprecise . This paper presents an algorithm based on spectral selection (Spectral-fit) , the non - uniform rotation compensation and imaging algorithms more closely together . The simulation results show the effectiveness of the algorithm . As the missile flight path by the maximum overload limit seeker turned angle during the imaging process can not be too large. This small corner of imaging conditions , the problem of how to get the higher resolution , paper of several SAR conventional super-resolution algorithm and simulation results are given . Then mode for missile-borne spotlight SAR requirements imaging in strabismus state , a Doppler parameter estimation based on fractional Fourier transform (FrFT) imaging algorithm , simulation results demonstrate the effectiveness of the algorithm .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar equipment,radar > Radar receiving equipment
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