Synthetic Aperture Radar Signal Model And Imaging Algorithm Research

Choose the laser as the signal carrier of synthetic aperture radar, namely form the synthetic aperture laser radar (SAL-Synthetic Aperture Laser Radar) with unique performance. As the laser has extremely high operating frequency, which can improve the resolution ratio of synthetic aperture ladar, increase the modulation bandwidth and enhance the density of transmission power effectively ;can produce larger doppler frequency-shift for the targets have the same relative velocity, be favorable to detect the target that has a greater speed range; In addition, the system is conveniently miniaturized and integrated in the laser frequency band. Just the synthetic aperture ladar has above-mentioned advantages of various fields, it become the research focus both at home and abroad in recent years.In this paper, based on relevant scientific research projects, for the synthetic aperture laser radar's signal processing theory and technology to carry out the following work:1. Analyze the basic principle of SAL, introduce its systematic main composition, analyze every component function of the system, structure principle and performance, and make the detailed summary to the key technology of its realization.2. Analyze the effect of atmospheric transmission on laser propagation; research on the laser emission continuous signal, which is the linear modulated wavelength model, propose the linear disconnected continuous wave signal model of the modulated wavelength. It is analyzed that the principle of SAL heterodyne reception, and propose finally that SAL heterodyne reception echo signal model under atmospheric interference on the basis of linear disconnected continuous signal model of the modulated wavelength.3. Through the study on the imaging principle of SAL and RD algorithm, derive RD algorithm of SAL based on stripmap model, and analyze the relation among the main parameters; select the proper parameter to carry on simulation analysis to all kinds of goals, the result has verified the validity of the algorithm.4. Study the multi-form impact on imaging under different positions and different modal of airborne SAL, derive the limiting conditions of the multi-form error, study the difference between the movement error influence to imaging of SAR and imaging of SAL, and prove the exactness through simulation.5. Study impact on imaging of radar caused by vibration error of the platform of airborne SAL, derive that airborne vibration'swing is the superposition of obeying normal distributed non-sinusoidal harmonic wave, verify the impact on imaging caused by airborne vibration through some target simulation finally, and compare the difference that the vibration error influence to the imaging of SAL and SAR.