| Summary: | 碩士 === 國立交通大學 === 機械工程系 === 90 === The antenna deviates from the ideal trajectory because of pilot-induced maneuvers, atmospheric gusts acting on the aircraft, and structural vibrations within the aircraft. We have to compensate the motion uncertainty of aircraft by correcting the motion deviation of radar, update the phase of reference signal, and eliminate phase error. The main idea of my thesis is how to compensate the motion error of aircraft, correct phase error, which smears radar image and mispoint the synthetic aperture. Moreover, preventing degradation of resolution. So there are three important steps: first, to study and understand the fundamental imagery approach of SAR. Second, in order to simulate the airborne radar system on the aircraft, we will use six-axis Steword platform for aircraft, three-axis gimbals for radar gimbals, and set up the two-axis gimbals on the six-axis platform. The airborne radar system is simulated with the motion platform. Third, in terms of signal processing, using PGA algorithm to eliminate high order phase error which defocus the radar image.
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