The Research Of Several Topics In ISAR Imaging

Inverse Synthtic Aperature Radar(ISAR) is actracting more and more attention in the world, and is becoming a new research field in signal processing. This paper pay more attention to two problems in ISAR,that is improving the focus quality of the ISAR image and ISAR imaging of high speed moving target.To improve the focus quality of the image of ISAR target, Translation compensation is indispensable. Translation compensation consists of range alignment, which aligns the signals from the same scatterer in range, and phase adjustment, which removes the translational Doppler phase. The time-frequency method is a promising phase adjustment technique for inverse synthetic aperture radar (ISAR). Usually, the time-frequency method estimates the translational Doppler frequency and thus the translational Doppler phase by detecting the peaks of the time-frequency representation at different times. Unfortunately, it has some defects, such as the sensitivity to noise and target scintillation, and the aliasing of the time-frequency representation due to undersampling. In...