| Popis: |
ISAR images of moving targets are susceptible to distortion, for example, blurring due to small random fluctuation in the targets' motions. Small perturbation in the pitch, roll or yaw motions of an in-flight aircraft can introduce significant distortion to the ISAR images of in-flight aircraft. In this paper, experimental results on the distortion produced by small perturbed yaw motion of a target will be discussed. Numerical simulations of the distorted motions are compared with experimental results. This comparative analysis allows one to characterize the distortion mechanism and to gain some insights into the distortion process in radar imaging. It is found that even very small perturbation in the motion can be sufficient enough to introduce sizeable distortion to the radar images. The distortion can be attributed to the temporal phase modulation effect in the imaging process. |
