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在Park模型基础上,建立了二维机载正侧视条带模式合成孔径激光雷达(SAL)平台振动对成像的影响简化数学模型;在振动频率不超过500Hz的情况下,仿真计算了振幅、频率、初相位和峰值加速度等振动参数对SAL图像分辨率的影响,给出了振动影响下理想点目标和扩展面目标的SAL图像。仿真结果表明,振动的峰值加速度是直接和图像模糊程度最相关的量,峰值加速度越大,图像模糊程度越高,存在峰值加速度阈值,小于这个阈值时,图像基本不受影响,而大于另一个阈值时,图像开始出现重影;另外,仿真计算结果也表明,振动初相位对图像质量恶化也有重要影响。
On the basis of Park model, a simplified mathematical model of the effect of vibration on the imaging platform of a two-dimensional airborne frontal-side-look-up mode synthetic aperture laser radar (SAL) was established. When the vibration frequency did not exceed 500Hz, The influence of vibration parameters, such as frequency, initial phase and peak acceleration, on the resolution of SAL image is presented. The SAL images with ideal point targets and extended plane targets under vibration influence are given. The simulation results show that the peak acceleration of vibration is directly related to the degree of image blurring. The larger the peak acceleration and the higher the degree of image blurring, the higher the peak acceleration threshold is. If the peak acceleration is less than this threshold, the image will be basically unaffected and larger than the other Threshold, the image starts to ghosting; In addition, the simulation results also show that the initial phase of the vibration of the image quality degradation also has a significant impact.