云背景下卫星目标的运动仿真

The Simulation of Satellite Target in Clouds Background

为了模拟卫星目标在云层背景下的运动效果,提出了基于云图像灰度的目标灰度衰减计算方法。利用FY-1C卫星获得的数据,建立了云光学厚度与云反射率的关系,进而确定了云图像灰度与云光学厚度的函数关系。根据Bouguer指数衰减定律,计算目标经云衰减后的灰度。利用该计算方法,模拟了同一目标在不同云层及不同亮度目标在相同云层下的运动效果。仿真结果显示,该方法可以取得较好的目标穿云效果。

In order to simulate the movements of satellite target in clouds background, a method for calculating the penetration rate of cloud based on the gray-level of cloud image is proposed. A relationship between the optical depth and reflectance of clouds is established according to FY-1C data, and the relationship between the optical depth and gray-level of cloud image is established accordingly. With the exponential decay law raised by Bouguer, the degenerate gray-level of target could be further calculated. By using the methods above, the movements of the same target in different clouds backgrounds and different targets in the same clouds background are simulated. Results show that the simulation can achieve high fidelity effects.