天基光电望远镜对空间目标成像的模拟

Imaging simulation for space target on space-based opto-electronic telescope

提出了一种天基望远镜对空间目标成像的模拟方法。由卫星轨道参数计算得到卫星在地心赤道坐标系中的坐标,再通过平移、旋转和比例变换将其变换到望远镜坐标系中的坐标,模拟得到卫星的成像图。通过旋转和比例变换,将恒星坐标从地心赤道坐标系变换到望远镜坐标系,模拟得到星空成像图。两者合成得到总模拟图。将望远镜的位置矢量和光轴的方向矢量之间的夹角作为望远镜视场是否被地球遮挡的判断依据。以0星等和10星等为参考,用计算机模拟得到256级灰度图。仿真结果表明,该方法既能有效地模拟卫星的运动,又可以克服对相同星空背景的重复模拟。

A method of simulation for satellite imaging on a space-based telescope is presented. The coordinates of the satellite in the geo-center equatorial are computed with the satellite orbit＇s parameters. Then it is transformed to the telescope＇s coordinates by means of coordinate translation, rotate and proportion transformation and the satellite image is obtained. The coordinates of star are processed in the same way and the star image is also obtained. By combining the star image with the satellite image, the required image is achieved. The angle between direction vector and position vector is used as the criterion to determine whether the telescope is in the shadow of the earth. With 0 magnitude and 10 magnitude as reference, 256 scale gray images are simulated and experimental results show that this method not only can effectively simulate the satellite＇s track but also can avoid the repeated simulation of the same star background.