星载自适应光学系统的双导星信标理论研究

星载相机的波前畸变主要来源于两个部分:由于温度场、重力场变化引起的相机光学系统自畸变;由于大气湍流引起的波前误差。为获得高分辨率的图像,需要校正波前误差。提出一种对星载光学系统波前畸变进行有效探测的技术。星载激光器分时产生钠导星和瑞利导星,前者用于校正自畸变,后者用于校正大气湍流造成的波面像差。针对该方法对激光能量的要求,建立了双导星信标系统的数值模型,并进行仿真。结果表明,该方法对激光器的要求,在目前是可以实现的。该方法可以用于空间相机光学系统的波面畸变探测,从而为星载自适应光学的进一步研究提供依据。

Model of beacon used in the air-borne adaptive optical system

Artificial beacon is a key issue of adaptive optical s ystems.For the air-borne optical systems,artificial beacon is used to sample th e wavefront distortion which is mainly caused by the atmospheric turbulence and the change of gravity field and temperature field.A kind of beacon composed of b oth Rayleigh and sodium guide stars is presented to detect the wave-front.A num erical model is discussed.The corresponding simulation result is given.It is fou nd that the adaptive optics based on the beacon composed of the two kinds of las er guide stars are feasible for the wave-front detection of air-borne optics.