采用数值模拟的方法分析了不同离轴角距离、不同大气湍流强度及激光出光口径下,信标的纯角度非等晕误差对激光发射自适应光学系统(AO)校正效果的影响。同时针对离轴点信标,提出了一种去除整体倾斜的准直方法。数值模拟结果表明,在其他条件不变的情况下,信标离轴角距离越大,口径越大湍流强度越强,点信标离轴引起的纯角度非等晕误差越大,但较(θ/θ0)5/3偏小,与理论分析符合较好。通过数据拟合得出,当出光口径一定时,纯角度非等晕误差仅与θ/θ0有关。给出了纯角度非等晕误差与θ/θ0的定量关系,为快速评价角度非等晕误差提供了模型支持。

With numerical simulation codes, the pure angular anisoplanatism effects on laser projection adaptive optics (AO) correction are studied for different offset angular displacement, turbulence strength, and laser projection diameter. For offset point beacon, a method of eliminating tip-tilt is presented for beam collimation. The simulation result, which agrees with theoretical analysis, shows that the pure angular anisoplanatic error increases with the increase of the offset angle, the turbulence strength and the projection diameter, and is smaller than the value (θ/θ0)5/3. In a certain laser projection diameter, the curve fitting indicates that angular anisoplanatic error is only depended on the ratio of θ/θ0. The mathematical relationship is obtained, which provides model support for rapid evaluation of angular anisoplanatic error.