中文摘要：

介绍了传统AO系统的局限性和MCAO的基本原理，根据相关文献对单、双共轭AO系统等晕角进行了推导，并对共轭高度的选取进行了深入的探讨。结合平程与垂程两种应用，对单、双层共轭系统等晕角进行了模拟比较，结果显示MCAO在等晕角增益方面具有显著的效果。对于传输距离不太远时，采用单层共轭校正系统；而对于远距离的遥感系统，则采用MCAO校正系统更为有效。

英文摘要：

The limitation of classical adaptive optics （AO） system and the basic principle of multi-conjugate adaptive optics （MCAO） a system are briefly introduced. The isoplanatic angle＇s expression of single and dual-conjugate is deduced on the base of the relative reference, and the selections of conjugation height are thoughtfully discussed. The isoplanatic angles for single and dual-conjugate and classical AO system are compared in the condition of level and upright-propagtion. The simulation results indicate that MCAO system has a notable effect on the gain of the isoplanatic angle, single-conjugate AO system is suitable for short-distance propagation applications, but for the far-distance remote sensing, MCAO system performs better than the former.