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捕获是激光通信建立的必要手段,为探索通信中光学系统各像差对捕获性能的影响,从信标光传输过程和激光通信像质评价方式出发,分析了单色像差均方根小于0.2λ时对捕获质心处光强的影响,采用质心和加权质心方法计算了彗差、倾斜(畸变)所造成的捕获偏差;同时分析了各种单色像差之间对质心光强、捕获偏差的补偿关系。分析表明离焦能对球差、像散造成的质心光强下降有较好的补偿作用,畸变产生的捕获偏差可以用彗差进行完全补偿。采用Zemax软件设计了卡塞格林式和离轴三反(TMA)通信天线系统,利用该方法计算了在视场小于0.3°、像差综合作用时捕获的质心光强和引入的捕获偏差。计算结果很好地验证了分析结论,这些结论对空间激光天线选型、像质优化策略具有一定的借鉴作用。
In order to explore the influence of each aberration on the acquisition performance of the optical system in communication, the acquisition is based on the process of beacon optical transmission and the quality evaluation of laser communication, the monochromatic aberration root mean square is less than 0.2 λ on the light intensity of the capture center of mass, the centroid and weighted centroid method was used to calculate the coma aberration and tilt (distortion) caused by the capture bias; at the same time analyzed the various monochromatic aberrations on the centroid light intensity, capture bias The compensation relationship. The analysis shows that the defocusing energy can compensate for the decrease of the centroid intensity due to spherical aberration and astigmatism, and the deviation of aberration caused by aberration can be completely compensated by coma. The Cassegrain and off-axis triad (TMA) communication antenna system is designed by Zemax software. The centroid light intensity captured by the combined effect of aberration and the captured bias are calculated using this method. The calculated results verify the conclusion of the analysis well. These conclusions have certain reference value for space laser antenna selection and image quality optimization strategy.