从理论上分析了抖动法锁相技术中性能评价函数对锁相效果的影响。研究发现，相干合成中获取性能评价函数的针孔光阑大小对锁相效果影响较大，随着针孔尺寸增大，性能评价函数的符号将会改变，取值也会产生较大变化。详细分析了光束阵列占空比、光束数目、单元光束尺寸和波长对最优评价函数的影响。分析表明，光束阵列占空比和阵列光束数目对正值最优评价函数对应的针孔尺寸影响较小，针孔直径取值范围为远场光斑中央主瓣宽度的0.7~0.8，单元光束光斑尺寸和波长不对最优针孔尺寸造成影响。负值最优评价函数对应的针孔尺寸随光束数目的增大近似呈线性增大趋势，占空比对其影响较小。

The effect of cost function on phase-locked based on dithering technique is studied. The cost function is often obtained by collecting the energy in a pinhole, and the diameter of the pinhole has a strong effect on the sign and value of the cost function. The effects of the fill factor of laser array, the number of laser beam, the radius of the light spot and wavelength on the best cost function are analysed in detail. It is found that the fill factor of laser array and the number of laser beams have a little effect on the best diameter of the pinhole for positive cost function which is located on 0.7~0.8 of the width of the main lobe of far field pattern. The radius of the light spot and wavelength have no effect on the best diameter of the pinhole. The best diameter of the pinhole for negative cost function will increase along with the number of laser beams increasing, but the fill factor of laser array has no effect on it.