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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 influence of the performance evaluation function on the phase-locking effect in jitter phase-locked technique is theoretically analyzed. It is found that the size of the pinhole aperture for obtaining the performance evaluation function has a great influence on the phase-locking effect. As the size of the pinhole increases, the sign of the performance evaluation function will change and the value will also change greatly. The effect of beam duty cycle, number of beams, unit beam size and wavelength on the optimal evaluation function is analyzed in detail. The analysis shows that the duty cycle of the beam array and the number of array beams have less influence on the pinhole size corresponding to the positive value optimal evaluation function. The diameter of the pinhole ranges from 0.7 to 0.8 in the central main lobe of the far field spot. The unit beam spot The size and wavelength do not affect the optimal pinhole size. The pinhole size corresponding to the negative value optimal evaluation function approximately linearly increases with the increase of the number of light beams, and the duty cycle has less effect on the pinhole size.