针对高空平台(HAP)位置不稳定特性模型，建立更符合实际的Hoyt指向误差分布模型，与理想条件下的Rayleigh指向误差分布模型比较，分析平台间光链路的差错性能。仿真结果表明，在发散角逐渐增大的条件下，Hoyt分布模型与Rayleigh分布模型的误码率(BER)曲线具有相同的变化规律；在相同发散角条件下，Hoyt分布模型的误码率低于Rayleigh分布模型；在最优发散角条件下，Hoyt分布模型误码率与Rayleigh分布模型误码率差值最大，以均方差比值因子取0.2为例，与Rayleigh分布模型相比，Hoyt分布模型的误码率减小9 dB左右。

Based on the model of high altitude platforms (HAP) position instability, the factual Hoyt distribution model which is brought by optical pointing error is constructed. Compared with the ideal Rayleigh distribution model, performance of inter-platforms is analyzed. The simulation results show that there is a similar rule between the factual model and the ideal model with the increase of divergence angle. Under the condition of the same divergence angle, the bit error rate (BER) of Hoyt distribution model is lower than that of Rayleigh distribution model. When the divergence angle is optimized, the difference between factual and ideal distribution model is the biggest. Take 0.2 of root mean square (RMS) ratio as an example, compared with the Rayleigh distribution model, the BER of Hoyt distribution model reduces approximately by 9 dB.