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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9dB左右。
A more realistic Hoyt pointing error model is established for HAP instability model. Compared with the Rayleigh directional error distribution model under ideal conditions, the error performance of the optical link between the platforms is analyzed. The simulation results show that the BER curves of Hoyt distribution model and Rayleigh distribution model have the same variation rules with increasing divergence angle. Under the same divergence angle, the Hoyt distribution model has a low bit error rate For the Rayleigh distribution model, under the optimal divergence angle, the difference between the bit error rate of the Hoyt distribution model and the Rayleigh distribution model is the largest. Taking the mean square error ratio factor of 0.2 as an example, compared with the Rayleigh distribution model, the Hoyt distribution model The error rate is reduced by about 9dB.