Abstract: To the characteristics of route’s channel quality ordering under two models LQA and prediction，the reliability distributing of LQA which can be regarded as revised factor of LQA channel quality ordering is achieved according to the analysis of route’s SNRs.Combined with the propagation predictions model，the channel quality ordering scheme under the weighted algorithm is given；according to the ALE working mode，capability evaluating standards are established， and the theoretical models of successful rate of link establishment and average link establishment time are constructed；and the simulation results show that the channel ordering ascertained by weighted algorithm has a high resemblance with the real ordering.Its successful rate of one time link establishment precedes the LQA model’s and prediction model’s，and the average link establishment time at each point on the route is shorted，which provides theoretical basis for channel ordering when the route ALE calling link is being established.

Key words: HF air-to-ground communications, channel ordering, Automatic Link Establishment（ALE）, weighted algorithm, reliability distribution

摘要： 综合LQA和预测两种模型下航线信道质量排序的特点，通过对航线信噪比进行统计分析，得出了LQA的时效性分布模型，并以此作为修订LQA信道质量排序的修正因子，结合长期预测模型，给出了加权算法下的信道质量排序方案，根据ALE工作模式，确立了性能评估准则，构造了建链成功率和平均建链时间的理论模型；经仿真验证，加权算法下确立的信道排序与实际信道质量排序相似度高，其一次建链成功率优于LQA模型和预测模型，航线各点平均建链时间短，为航线ALE呼叫建链时信道排序提供了理论依据。

关键词: 短波地空通信, 信道排序, 自动链路建立（ALE）, 加权算法, 实效性分布