对流层散射双向时间比对中对流层斜延迟实时估计

摘要

Tropospheric slant delay is a main error source in two way time transfer via tropospheric scatter communication.A method for real-time estimation of tropospheric slant in two way time transfer via tropospheric scatter communication is proposed.The meteorological data of the station are calculated by the GPT2w model to overcome the reliance on the real-time meteorological data in the estimation of tropospheric delay.In order to solve the problem of the fixed height of the top troposphere layer,the real height of the top troposphere layer is calculated by geometric method to solve the practical application.Three stations in Japan are selected and compared with each other.After verifying the accuracy of the Hopfield model,the tropospheric delay of the three groups at different angles and different time is calculated.The results show that the tropospheric slant delay in two-way troposphere time transfer increases with the increase of the distance,and decreases with the increase of the angle,and the variation characteristics of the four seasons are obvious.The tropospheric delay of the three stations is between 10～35 m,and the time delay after subtracting 90％ is 3.5～11.8 ns.%对流层斜延迟是对流层散射双向时间比对中一个重要误差源,该文提出一种对流层散射双向时间比对中对流层斜延迟实时估计方法.通过GPT2w模型计算测站气象数据,克服对流层斜延迟估计中对实时气象数据的依赖.针对Hopfield模型中固定的对流层散射顶层高,利用几何方法计算动态对流层散射顶层高,以解决对流层散射双向比对的实际应用问题.选取日本地区3个测站,两两进行比对,在验证Hopfield模型精度后,计算3组比对站在不同入射角和不同时间的对流层斜延迟.计算结果表明,对流层散射双向时间比对中对流层斜延迟呈现出随比对距离增大而增大,随入射角增大而减小的特性,并且四季变化特性也比较明显.3个比对站的对流层散射斜延迟10～35 m之间,经比对抵消90％后的时间延迟为3.5～11.8 ns.