低仰角对流层散射斜延迟实时估计方法

发布时间：2018-01-20 15:32

本文关键词： 对流层散射大气折射斜延迟射线描迹　出处：《电子与信息学报》2017年06期 　论文类型：期刊论文

【摘要】：针对缺乏气象数据情况下低仰角对流层散射斜延迟的实时估计问题,该文提出一种基于射线描迹的对流层斜延迟估计方法。该算法利用UNB3m模型获取大气气象参数,建立了对流层大气折射率剖面模型,克服了气象数据对射线描迹法中折射率计算的限制。选取亚洲地区8个国际GNSS服务(International GNSS Service,IGS)测站2012年的实测气象数据,计算对流层大气折射率剖面,验证了对流层延迟模型的精度小于25 mm;选取基线距离适宜的3个测站分成3组散射通信比对站,利用射线描迹法计算了其在0°～5°入射角下全年的斜延迟,计算结果表明:3组比对站最大单向传输斜延迟为22.38～48.37 m;在进行双向时间比对相互抵消95%的情况下,时间延迟为3.73～8.07 ns。
[Abstract]:In view of the problem of real-time estimation of scattering oblique delay in low elevation troposphere without meteorological data. In this paper, a method for estimating tropospheric oblique delay based on ray tracing is proposed, which uses UNB3m model to obtain atmospheric meteorological parameters and establishes a tropospheric atmospheric refractive index profile model. This paper overcomes the limitation of meteorological data on the refractive index calculation of line tracing method. Eight international GNSS services in Asia are selected. The atmospheric refractive index profile of troposphere was calculated by the meteorological data measured by IGS station on 2012. The accuracy of tropospheric delay model was verified to be less than 25 mm. Three stations with suitable baseline distance are divided into three groups of scattered communication comparison stations. The annual oblique delay at 0 掳~ 5 掳incidence angle is calculated by ray tracing method. The results show that the maximum one-way transmission oblique delay is 22.38 ~ 48.37 m. The time delay is 3. 73 ~ 8. 07 ns under the condition of two way time ratio canceling each other 95%.
【作者单位】：空军工程大学防空反导学院;西北核技术研究所;
【基金】：国家自然科学基金(61571459)~~
【分类号】：TN011.3;TN926
【正文快照】： 1引言对流层散射传播广泛应用于军事通信领域[1]。对流层散射通信是利用对流层大气作为传输媒介来实现超视距通信,具有传输容量大、越障能力强、抗干扰性好和机动性较高等优点[2-3]。文献[4,5]将双向时间比对技术应用于对流层散射通信,提出对流层散射双向时间比对(Two Way Tro

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