本文關(guān)鍵詞： 對流層散射 大氣折射 斜延遲 射線描跡　出處：《電子與信息學(xué)報(bào)》2017年06期 　論文類型：期刊論文

【摘要】：針對缺乏氣象數(shù)據(jù)情況下低仰角對流層散射斜延遲的實(shí)時(shí)估計(jì)問題,該文提出一種基于射線描跡的對流層斜延遲估計(jì)方法。該算法利用UNB3m模型獲取大氣氣象參數(shù),建立了對流層大氣折射率剖面模型,克服了氣象數(shù)據(jù)對射線描跡法中折射率計(jì)算的限制。選取亞洲地區(qū)8個(gè)國際GNSS服務(wù)(International GNSS Service,IGS)測站2012年的實(shí)測氣象數(shù)據(jù),計(jì)算對流層大氣折射率剖面,驗(yàn)證了對流層延遲模型的精度小于25 mm;選取基線距離適宜的3個(gè)測站分成3組散射通信比對站,利用射線描跡法計(jì)算了其在0°～5°入射角下全年的斜延遲,計(jì)算結(jié)果表明:3組比對站最大單向傳輸斜延遲為22.38～48.37 m;在進(jìn)行雙向時(shí)間比對相互抵消95%的情況下,時(shí)間延遲為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 擄~ 5 擄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%.
【作者單位】： 空軍工程大學(xué)防空反導(dǎo)學(xué)院;西北核技術(shù)研究所;
【基金】：國家自然科學(xué)基金(61571459)~~
【分類號(hào)】：TN011.3;TN926
【正文快照】： 1引言對流層散射傳播廣泛應(yīng)用于軍事通信領(lǐng)域[1]。對流層散射通信是利用對流層大氣作為傳輸媒介來實(shí)現(xiàn)超視距通信,具有傳輸容量大、越障能力強(qiáng)、抗干擾性好和機(jī)動(dòng)性較高等優(yōu)點(diǎn)[2-3]。文獻(xiàn)[4,5]將雙向時(shí)間比對技術(shù)應(yīng)用于對流層散射通信,提出對流層散射雙向時(shí)間比對(Two Way Tro

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