低仰角對(duì)流層散射斜延遲實(shí)時(shí)估計(jì)方法

吳文溢; 陳西宏; 劉少偉

doi:10.11999/JEIT160776

低仰角對(duì)流層散射斜延遲實(shí)時(shí)估計(jì)方法

doi: 10.11999/JEIT160776

2.
(空軍工程大學(xué)防空反導(dǎo)學(xué)院西安 710051) ②(西北核技術(shù)研究所西安 710024)

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(61571459)

計(jì)量
- 文章訪(fǎng)問(wèn)數(shù): 1221
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2016-07-22
- 修回日期: 2017-04-05
- 刊出日期: 2017-06-19

Real-time Estimation Method for Tropospheric Scatter Slant Delay at Low Elevation

2.
(Air and Missile Defense College, Air Force Engineering University, Xi&rsquo

Funds:

The National Natural Science Foundation of China (61571459)

摘要

摘要: 針對(duì)缺乏氣象數(shù)據(jù)情況下低仰角對(duì)流層散射斜延遲的實(shí)時(shí)估計(jì)問(wèn)題，該文提出一種基于射線(xiàn)描跡的對(duì)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(duì)流層大氣折射率剖面模型，克服了氣象數(shù)據(jù)對(duì)射線(xiàn)描跡法中折射率計(jì)算的限制。選取亞洲地區(qū)8個(gè)國(guó)際GNSS服務(wù)(International GNSS Service, IGS)測(cè)站2012年的實(shí)測(cè)氣象數(shù)據(jù)，計(jì)算對(duì)流層大氣折射率剖面，驗(yàn)證了對(duì)流層延遲模型的精度小于25 mm；選取基線(xiàn)距離適宜的3個(gè)測(cè)站分成3組散射通信比對(duì)站，利用射線(xiàn)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(duì)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(duì)相互抵消95%的情況下，時(shí)間延遲為3.73 --8.07 ns。
- 對(duì)流層散射 /
- 大氣折射 /
- 斜延遲 /
- 射線(xiàn)描跡
Abstract: Based on ray tracing, a real-time method of tropospheric scatter slant delay estimation is proposed to estimate the low-elevation tropospheric delay in the absence of meteorological data. The model uses the UNB3m model to obtain atmospheric meteorological parameters, establishes the tropospheric atmospheric refractive index profile model, and overcomes the limitation of meteorological data on the refractive index calculation in the ray tracing method. The atmospheric refractive index profile of the troposphere is calculated by using the meteorological data of the International GNSS Service (IGS) stations in Asia in 2012, and the accuracy of the tropospheric delay model is verified to be less than 25 mm. The three stations with the baseline distance are selected and divided into three sets of scatter correspondence comparison stations. The oblique delay at0--5 incident angle is calculated by ray tracing method. The results show that the maximum one-way propagation delay is 22.38--48.37 m for the three groups, and 3.73--8.07 ns for the two-way time offset 95%.
- Tropospheric scatter /
- Atmospheric refraction /
- Slant delay /
- Ray-tracing

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