低仰角對流層散射斜延遲實時估計方法

吳文溢; 陳西宏; 劉少偉

doi:10.11999/JEIT160776

低仰角對流層散射斜延遲實時估計方法

doi: 10.11999/JEIT160776 cstr: 32379.14.JEIT160776

2.
(空軍工程大學防空反導學院西安 710051) ②(西北核技術研究所西安 710024)

基金項目:

國家自然科學基金(61571459)

計量
- 文章訪問數(shù): 1243
- HTML全文瀏覽量: 126
- PDF下載量: 294
- 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: 針對缺乏氣象數(shù)據(jù)情況下低仰角對流層散射斜延遲的實時估計問題，該文提出一種基于射線描跡的對流層斜延遲估計方法。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算的限制。選取亞洲地區(qū)8個國際GNSS服務(International GNSS Service, IGS)測站2012年的實測氣象數(shù)據(jù)，計算對流層大氣折射率剖面，驗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個測站分成3組散射通信比對站，利用射線描跡法計算了其在0--5 入射角下全年的斜延遲，計算結果表明：3組比對站最大單向傳輸斜延遲為22.38-- 48.37 m；在進行雙向時間比對相互抵消95%的情況下，時間延遲為3.73 --8.07 ns。
- 對流層散射 /
- 大氣折射 /
- 斜延遲 /
- 射線描跡
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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