低仰角下對流層散射斜延遲估計方法
doi: 10.11999/JEIT150628
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1.
(空軍工程大學(xué)防空反導(dǎo)學(xué)院 西安 710051) ②(空軍工程大學(xué)信息與導(dǎo)航學(xué)院 西安 710077)
基金項目:
國家自然科學(xué)基金(61172169)
Estimating Tropospheric Slant Scatter Delay at Low Elevation
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1.
(Air and Missile Defense College, Air Force Engineering University, Xi&rsquo
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2.
(Information and Navigation College, Air Force Engineering University, Xi&rsquo
Funds:
The National Natural Science Foundation of China (61172169)
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摘要: 對流層斜延遲是對流層散射雙向時間比對系統(tǒng)的主要誤差來源，目前尚未有對系統(tǒng)中對流層斜延遲進行精確估計的模型。為精確估計斜延遲，引入電磁波射線描跡法，并利用Hopfield天頂延遲模型中折射率計算方案改進描跡法，以克服該方法對探空數(shù)據(jù)的依賴。首先，根據(jù)北緯35 ~37范圍內(nèi)的3個測站2010~2012年的實測氣象數(shù)據(jù)和天頂延遲數(shù)據(jù)，驗證 模型精度范圍小于35 mm；然后，將3個測站按相互基線距離的不同分為3組比對站，利用改進后的模型結(jié)合2012年的氣象數(shù)據(jù)，計算了在0~5入射角下，一年的斜延遲，并得出最大斜延遲對應(yīng)的年積日和入射角。計算結(jié)果表明，3組比對站的最大單向斜延遲為24.94~45.37 m。在雙向比對抵消90%的情況下，時間延遲為3.1~5.7 ns；相互抵消95%時，時間延遲為1.5~2.9 ns。
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關(guān)鍵詞:
- 對流層散射 /
- 斜延遲 /
- 射線描跡法 /
- Hopfield模型 /
- 折射率
Abstract: Troposphere slant delay is the main error source in two way troposphere time transfer. But there is not an accurate model to estimate the slant delay caused by tropospheric in this system. In order to estimate accurately slant delay, the method of ray tracing is presented. Computing mode of refractive index in Hopfield model is introduced to overcome the methods dependence on radiosonde data. Meteorologic data of three observation stations of 35 to 37N in 2010~2012 are selected to improve the applicability of the Hopfield model, the results suggest that precision is less than 35 mm. Then, in order to calculate the tropospheric delay under different angle of incidence (0~ 5) through modified model, three parts observation stations are distinguished by different length, modified model is used to estimate to slant delay of those parts. In the process, meteorologic data of those stations in 2012 is selected. The results suggest that max delay is 24.94~45.37 m in a single way. In two way time transfer, when the delay can counteract 90% or 95%, time delay is 3.1~5.7 ns or 1.5~2.9 ns.-
Key words:
- Tropospheric scatter /
- Slant propagation delay /
- Ray tracing /
- Hopfield model /
- Refractive index
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