對(duì)流層散射雙向時(shí)間比對(duì)中對(duì)流層斜延遲實(shí)時(shí)估計(jì)

劉繼業(yè); 陳西宏; 劉贊

doi:10.11999/JEIT170581

對(duì)流層散射雙向時(shí)間比對(duì)中對(duì)流層斜延遲實(shí)時(shí)估計(jì)

doi: 10.11999/JEIT170581

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(61671468, 61701525)

計(jì)量
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出版歷程
- 收稿日期: 2017-06-15
- 修回日期: 2017-11-15
- 刊出日期: 2018-03-19

Real-time Estimation of Tropospheric Slant Delay in Two-way Troposphere Time Transfer

Funds:

The National Natural Science Foundation of China (61671468, 61701525)

摘要

摘要: 對(duì)流層斜延遲是對(duì)流層散射雙向時(shí)間比對(duì)中一個(gè)重要誤差源，該文提出一種對(duì)流層散射雙向時(shí)間比對(duì)中對(duì)流層斜延遲實(shí)時(shí)估計(jì)方法。通過(guò)GPT2w模型計(jì)算測(cè)站氣象數(shù)據(jù)，克服對(duì)流層斜延遲估計(jì)中對(duì)實(shí)時(shí)氣象數(shù)據(jù)的依賴。針對(duì)Hopfield模型中固定的對(duì)流層散射頂層高，利用幾何方法計(jì)算動(dòng)態(tài)對(duì)流層散射頂層高，以解決對(duì)流層散射雙向比對(duì)的實(shí)際應(yīng)用問(wèn)題。選取日本地區(qū)3個(gè)測(cè)站，兩兩進(jìn)行比對(duì)，在驗(yàn)證Hopfield模型精度后，計(jì)算3組比對(duì)站在不同入射角和不同時(shí)間的對(duì)流層斜延遲。計(jì)算結(jié)果表明，對(duì)流層散射雙向時(shí)間比對(duì)中對(duì)流層斜延遲呈現(xiàn)出隨比對(duì)距離增大而增大，隨入射角增大而減小的特性，并且四季變化特性也比較明顯。3個(gè)比對(duì)站的對(duì)流層散射斜延遲10~35 m之間，經(jīng)比對(duì)抵消90%后的時(shí)間延遲為3.5~11.8 ns。
- 雙向時(shí)間比對(duì) /
- GPT2w模型 /
- Hopfield模型 /
- 斜延遲
Abstract: Tropospheric slant delay is a main error source in two way time transfer via tropospheric scatter communication. A method for real-time estimation of tropospheric slant in two way time transfer via tropospheric scatter communication is proposed. The meteorological data of the station are calculated by the GPT2w model to overcome the reliance on the real-time meteorological data in the estimation of tropospheric delay. In order to solve the problem of the fixed height of the top troposphere layer, the real height of the top troposphere layer is calculated by geometric method to solve the practical application. Three stations in Japan are selected and compared with each other. After verifying the accuracy of the Hopfield model, the tropospheric delay of the three groups at different angles and different time is calculated. The results show that the tropospheric slant delay in two-way troposphere time transfer increases with the increase of the distance, and decreases with the increase of the angle, and the variation characteristics of the four seasons are obvious. The tropospheric delay of the three stations is between 10~35 m, and the time delay after subtracting 90% is 3.5~11.8 ns.
- Two-way time transfer /
- GPT2w model /
- Hopfield model /
- Slant propagation delay

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