基于改進(jìn)射線描跡法的對(duì)流層斜延遲估計(jì)

陳西宏; 吳文溢; 劉贊

doi:10.11999/JEIT160023

基于改進(jìn)射線描跡法的對(duì)流層斜延遲估計(jì)

doi: 10.11999/JEIT160023

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(61172169)

計(jì)量
- 文章訪問(wèn)數(shù): 1322
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2016-01-11
- 修回日期: 2016-06-06
- 刊出日期: 2016-10-19

Estimation of Tropospheric Slant Delay Based on Improved Ray Tracing Method

Funds:

The National Natural Science Foundation of China (61172169)

摘要

摘要: 該文針對(duì)傳統(tǒng)對(duì)流層延遲模型和射線描跡法在估計(jì)對(duì)流層延遲方面的局限性，如效率低、成本高、精度受地表參數(shù)和探空數(shù)據(jù)限制等不足，提出一種基于改進(jìn)射線描跡法的對(duì)流層斜延遲估計(jì)方法。該方法結(jié)合中緯度大氣模式氣象參數(shù)公式和UNB3m氣象參數(shù)模型，改進(jìn)了射線描跡法中折射率剖面的計(jì)算，克服了氣象數(shù)據(jù)對(duì)射線描跡法的限制。選取亞洲地區(qū)10個(gè)站點(diǎn)2012年的氣象數(shù)據(jù)，分別采用改進(jìn)射線描跡法和傳統(tǒng)對(duì)流層延遲模型估計(jì)各個(gè)站天頂方向至高度角區(qū)間15個(gè)方向的對(duì)流層斜延遲，并與基于探空數(shù)據(jù)獲取的對(duì)流層斜延遲真值進(jìn)行比較，計(jì)算結(jié)果表明該方法的估計(jì)精度優(yōu)于傳統(tǒng)對(duì)流層延遲模型，為非氣象數(shù)據(jù)情況下對(duì)流層斜延遲實(shí)時(shí)估計(jì)提供了新的思路。
- 無(wú)線電探空 /
- 對(duì)流層斜延遲 /
- 射線描跡法 /
- UNB3m模型 /
- 折射率
Abstract: The tradition tropospheric delay models and the method of ray-tracing have some limits like inefficiency, high cost and the the restrictions of radiosonde data and surface parameters. An improved method based on ray tracing is proposed. In this method, meteorological parameter formulas in the middle latitude model and meteorological parameter models in UNB3m model are combined to modify the arithmetic of refractive index, which gets rid of the restrictions of radiosonde data. Meteorological data from 10 Asia stations in 2012 are analyzed based on ray tracing technology and tradition models like Hopfield and Saastamoinen. Slant delays for 15 directions, from the zenith to elevations, are computed. The results are compared with ray-tracing tropospheric slant delays from nearby radiosonde measurements, which demonstrates that the accuracy of improved ray tracing method is superior to tradition models, and the proposed method provides a new real time way for estimating tropospheric slant delay in the case of lack of meteorological data.
- Radiosonde /
- Tropospheric slant delay /
- Ray tracing /
- UNB3m model /
- Refractive index

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