改進(jìn)射線描跡的低仰角散射斜延遲實(shí)時(shí)估計(jì)

吳文溢; 鐘方平; 王萬鵬; 陳西宏; 朱丹

doi:10.11999/JEIT190014

改進(jìn)射線描跡的低仰角散射斜延遲實(shí)時(shí)估計(jì)

doi: 10.11999/JEIT190014

1.
西北核技術(shù)研究所西安 710024
2.
空軍工程大學(xué)防空反導(dǎo)學(xué)院西安 710051

基金項(xiàng)目: 國家自然科學(xué)基金(611701525)

詳細(xì)信息

作者簡介:
吳文溢：男，1993年生，工程師，碩士，研究方向?yàn)楦呔葧r(shí)間同步技術(shù)研究

鐘方平：男，1966年生，研究員，博士生導(dǎo)師，研究方向?yàn)楣こ塘W(xué)

王萬鵬：男，1975年生，高級(jí)工程師，研究方向?yàn)楸W(xué)

陳西宏：男，1964年生，教授，博士生導(dǎo)師，研究方向?yàn)榇笕萘可⑸渫ㄐ偶夹g(shù)

朱丹：女，1982年生，工程師，研究方向?yàn)楣こ谭雷o(hù)

通訊作者:
吳文溢　18092161443@qq.com

中圖分類號(hào): TN011
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出版歷程
- 收稿日期: 2019-01-07
- 修回日期: 2019-04-23
- 網(wǎng)絡(luò)出版日期: 2019-04-29
- 刊出日期: 2019-10-01

Real-time Estimation of Tropospheric Scattering Slant Delay of Low-elevation Obtained by Improved Ray Tracing

1.
Northwest Institute of Nuclear Technology, Xi’an 710024, China
2.
Air and Missile Defense College, Air Force Engineering University, Xi’an 710051, China

Funds: The National Natural Science Foundation of China (611701525)

摘要

摘要: 針對(duì)任意測站的對(duì)流層散射斜延遲估算時(shí)存在探空氣象數(shù)據(jù)不易實(shí)時(shí)獲取的不足，該文提出一種利用地面氣象參數(shù)內(nèi)插改進(jìn)射線描跡計(jì)算公式的對(duì)流層散射斜延遲估計(jì)算法。該算法利用中緯度大氣氣象參數(shù)公式推導(dǎo)了折射指數(shù)隨地心距變化的關(guān)系式，并采用氣象參數(shù)內(nèi)插方法獲取溫度變化率和水汽壓變化率，克服了射線描跡法對(duì)探空數(shù)據(jù)的依賴。根據(jù)亞洲地區(qū)6個(gè)國際GPS服務(wù)(IGS)測站2012年的實(shí)測氣象數(shù)據(jù)，驗(yàn)證了該文算法解算天頂延遲年平均偏差的絕對(duì)值在1 cm以內(nèi)；選取基線距離適宜的3個(gè)測站分成3組散射通信比對(duì)站，利用射線描跡法計(jì)算了其在0°～5°入射角下全年的斜延遲，結(jié)果表明，3組比對(duì)站進(jìn)行單向傳輸?shù)淖畲笮毖舆t為17.03～33.10 m；進(jìn)行雙向時(shí)間比對(duì)相互抵消95%時(shí)，時(shí)間延遲為2.88～5.52 ns。
- 對(duì)流層散射 /
- 斜延遲 /
- 射線描跡法 /
- 折射指數(shù)
Abstract: Considering the disadvantage of oblique delay estimation of tropospheric scattering at arbitrary stations, which is difficult to obtain real-time sounding meteorological data, an oblique delay estimation algorithm of tropospheric scattering based on improved ray tracing method with ground meteorological parameters is proposed. In order to get rid of the method’s dependence on radiosonde data, the algorithm infers the relationship between refractive index and altitude through the formula of meteorological parameters in the model of medium latitude atmosphere. The interpolation of meteorological parameters in the model of UNB3m is used to gain the coefficient of temperature and water vapor pressure. Meteorological data for 2012 from 6 International GNSS Service (IGS) stations in Asia are selected to test the applicability of new method, the results suggest that precision is less than 1 cm. Then, the tropospheric slant delays of three parts observation stations under different angles of incidence (0°～5°) are calculated by the modified algorithm. The results suggest that the maximum delay is 17.03～33.10 m in a single way time transfer. In two way time transfer, when the delay can counteract 95%, time delay is 2.88～5.52 ns.
- Tropospheric scatter /
- Slant propagation delay /
- Ray tracing /
- Refractive index

HTML全文

圖 1 射線描跡法示意圖

下載: 全尺寸圖片幻燈片

圖 2 對(duì)流層散射通信原理簡化圖

下載: 全尺寸圖片幻燈片

圖 3 測站平均偏差分布直方圖

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圖 4 對(duì)流層散射斜延遲

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圖 5 最大延遲時(shí)刻對(duì)流層散射斜延遲隨入射角變化圖

下載: 全尺寸圖片幻燈片

圖 6 0°入射角下一年對(duì)流層散射斜延遲變化圖

下載: 全尺寸圖片幻燈片

表 1 氣象參數(shù)格網(wǎng)值

$F{(^ \circ })$	avg		amp
$F{(^ \circ })$	$\beta $	$\lambda $	$\beta $	$\lambda $
15	0.00630	2.77	0.000	0.000
30	0.00605	3.51	0.00025	0.33
45	0.00558	2.57	0.00032	0.46
60	0.00539	1.81	0.00081	0.74
75	0.00453	1.55	0.00062	0.30

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表 2 測站信息

站名	北緯($^\circ $)	東經(jīng)($^\circ $)	海拔(m)
TSKB	36.11	140.09	67.30
KSMV	35.96	140.66	57.93
KGNI	35.71	139.49	123.50
BJFS	39.36	115.53	54.70
WUHN	30.31	114.21	27.00
TWTF	24.95	121.16	203.10

下載: 導(dǎo)出CSV

表 3 各模型統(tǒng)計(jì)結(jié)果(cm)

測站	UNB3m模型		EGNOS模型		本文算法
測站	平均偏差	RMS	平均偏差	RMS	平均偏差	RMS
TSKB	–0.69	8.57	0.63	8.64	–0.70	7.57
KSMV	–0.60	8.44	0.77	8.53	–0.77	7.93
KGNI	–0.67	7.80	0.79	7.89	–0.69	7.41
BJFS	–0.53	7.65	0.72	8.23	–0.56	7.32
WUHN	–0.59	7.53	0.66	8.44	–0.66	7.44
TWTF	–0.80	8.62	0.78	8.65	–0.79	7.85

下載: 導(dǎo)出CSV

表 4 比對(duì)站情況表

比對(duì)站	A&B	A&C	B&C
L(km)	53.96	70.06	109.19
${\theta _0}$($^\circ $)	$[0, 5)$	$[0, 5)$	$[0, 5)$

下載: 導(dǎo)出CSV

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