| 蒸发波导对GNSS海面反射信号有效散射区域的影响 |
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| 引用本文： | 刘黎军,夏俊明,白伟华,孙越强,杜起飞,骆黎明.蒸发波导对GNSS海面反射信号有效散射区域的影响[J].地球物理学报,2019,62(2):499-507. |
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| 作者姓名： | 刘黎军 夏俊明 白伟华 孙越强 杜起飞 骆黎明 |
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| 作者单位： | 1.中国科学院大学, 北京 100049;2.中国科学院国家空间科学中心, 北京 100190;3.天基空间环境探测北京市重点实验室, 北京 100190 |
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| 基金项目： | 国家重点研发计划重点专项项目（2017YFB0502800，2017YFB0502802）和国家自然科学基金青年科学基金项目（41606206，41405039，41405040，41505030）资助. |
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| 摘 要： | 蒸发波导在海洋低空的发生概率高达90%,对舰船雷达、通信等电磁系统具有重要影响.为了分析利用GNSS卫星海面反射信号的时延-相关功率波形反演蒸发波导的可行性,本文提出了GNSS卫星海面反射信号的有效散射区域的概念,并将有效散射区域内的GNSS反射信号区分为GNSS标准反射信号和GNSS波导反射信号;然后,利用射线追踪方法,仿真分析了GNSS卫星海面反射信号的有效散射区域大小对蒸发波导的关键参数——波导高度的敏感性,并分析了在时延-相关功率波形上利用反射信号的传播时延将二者分离开的可行性.结果表明,GNSS卫星海面反射信号的有效散射区域对蒸发波导高度非常敏感,对于2～25m高的GNSS反射信号接收天线,当蒸发波导的高度由0m增加至20m时,GNSS反射信号有效散射区域半径的均值可由约14km迅速扩展至约160km;采用高度角足够大的GNSS卫星可以将有效散射区内的GNSS标准反射信号与GNSS波导反射信号在时延-相关功率波形上分离开.
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| 关 键 词： | 蒸发波导 GNSS海面反射信号 射线追踪 有效散射区域 |
| 收稿时间： | 2017-11-03 |
Influence of evaporation duct on the effective scattering region of GNSS reflected signals on the sea surface |
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| LIU LiJun,XIA JunMing,BAI WeiHua,SUN YueQiang,DU QiFei,LUO LiMing.Influence of evaporation duct on the effective scattering region of GNSS reflected signals on the sea surface[J].Chinese Journal of Geophysics,2019,62(2):499-507. |
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| Authors: | LIU LiJun XIA JunMing BAI WeiHua SUN YueQiang DU QiFei LUO LiMing |
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| Institution: | 1.The university of Chinese Academy of Sciences, Beijing 100049, China;2.National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China;3.Beijing Key Laboratory of Space Environment Exploration, Beijing 100190, China |
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| Abstract: | The occurrence probability of evaporation duct, which has significant influence on the ship-borne radar, communication and other electromagnetic systems, is as great as 90% at low altitude marine atmosphere. In order to analyze the feasibility of retrieving the evaporative duct using the delay-correlation power mapping of the GNSS sea surface reflected signals, the concept of the effective scattering region of the GNSS sea surface reflected signals was proposed, and these signals in the effective scattering region were divided into GNSS standard reflected signals and GNSS duct reflected signals. Then, the sensitivity of the effective scattering region of the GNSS sea surface reflected signals to the key parameter of the duct, the evaporation duct height, was analyzed utilizing the ray tracing method. And the feasibility of separating GNSS duct reflected signals from GNSS standard reflected signals was analyzed as well. The results show that the effective scattering region of the GNSS reflected signals is very sensitive to the evaporation duct height. When the evaporation duct height increases from 0 m to 20 m, the mean effective scattering region radius could be rapidly extended from about 14 km to about 160 km with GNSS receiver antenna height varying from 2 m to 25 m. The GNSS standard reflection signals in the effective scattering region could be separated from the GNSS duct signals when the GNSS satellite's elevation angel is large enough. |
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| Keywords: | Evaporation duct GNSS sea surface reflected signal Ray tracing Effective scattering region |
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