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Propagation modeling of ocean-scattered low-elevation GPS signals for maritime tropospheric duct inversion

ISSN号：1674-1056
期刊名称：《中国物理B：英文版》
时间：0
分类：TN929.5[电子电信—通信与信息系统;电子电信—信息与通信工程] P228.4[天文地球—大地测量学与测量工程;天文地球—测绘科学与技术]
作者机构：[1]School of Science, Xidian University, Xi'an 710071, China, [2]China Research Institute of Radio Wave Propagation, Qingdao 266107, China, [3]Institute of Oceanographic Instrumentation, Qingdao 266001, China
相关基金：Project supported by the National Natural Science Foundation of China （Grant Nos. 61172031 and 41175012）

作者：张金鹏[1], 吴振森[1], 赵振维[2], 张玉生[2], 王波[3]

关键词： GPS信号, 传播模型, 大气波导, 低海拔, 海上, 折射率分布, 反演, 远洋, global positioning system, ocean surface scattering, propagation modeling, tropospheric duct inversion

中文摘要：

The maritime tropospheric duct is a low-altitude anomalous refractivity structure over the ocean surface,and it can significantly affect the performance of many shore-based/shipboard radar and communication systems.We propose the idea that maritime tropospheric ducts can be retrieved from ocean forward-scattered low-elevation global positioning system(GPS) signals.Retrieval is accomplished by matching the measured power patterns of the signals to those predicted by the forward propagation model as a function of the modified refractivity profile.On the basis of a parabolic equation method and bistatic radar equation,we develop such a forward model for computing the trapped propagation characteristics of an ocean forward-scattered GPS signal within a tropospheric duct.A new GPS scattering initial field is defined for this model to start the propagation modeling.A preliminary test on the performance of this model is conducted using measured data obtained from a 2009-experiment in the South China Sea.Results demonstrate that this model can predict GPS propagation characteristics within maritime tropospheric ducts and serve as a forward model for duct inversion.

英文摘要：

The maritime tropospheric duct is a low-altitude anomalous refractivity structure over the ocean surface,and it can significantly affect the performance of many shore-based/shipboard radar and communication systems.We propose the idea that maritime tropospheric ducts can be retrieved from ocean forward-scattered low-elevation global positioning system（GPS） signals.Retrieval is accomplished by matching the measured power patterns of the signals to those predicted by the forward propagation model as a function of the modified refractivity profile.On the basis of a parabolic equation method and bistatic radar equation,we develop such a forward model for computing the trapped propagation characteristics of an ocean forward-scattered GPS signal within a tropospheric duct.A new GPS scattering initial field is defined for this model to start the propagation modeling.A preliminary test on the performance of this model is conducted using measured data obtained from a 2009-experiment in the South China Sea.Results demonstrate that this model can predict GPS propagation characteristics within maritime tropospheric ducts and serve as a forward model for duct inversion.

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