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

doi:10.1088/1674-1056/21/10/109202

Abstract 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.

Keywords: global positioning system ocean surface scattering propagation modeling tropospheric duct inversion

Received: 28 February 2012
Revised: 14 May 2012
Accepted manuscript online:

PACS:	92.60.Cc	(Ocean/atmosphere interactions, air/sea constituent fluxes)
	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61172031 and 41175012).

Corresponding Authors: Wu Zhen-Sen
E-mail: wuzhs@mail.xidian.edu.cn

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Zhang Jin-Peng (张金鹏), Wu Zhen-Sen (吴振森), Zhao Zhen-Wei (赵振维), Zhang Yu-Sheng (张玉生), Wang Bo (王波) Propagation modeling of ocean-scattered low-elevation GPS signals for maritime tropospheric duct inversion 2012 Chin. Phys. B 21 109202

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[1]	Monitoring of the ducting by a ground-based GPS receiver Sheng Zheng (盛峥), Fang Han-Xian (方涵先). Chin. Phys. B, 2013, 22(2): 029301.

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

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