Monitoring of the ducting by a ground-based GPS receiver

doi:10.1088/1674-1056/22/2/029301

Abstract In this paper, we describe the estimation of low-altitude refractivity structure from simulation and real ground-based GPS delays. The vertical structure of the refractive environment is modeled using three parameters, i.e., duct height, duct thickness, and duct slope. The refractivity model is implemented with a priori constraints on the duct height, thickness, and strength, which might be derived from soundings or numerical weather-prediction models. A ray propagation model maps the refractivity structure into a replica field. Replica fields are compared with the simulation observed data using a squared-error objective function. A global search for the three environmental parameters is performed using genetic algorithm. The inversion is assessed by comparing the refractivity profiles from the radiosondes to those estimated. This technique could provide near-real-time estimation of ducting effect. The results suggest that ground-based GPS provides significant atmospheric refractivity information, despite certain fundamental limitations of ground-based measurements. Radiosondes typically are launched just a few times daily. Consequently, estimates of temporally and spatially varying refractivity that assimilate GPS delays could substantially improve over-estimates using radiosonde data alone.

Keywords: global positioning system ducting genetic algorithm radio remote sensing

Received: 29 March 2012
Revised: 02 July 2012
Accepted manuscript online:

PACS:	93.85.Ly	(Exploration of oceanic structures)
	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 41105013); the National Natural Science Foundation of Jiangsu Province, China (Grant No. BK2011122); the Specialized Research Fund for State Key Laboratories, China (Grant No. 201120FSIC-03); and the City Meteorological Scientific Research Fund, China (Grant No. IUMKY&UMRF201111).

Corresponding Authors: Fang Han-Xian
E-mail: 19994035@sina.com

Cite this article:

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

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