Statistical assessment of evaporation duct propagation

Hitney, H. V.; Vieth, R.

doi:10.1109/8.55574

Cited by 58 publications

(47 citation statements)

References 8 publications

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“…(28), the exact gradient information depends on the solutions of the forward model (3) and the adjoint model (27). Making use of the solution to the forward model and the property of the Delta function integral, the adjoint model can also be solved by the split-step Fourier algorithm: (30) and…”

Section: Solution Of the Adjoint Modelmentioning

confidence: 99%

“…The second is a linear profile with M value of 330 M-unints at sea level. The third is a statistical result from the hydrometeorological data collected at East China Sea [29], which is constructed using the Log linear evaporation duct formula given by Hitney and Vieth [30] with an evaporation duct height of 9.1 m and the M value of 339 M-units at sea level. the forward model to calculate a modeled electric field, and then using the adjoint model to calculate a corrected refractivity profile.…”

Section: Influence Of the Initial Guess Profilementioning

confidence: 99%

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Refractivity From Clutter by Variational Adjoint Approach

Zhao¹,

Huang²

2011

PIER B

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Abstract-Inferring refractivity profiles from radar sea clutter is a complex nonlinear optimization problem. Previous works treat this problem as a model parameter estimation issue by using some idealized refractivity models, such as the Log linear evaporation duct model, bilinear model, and trilinear model, to describe the synoptic structure of the real atmospheric conditions. However, these idealized models can not describe the exact information of the refractivity profile. Rather than estimating a few model parameters, this paper puts forward possibilities of retrieving the refractivity values at each point over height by variational adjoint approach for RFC measurement geometry. The adjoint model is derived from the parabolic equation method for a smooth, perfectly conducting surface and horizontal polarization conditions. Evaporation duct profiles collected at East China Sea are provided as the true refractive environment. The performance of this approach is determined via simulations and is evaluated as a function of: 1) the initial guess profile; 2) the measurement noise; and 3) the spatial samples.

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Section: Solution Of the Adjoint Modelmentioning

confidence: 99%

Section: Influence Of the Initial Guess Profilementioning

confidence: 99%

Refractivity From Clutter by Variational Adjoint Approach

Zhao¹,

Huang²

2011

PIER B

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“…First, an evaporation duct model should be selected. For thermally neutral conditions in which the air and sea temperature are equal, the modified refractivity M can be determined at any height z by the relationship [16] …”

Section: Numerical Experimentsmentioning

confidence: 99%

Influence of sea surface roughness on the electromagnetic wave propagation in the duct environment

Zhao

Huang

Fan

2010

2010 Second IITA International Conference on Geoscience and Remote Sensing

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“…Evaporation duct results from the rapid decrease of atmospheric moisture in the first few meters above sea level, which is quasipermanent present and can increase signals above diffraction levels significantly for near surface propagation at frequencies of 1 GHz and above [1][2][3]. The evaporation duct height (EDH) has been shown to be a good parameter to describe the profile of the modified refractivity versus height.…”

Section: Introductionmentioning

confidence: 99%

Retrieving Evaporation Duct Heights From Power of Ground-Based GPS Occultation Signal

Wang¹,

Wu²,

Lin³

et al. 2013

PIER M

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Abstract-Evaporation duct is a manifest phenomenon that can affect microwave propagation seriously with low elevation angles near the sea surface. As an important parameter to describe the characteristic of the evaporation duct, duct height can be estimated from radar sea echo using a technique called as "refractivity from clutter". In this study, we proposed a novel approach to estimating the evaporation duct height. The signal power received by a groundbased GPS receiver is used when the GPS satellites rise or set at the local horizon over the sea. A forward propagation model and genetic algorithm are adopted to implement this method. The performance is evaluated via numerical simulation for inferring evaporation duct with different height. The results showed that the proposed method is well effective, especially for the conditions with higher evaporation duct height.

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Statistical assessment of evaporation duct propagation

Cited by 58 publications

References 8 publications

Refractivity From Clutter by Variational Adjoint Approach

Refractivity From Clutter by Variational Adjoint Approach

Influence of sea surface roughness on the electromagnetic wave propagation in the duct environment

Retrieving Evaporation Duct Heights From Power of Ground-Based GPS Occultation Signal

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