Estimating refractivity from propagation loss in turbulent media

Estimating refractivity from propagation loss in turbulent media

This paper estimates lower atmospheric refractivity (M-profile) given an electromagnetic (EM) propagation loss (PL) measurement. Specifically, height-independent PL measurements over a range of 10–80 km are used to infer information about the existence and potential parameters of atmospheric ducts in the lowest 1 km of the atmosphere. The main improvement made on previous refractivity estimatio...

Wave propagation in turbulent media: use of convergence acceleration methods.

We propose the use of convergence acceleration methods for the evaluation of integral expressions of an oscillatory nature, often encountered in the study of optical wave propagation in the turbulent atmosphere. These techniques offer substantial savings in computation time with appreciable gain in accuracy. As an example, we apply the Levin u acceleration scheme to the problem of remote sensin...

The Moliere Approximation for Wave Propagation in Turbulent Media

Joint Inversion of Atmospheric Refractivity Profile Based on Ground-Based GPS Phase Delay and Propagation Loss

In this paper, we present a new estimation of the atmospheric refractivity profile combining the scattering signal (electromagnetic wave propagation loss) and the direct signal (phase delay). The refractivity profile is modeled using four parameters, i.e., the gradient of the refractivity profile (c1, c2) and the vertical altitude (h1, h2). We apply the NSGA-II (Non-dominated Sorting Genetic Al...

Reaction front propagation in a turbulent flow.

The propagation of reaction fronts in a turbulent fluid flow is studied by direct numerical simulations in two space dimensions. The velocity field is obtained from integrating the Navier-Stokes equation in two dimensions. We investigate the structure of the reaction front and the enhancement of the front propagation speed due to turbulent mixing. Consistently with earlier theoretical, predicti...