Method for inverting atmospheric waveguide based on radar echo data of electromagnetic wave parabolic equation adjoint mode

Abstract

The invention discloses a method for inverting an atmospheric waveguide based on radar echo data of an electromagnetic wave parabolic equation adjoint mode, which specifically comprises the steps of: describing a waveguide through employing a parameterized model function according to the characteristics and causes of the atmospheric waveguide; determining a mathematical model of electromagnetic wave one-way propagation loss and simulated radar echo power in actual atmosphere; establishing a mathematical model of a target function by using the actually measured radar echo power and the simulated radar echo power; and inverting the gradient of the parameters of the atmospheric waveguide relative to the target function by using the established target function and adopting an adjoint algorithm, and then inverting the parameters of the atmospheric waveguide by a gradient descent algorithm. Therefore, the number of times of running a forward modeling mode in the inversion calculation is reduced, the calculation time of the forward modeling mode is greatly shortened, guarantee is provided for the real-time performance of the inversion calculation, and the real-time performance of the inversion is improved. During inversion, the inversion parameters can be converged well only by a small number of iterations, and the inversion precision can be improved along with the increase of the number of iterations.

Description

technical field [0001] The invention belongs to the technical fields of atmospheric science and meteorological radar, in particular to a method for inverting atmospheric waveguide based on radar echo data of the electromagnetic wave parabolic equation adjoint mode. Background technique [0002] The performance design and evaluation of radio electromagnetic communication systems such as radar are usually based on the standard atmospheric refraction mode, and the atmospheric duct is an abnormal atmospheric refraction structure that frequently appears in the atmospheric boundary layer. It can not only make electromagnetic waves deviate from the original propagation direction, but also It can make the electromagnetic wave propagate beyond the line of sight with a small attenuation, which seriously affects the working performance of the radio communication system. Such as figure 1 It shows that there are usually three types of atmospheric ducts in the marine atmosphere environme...

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Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a method for inverting atmospheric waveguide from radar echo data based on the electromagnetic wave parabolic equation propagation mode, to solve the existing electromagnetic wave parabolic The calculation time of the equation propagation model is long, and the forward modeling model needs to be repeatedly run repeatedly in the inversion implementation process, and the problems of real-time inversion and low accuracy in the stratified non-uniform waveguide structure in the atmospheric environment

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