A Method of Determining Blind Area Information of Surface Waveguide Based on Ray Tracing

Abstract

The invention discloses a method for detecting surface waveguide dead zone information based on ray tracing. The method includes the following steps that modified refractive index profile data are obtained; the calculating range including the maximum spreading distance, the largest spreading height, the height stepping value, the transmitting antenna height, the transmitting antenna initial transmitting elevation and the ray elevation interval is determined, whether rays are tracked or not is judged; the rays are tracked according to the second-order Taylor approximation mode of the Snell law, and the spreading track of each ray is obtained; whether the rays conforming to the tracking conditions are trapped or not is judged, the rays are classified, and discrete data of the rays which are transmitted out are extracted; initial position parameters of a waveguide top dead zone are obtained; the area of the surface waveguide top dead zone is calculated. According to the method for detecting the surface waveguide dead zone information based on ray tracing, a ray tracking method is introduced to judge and classify the radio wave rays, extracting and data discretization are conducted, the initial position and range of the dead zone are simply, visually and accurately obtained, the complexity of a dead zone calculating model is lowered, and therefore the area of the convection zone surface waveguide dead zone is fast calculated.

Description

Technical field [0001] The invention relates to radar detection and calculation of electric wave propagation, in particular to a calculation method for determining the blind area of ​​a surface waveguide. Background technique [0002] The actual detection of radar is restricted by its working system, signal detection capability, antenna type and other factors, and there will be a certain electromagnetic blind zone. At the same time, different detection environments will also affect its electromagnetic blind zone. This is particularly evident in the low-altitude tropospheric maritime atmosphere. Due to the sea surface, there is often an extreme abnormality of the refractive index gradient at the bottom of the troposphere, which will form an atmospheric duct, which makes a part of the electric wave trapped in the waveguide layer, the loss is reduced, and it propagates to the originally undetectable area, forming a trans-horizon propagation. But on the other hand, it will change t...

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Problems solved by technology

[0003] At present, the analysis of the electromagnetic blind zone of the tropospheric atmospheric duct at sea is mainly for the evaporation duct, and the analysis of the surface duct is still relatively limited to the explanation of existence, and there is a lack of effective quantitative calculation and analysis.

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