A Target Stealth Method for Sea Surface Evaporating Waveguide Over-the-horizon Detection Radar

Abstract

The invention provides an object stealth method for a sea surface evaporation waveguide beyond-the-horizon detection radar. The method comprises the following steps: measuring atmosphere parameters of surrounding environment of an object to be stealthy, and determining evaporation waveguide parameters; according to a ray equation, calculating an electric wave ray locus in an evaporation waveguide; and calculating an edge ray skip distance capable of realizing evaporation waveguide beyond-the-horizon propagation, determining a wave beam locus skip distance, disposing coherent sound source array in the scope of K times of the wave beam locus skip distance around the object to be stealthy, through sound pressure distribution generated by sound wave interference, an atmospheric refraction index spatial distribution structure of the atmosphere around the object to be stealthy is changed, and signals of the beyond-the-horizon detection radar are enabled to be not effectively spread to an object to be detected and return to the detection radar. According to the invention, by use of a round wave interference principle, the sound pressure distribution with a specific structure is generated in a sea surface evaporation waveguide environment, evaporation waveguide characteristic parameters are changed or an evaporation waveguide structure is damaged, a beyond-the-horizon detection radar system based on an evaporation waveguide environment cannot detect the object effectively, and effective stealth is realized.

Description

technical field

[0001] The invention relates to radar target detection technology, in particular to a target stealth method for sea surface evaporation waveguide over-the-horizon detection radar. Background technique

[0002] Atmospheric waveguide is an abnormal atmospheric structure different from the standard atmosphere formed because the refractive index of the atmosphere decreases rapidly with height. It can make the electromagnetic wave rays bend downward with a curvature greater than the curvature of the earth's surface, thus trapping electromagnetic energy in the waveguide structure. Atmospheric waveguide propagation is formed inside. In the space of tens of meters close to the sea surface, the double interaction between seawater and the atmosphere in the surface layer of the atmosphere makes the change of the atmospheric structure more severe. The evaporation waveguide is a form of atmospheric waveguide that frequently appears in the marine environment.

[0003] The...

Examples

Embodiment Construction

[0039]The present invention will be described in detail below in conjunction with the accompanying drawings. When describing the embodiments of the present invention in detail, for the convenience of explanation, the accompanying drawings showing the structure of the device will not be partially enlarged according to the general scale, and the schematic diagram is only an example, and it should not be limited here. The protection scope of the present invention. It should be noted that all the drawings are in very simplified form and use imprecise scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0040] Such as figure 1 Shown: When the gradient of the atmospheric refraction index N varying with height in a certain space above the sea satisfies dN / dhc , and when the emission angle satisfies specific conditions, the radio wave can achieve a propagation mode similar to that in a metal waveguide and ...

technical field

[0001] The invention relates to radar target detection technology, in particular to a target stealth method for sea surface evaporation waveguide over-the-horizon detection radar. Background technique

[0002] Atmospheric waveguide is an abnormal atmospheric structure different from the standard atmosphere formed because the refractive index of the atmosphere decreases rapidly with height. It can make the electromagnetic wave rays bend downward with a curvature greater than the curvature of the earth's surface, thus trapping electromagnetic energy in the waveguide structure. Atmospheric waveguide propagation is formed inside. In the space of tens of meters close to the sea surface, the double interaction between seawater and the atmosphere in the surface layer of the atmosphere makes the change of the atmospheric structure more severe. The evaporation waveguide is a form of atmospheric waveguide that frequently appears in the marine environment.

[0003] The...

Examples

Embodiment Construction

[0039]The present invention will be described in detail below in conjunction with the accompanying drawings. When describing the embodiments of the present invention in detail, for the convenience of explanation, the accompanying drawings showing the structure of the device will not be partially enlarged according to the general scale, and the schematic diagram is only an example, and it should not be limited here. The protection scope of the present invention. It should be noted that all the drawings are in very simplified form and use imprecise scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0040] Such as figure 1 Shown: When the gradient of the atmospheric refraction index N varying with height in a certain space above the sea satisfies dN / dhc , and when the emission angle satisfies specific conditions, the radio wave can achieve a propagation mode similar to that in a metal waveguide and ...

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