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Radar cross-section layered calculation method of ship target within atmospheric duct range

A technology of radar cross section and atmospheric waveguide, which is applied in the calculation field of radar cross section

Inactive Publication Date: 2011-10-26
NAVAL UNIV OF ENG PLA
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Problems solved by technology

[0004] The purpose of the present invention is to solve the layered calculation problem of RCS scattering characteristics encountered in microwave over-the-horizon radar technology development, equipment update and combat operation, and provide effective layered calculation of ship target RCS scattering characteristics in the range of atmospheric waveguide method

Method used

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  • Radar cross-section layered calculation method of ship target within atmospheric duct range
  • Radar cross-section layered calculation method of ship target within atmospheric duct range
  • Radar cross-section layered calculation method of ship target within atmospheric duct range

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specific Embodiment

[0077] Assuming that for a certain type of ship target, first use 3DSMAX three-dimensional modeling software for geometric modeling, set the radar observation frequency to 9GHz, and the ship’s random swing angle on the sea surface to 3 degrees, then the target geometric model is divided The step length can be selected as l=1m (at this time klγ 0 ≈9>>1 satisfies the incoherent condition). Perform a simple geometric approximation for each divided part, and then determine the target occluded surface. Use 3DSMAX software to export the unoccluded part to a certain dihedral angle in the geometric model of the ship (name: twoangle rl 13) As an example, the specific format of the exported ASE file is:

[0078]

[0079]

[0080] Calculate the RCS value of each derived component. At this time, if each component is incoherently superimposed according to the height, for example, the height is selected as 1 meter, and the average RCS is fitted with the height after incoherent superposition ac...

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Abstract

The invention discloses a radar cross-section (RCS) layered calculation method of a ship target within an atmospheric duct range. According to the invention, after partition of a three-dimensional geometric model of a ship target, most similar basic geometrical shapes of the all partitioned parts of the three-dimensional geometric model are selected and are approximated as basic scatterers; geometric information of all basic scatterers are extracted and RCSs of the all basic scatterers are calculated; Change relations of RCS values of all parts of the ship target at different heights are calculated by combining heights of all parts of the ship target; and scattering power intensity of the ship target is calculated according to a transmission factor of an electromagnetic wave of an atmospheric duct. According to the RCS calculation method of the ship target within the atmospheric duct range provided in the invention, computational complexity and requirements for computing equipment canbe substantially reduced and real-time calculation is allowed. Besides, an influence of up-and-down sea surface on transmission of an electromagnetic wave is fully considered, and a calculation result is more reasonable and effective. The method provided in the invention has important military significances for technological development, equipment update, and operational application of microwave beyond-the-horizon radar.

Description

Technical field [0001] The invention relates to a calculation method of radar cross section, in particular to a layered calculation method of radar cross section of a target object in an atmospheric duct. Background technique [0002] As a long-range detection equipment, radar has now become an important means of battlefield surveillance and information acquisition for our military. However, the curvature of the earth severely limits the line-of-sight detection range of ground-based radars. To detect long-range targets beyond line-of-sight, it is necessary to develop and equip a radar system with beyond-the-horizon detection capabilities. For the long-range detection of ship targets on the sea, microwave over-the-horizon radar, which relies on atmospheric duct conditions, has obvious advantages and has become an important development direction for sea over-the-horizon radar equipment. The research on the scattering characteristics of ship targets in the atmospheric duct plays a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 席泽敏卢建斌张明敏
Owner NAVAL UNIV OF ENG PLA
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