A Fast Calculation Method for Compound Scattering of Ultra-Low Altitude Target and Rough Surface of Earth and Sea

Abstract

The invention discloses a quick calculation method of super-low-altitude target and land-sea rough surface composite scattering. The method comprises the following steps: acquiring a central position of an irradiated area of a land-sea rough surface; acquiring back scattering RCS (Radar Cross-Section) value of a plurality of target mirror image strong scattering points by the high-frequency asymptotic method; calculating the scattering contribution of the target related to the land-sea rough surface mirror; arranging the observing position to the level under the target irradiated area; calculating the double-station scattering RCS value of a plurality of target double-station strong scattering points; calculating the scattering contribution of the land-sea rough surface related to the local target mirror image while calculating vertical incidence according to the kirchhoff approximation principle; combining and calculating the main composite scattering contribution of a super-low-altitude target and the land-sea rough surface to obtain the composite scattering RCS value. According to the method, the strong scattering points are introduced into the composite multi-scattering calculation of a near field target and the rough surface, and thereby, the calculation amount of the coupling scattering of the target and a land-sea surface is decreased; meanwhile, the application is not limited to a flat land-sea surface, and highly undulated land-sea rough surfaces also apply.

Description

technical field [0001] The invention relates to a technology for calculating and acquiring electromagnetic scattering characteristics of a target, in particular to a fast calculating method for compound scattering of an ultra-low-altitude target and a rough surface of the earth and sea. Background technique [0002] For ultra-low-altitude flying targets or ground-sea targets, target scattering echoes and ground-sea background echoes will be mixed with each other, and there is a strong compound multiple scattering between the target and the ground-sea surface, and the target echo signal is usually submerged by the ground-sea clutter , which will greatly affect the detection of the target, and it is necessary to study the compound scattering characteristics of the target and the ground-sea surface in depth. As one of the main means to obtain the above characteristics, simulation calculation is one of the main hotspots of electromagnetic scattering modeling at home and abroad in...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a fast calculation method for compound scattering of ultra-low-altitude targets and rough sea-earth surfaces, which is used to solve the problem of slow calculation speed of compound scattering of near-field ultra-low-altitude targets and rough sea-earth surfaces in the prior art, which is difficult to meet engineering requirements. Application Requirements Questions

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