Secondary scattering characteristic simulation method of SAR image

Abstract

The invention discloses a secondary scattering characteristic simulation method of an SAR image. The method comprises the specific steps that 1, a three-dimensional imaging scene is built by using a three-dimensional model of an architecture target; 2, all triangular facets in the three-dimensional imaging scene are endowed with different microwave scattering attributes; 3, an interaction processof electromagnetic waves and the architecture target is simulated by using a ray-tracing algorithm, and simulated echo signals are generated; 4, the generated simulated echo signals are mapped to an SAR image plane, and a secondary scattering characteristic image is generated. According to the secondary scattering characteristic simulation method of the SAR image, based on the given three-dimensional imaging scene, echo signal characteristics of secondary scattering between the electromagnetic waves and the target are simulated, and a secondary scattering characteristic simulated image is generated; the secondary scattering characteristic simulation method of the SAR image can meet requirements of imaging mechanism analysis, target identification and parameter extraction of the SAR image of the architecture target.

Description

technical field [0001] The invention relates to the application field of satellite remote sensing, in particular to a method for simulating secondary scattering characteristics of SAR images. Background technique [0002] Synthetic Aperture Radar (SAR) has all-weather, all-weather, rapid imaging capabilities that can penetrate clouds and fog, and plays an irreplaceable role in disaster emergency response and monitoring in cloudy and rainy areas, and has gradually become one of the important means of earth observation. one. Since 2007, Italy's COSMO-SkyMed, Canada's RADARSAT-2, Germany's TerraSAR-X and TanDEM-X, and China's GF-3 satellite system have been launched successively, opening the era of high-resolution spaceborne SAR. Urban object monitoring provides a large amount of SAR data. [0003] However, the special imaging method of SAR and the complexity of the target structure of the building lead to very complex SAR image features, showing image features completely dif...

AI Technical Summary

Problems solved by technology

[0005] Although many SAR image simulation techniques have emerged, the rescattering process between the electromagnetic wave and the target is very complex and cannot be accurately described by mathematical formulas and models, and the existing image simulation methods cannot effectively and accurately describe the rescattering Feature formation process to simulate accurate rescattering features

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