Fast Realization method for simulation 3D scene SAR radar echo based on forward method

Abstract

The invention discloses a fast Realization method for simulation 3D scene SAR radar echo based on forward method. The main idea of the fast Realization method comprises the following steps: acquiring digital elevation model (DEM) data within SAR radar beam range, wherein the data comprises K point targets; randomly distributing the K point targets on a 2D ground in the geographic coordinate system, and calculating DEM data within the SAR radar beam range after refinement processing; acquiring back scattering property distribution of the DEM data within the SAR radar beam range after refinement processing; utilizing an improved downward angle comparison method to determine shaded areas of Q small surface elements, calculating final actual back scattering coefficients of the Q small surface elements after shaded area determination, and then calculating SAR radar echo of the Q small surface elements. At this time, the whole 3D scene echo simulation is completed in a graphic processing unit (GPU), and finally an echo signal in the GPU is sent to a CPU processor to be output.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a method for quickly realizing SAR radar echoes imitating three-dimensional scenes based on a forward method, which is suitable for the simulation of three-dimensional terrain SAR radar echoes in large scenes. Background technique [0002] Synthetic Aperture Radar (SAR) can observe targets or scenes all-weather and all-weather, and has huge application space in disaster monitoring, resource exploration, especially in military and civilian fields. With the increasing development of Synthetic Aperture Radar (SAR) technology, when verifying and evaluating new SAR design schemes and imaging algorithms, SAR echo signals that meet specific parameters are required, which cannot be obtained directly through radar echo acquisition, so it is necessary to conduct SAR echo simulation work; SAR echo simulation is divided into reverse method and forward method. Amon...

AI Technical Summary

Problems solved by technology

[0003] However, when performing forward normal echo simulation on a large 3D ground scene target, the first difficulty is how to effectively simulate the process of backscattering

There are many methods for the calculation of electromagnetic scattering, such as physical optics method, geometric diffraction method, etc., all of which involve specific scattering mechanisms, and the solution process is relatively difficult; considering that the synthetic aperture radar often takes the ground scene as the observation object, it can be used The reference value of the backscatter coefficient is estimated by combining the measured data with factors such as the radar operating frequency and the beam ray side angle. The amount of calculation involved is also huge. In addition, there are also how to judge shadow occlusion and how to simulate the echo of a large scene. issues such as rapid implementation

Images