Backscattering model for crops based on L-system and coherent addition of scattered field

Due to the irregular nature, the description of the configuration and structure of crops is difficult. So in most existing microwave backscattering models for the crops, the crop structures are ignored. In this paper, Lindenmayer system (L-system) and computer graphics technique are employed to describe and generate the realistic structure of a crop. On the basis of such method, according to the physical interaction principle between electromagnetic wave and vegetation, the intensity of scattered field of each scatterer is calculated. By coherent addition of the individual scattered field of each scatterer, the total backscattered field of the crop canopy can be obtained and the backscattering coefficients can be calculated. Through calculating the backscattering coefficients of rice and maize, and comparing the calculating result with the measured data, the feasibility of this method has been primarily proved