Simulation method of vertical backscattering coefficient of non-uniform vegetation canopy in high orbit SAR

Abstract

The invention relates to a high-orbit SAR vertical heterogeneous vegetation canopy backscattering coefficient simulation method. The method comprises following steps of determining the type of each vegetation canopy assembly; determining the vertical distribution function of the density of each vegetation canopy assembly; calculating a thin layer backscattering matrix in a double matrix algorithm; and calculating the backscattering coefficient of a vegetation canopy. According to the invention, by introducing the vertical distribution function of the density of each vegetation canopy assembly into the double matrix algorithm and then carrying out backscattering coefficient simulation, an approach is provided for research of effects on backscattering coefficient by the vertical heterogeneity of the vegetation canopy, and the method is especially suitable for high-orbit SAR observation.

Description

technical field [0001] The invention relates to the research field of vegetation radar remote sensing observation, in particular to a method for simulating the backscatter coefficient of vertical non-uniform vegetation canopy by high-orbit SAR. Background technique [0002] Vegetation canopy backscatter coefficient simulation technology is used to explain the interaction between radar electromagnetic waves and vegetation canopy, which can assist in the development of vegetation canopy parameter inversion technology and carry out research on vegetation space observation technology based on radar remote sensing. The current numerical calculation model of the vegetation canopy backscatter coefficient mostly assumes that the vegetation canopy is vertically uniform, and lacks the description of the vertical non-uniformity of the vegetation canopy. However, there is extensive vertical heterogeneity in the vegetation canopy in nature. The assumption of uniformity limits the ability...

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Problems solved by technology

However, there is extensive vertical heterogeneity in the vegetation canopy in nature. The assumption of uniformity limits the ability of the vegetation backscatter coefficient model to be used for theoretical analysis, and it is impossible to make accurate predictions on the interaction mechanism between microwave electromagnetic waves and vegetation. explain

[0003] It can be seen that the above-mentioned existing vegetation canopy backscatter coefficient simulation method obviously still has inconvenience and defects in the method and use, and needs to be further improved, especially the use of high-orbit synthetic aperture radar (SAR) ) observations, since it is located in a geosynchronous orbit at an altitude of 360,000 km, higher requirements are placed on the observation of vegetation vertical inhomogeneity

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