Method for calculating scattering characteristic of river ice infrared waveband
A technology of scattering characteristics and calculation methods, which is applied in the research field of infrared radiation scattering characteristics of targets and environments, can solve the problem that the calculation accuracy of scattering models is low, the characteristics of strong directional scattering and strong scattering radiation brightness of river ice are not considered, and the practicability is poor. and other problems, to achieve the effect of easy understanding, enhanced practicability, and small calculation error
Active Publication Date: 2017-10-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0012] The purpose of the present invention is to solve the problem that the scattering model in the prior art does not take into account the characteristics of strong directional scattering and strong scattering radiation brightness of the river ice when calculating the scattered radiation of the river ice, resulting in low calculation accuracy of the scattering model. For the problem of poor practicability in engineering, a calculation method for the scattering characteristics of river ice in the infrared band is provided
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[0060] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0061] In the prior art, when dealing with the scattering problem of the underlying surface including river ice, the underlying surface is usually regarded as the Lambertian underlying surface, and the scattering intensity in all directions is considered to be the same, which is a diffuse reflection model. Use the diffuse reflectance formula to calculate its diffuse radiance. In this method, the fact that the river ice has strong specular reflection is ignored, so the calculation results will have a large error, and the directional scattering radiance of the river ice cannot be calculated. The ele...
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The invention discloses a method for calculating scattering characteristic of a river ice infrared waveband, and belongs to the field of target and environmental infrared radiation scattering characteristic research. The problems that a scattering model has low calculation accuracy and low practicability in engineering because the fact that the river ice has the characteristics of strong directional scattering and strong scattering radiation brightness is not considered are solved. The method comprises the following steps: dividing BRDF on the surface of river ice into two parts, namely diffusion reflection BRDFdiff and specular reflection BRDFspec, and calculating the diffusion reflection BRDFdiff and the specular reflection BRDFspec separately to obtain the BRDF on the surface of the river ice; according to the BRDF on the surface of the river ice, the wavelength of incident solar radiation, the incident direction and the observation direction, calculating the radiation brightness after the river ice is scattered; and according to the radiation brightness, calculating the scattering radiation brightness after the scattering radiation brightness of the river ice is absorbed by atmosphere through the observation direction. The method is used for calculating the scattering radiation brightness of the river ice under solar radiation exposure during earth observation.
Description
technical field [0001] A method for calculating the scattering characteristics of river ice in the infrared band is used to calculate the scattering radiance of river ice under solar radiation irradiation during earth observation, and belongs to the research field of infrared radiation scattering characteristics of targets and environments. Background technique [0002] The infrared scattering characteristics of river ice under solar radiation play a very important role in the detection and recognition of remote sensing targets. [0003] Through the research and analysis of the river ice remote sensing data measured by the FY-3A satellite, it is found that the scattered radiation brightness of the river ice to the solar radiation is very strong, far exceeding the scattered radiation brightness of some surrounding ground objects, and the scattered radiation of the river ice Brightness has strong directional characteristics, and it has strong directional scattering. [0004] ...
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IPC IPC(8): G01N21/49G01N21/55
CPCG01N21/49G01N21/55
Inventor 杨春平周鑫万重涛彭真明
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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