Inversion Method of Effective Microwave Permittivity of Large-scale Materials Based on Microwave Radiometer

Abstract

The invention discloses a method for retrieving the effective microwave dielectric constant of a large-scale material based on a microwave radiometer. The effective microwave dielectric constant of a large-scale solid material sample is obtained by inverting a large-scale solid material sample through an experimental test, which is beneficial to Establish a physical model of microwave radiation remote sensing for large-scale solid materials, thereby improving the interpretation and analysis accuracy of microwave remote sensing data; And the effective microwave dielectric constant of solid material samples obtained by inversion has high application value. The "environment-test sample-blackbody" observation system A and the "environment-test sample-aluminum plate" observation system B constructed by the present invention have strict and clear boundary conditions for both the blackbody material and the aluminum plate material in microwave radiation transmission, thus The effective microwave dielectric constant of large-scale solid material samples obtained by inversion has high reliability.

Description

technical field [0001] The invention relates to the technical field of dielectric testing of solid materials, in particular to a microwave radiometer-based effective microwave dielectric constant inversion method for large-scale materials. Background technique [0002] When passive microwave remote sensing technology is used to observe the ground, the microwave dielectric properties of ground objects (including solid materials such as rocks, concrete, and slab soil) are important factors that affect the microwave emissivity of ground objects, and then affect the brightness temperature of microwave radiation; The difference in microwave dielectric properties is also the key theoretical basis for using microwave remote sensing data to identify surface object types. Therefore, understanding and measuring the microwave dielectric properties of ground objects is an important basis for the development of satellite passive microwave remote sensing applications. [0003] At present...

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Problems solved by technology

[0004] 1) The coaxial probe method, transmission line method and resonant cavity method are generally used to test the microwave dielectric properties of rock samples with small size (a few millimeters to a few centimeters) and no significant structural features, while for larger size (decimeter or meter The material sample of the scale) may have significant structural features, so the test results obtained by conventional testing methods have certain limitations, and cannot effectively reflect the macroscopic dielectric properties of the entire large-scale test block.

[0005] 2) Although the space wave method can reflect the overall microwave dielectric properties of large-sized solid materials, the construction of the space wave method experimental test platform is very complicated, and the test environment requirements are extremely high, otherwise the test accuracy is too low, so the test cost of this method Higher, using the space wave method to test the microwave dielectric properties of rock samples needs to consider many aspects of technology, economy, efficiency and other issues

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