Model of radio-brightness contrast of multilayer environment and for program algorithmic software for its calculation

The matter of detecting objects in the solid environment has been approached in a variety of ways over the years. The radiometric approach, essentially passive, is of interest as an alternative to the popular induction approach, active in essence, which has become dangerous to use under present conditions. Radiometric devices are detectors of radio-brightness contrast, i.e. the deviation of radio- brightness temperature characterising the radiation of the studied environment, which depends on the depth profile of its electrophysical parameters. Studying the influence of the environment structure on the resultant radiation is useful in determining the requirements and modelling the operation of radiometric devices. The main purpose of the study is to conduct a research of current publicly available imitative models and create a convenient research-based model of the radio-brightness temperature of a multilayer environment containing heterogeneity, taking into account layers' inter-reflection; to develop a software-algorithmic complex solution for calculating the radio-brightness contrast; to carry out modelling for different environments; to determine the regularities for setting the requirements for the design of radiometric devices. The model of the radio-brightness temperature of a layered medium taking into account over-reflections on the basis of the hypothesis about the direction of propagation of the layers' own radio emission has been created. A set of experiments on calculation of the surface profile of the radio-brightness contrast of different media with heterogeneities was carried out with the help of the software-algorithmic module developed under the needs of the research. The obtained data allow us to determine the maximum depth of detection of specific heterogeneities based on the sensitivity of the radiometric device. The greatest depth of detection is established for metal and plastic heterogeneities in dry sand (nearly 6 m for radiometer sensitivity 0.03 K). The results obtained from experiments allow us to describe regularities in the basis of radio-brightness contrast dynamics. In addition, the relationship between the occurrence depth of heterogeneity, radiometer parameters and parameters of the described contrast physical model of was revealed. The data of experimental calculations can be used further for designing radiometric devices taking into account the required variety of detectable heterogeneities.