"A Mathematical Model for Generating a Radiothermal Profile of Surface and Airborne Objects and its Computer Implementation"

"Stricter requirements for the accuracy and reliability of search, detection, guidance, and navigation systems necessitate the integrated use of information channels of various physical natures in such systems. The development of microwave radiometry allows for the use of a passive millimeter-wave thermal radio channel as one such channel. When developing such a channel to assess the feasibility and probability of detecting and targeting various surface and airborne targets, obtaining the necessary thermal radio channel parameters, and ensuring the highest probability of detecting an object against various backgrounds, experimental studies are necessary for specific samples of detectable objects with variations in background, hydrometeorological conditions, angular position, and range relative to the observer. Full-scale experiments of this kind are extremely resource-intensive. The goal of this work is to develop mathematical and software tools that will replace full-scale experiments with numerical ones and calculate thermal radio portraits of objects, taking into account their position and background, as well as the object\u2019s radio brightness contrast. Expressions were obtained for the bright-ness temperatures of atmospheric and sea surface thermal radiation along target sighting paths in various angular ranges. These expressions form the basis for a mathematical model of the thermal field and the formation of a thermal image of the observed object. The resulting computer model allows for calculating the thermal field of surface and airborne objects at any point in space, constructing thermal imagery of objects against different backgrounds, at different angular orientations and ranges, taking into account the emissivity of the materials of individual hull elements, using 3D models of the objects in OBJ format. The developed models are useful for developers of integrated search, detection, guidance, and navigation systems in determining the necessary thermal imagery channel parameters for various targets against different backgrounds."