Mathematical models for the brightness temperature of object and environment in the microwave region

A computer program for the calculation of the brightness temperature of object and environment was developed. Object and ground were modeled by flat surfaces with the panel method. The radiation of sky, ground and atmosphere as well as the pattern of the sensor antenna are described by mathematical models. The computations were carried out for a simply structured object on a lossy ground. The brightness temperature is presented as a function of the sensor position for the frequencies 11, 32, 90, and 140 GHz. With knowledge of the temperature definition of the sensors, this mode enables the discernability of objects in their environment to be deduced.