The paper presents the concept of passive detection of moving targets based on thermal radiation in microwave region. Up to now the passive detection of moving targets, especially airplanes and ground vehicles is performed using infrared sensor. The microwave radiometric methods are now widely used in many other fields of applications, such as radio astronomy, remote sensing, medicine, pollution control, mine detection and other. All these methods are based on measurement of power of thermal noise radiated by hot surface. The usage of power-only information is usually not sufficient to discriminate between moving and stationary target. To sense the target movement different phenomena can be applied. The most fundamental one is Doppler shift of the spectrum of radiating thermal noise. To perform this task complex envelope of received signal must be recorded and Doppler processing must be applied. The Doppler and time correlations are widely used in radio astronomy, for sensing the weather and for high-resolution image creation, but up to now was not exploited for moving target indication, so important in ATC applications. The fundamental problem - distinction between stationary and moving targets is performed by calculating range-Doppler correlation between thermal signals obtained from different localization in multi-static radiometric antenna constellation. Further more, using correlation principles, it is possible to obtain high resolution images of the detected objects.