Imaging technologies and applications of microwave radiometry

Microwave radiometry deals with the measurement of the natural thermally caused electromagnetic radiation of matter at a physical temperame above OK. For imaging purposes no transmitter is needed as in the case of a radar, but the receiver requires a very low noise figure because the signals to he measured are in the same order of magnitude as its own noise. Likewise the thermal radiation itself has a statistical character and for the most purposes it can be mathematically described by white Gaussian noise with zero mean.