Abstract
The paper describes a new method to develop a zero-type W -band radiometric receiver. The block diagram and operating algorithm of the digital control system are presented. The main advantages of the zero method in passive radio physical investigations in comparison with classical engineering solutions are shown.
Highlights
Passive thermal radio imaging systems are currently being in demand
No significant techniques were found to improve the design of radiometric receivers
That the receiver gain fluctuation has a major impact on sensitivity of these receivers
Summary
Passive thermal radio imaging systems are currently being in demand. An object can be detected by radio thermal features without active radio emission. The passive thermal radar system operates regardless of the weather and time of day as compared to the equipment based on infrared methods. These systems can be used in navigation in conditions of restricted visibility (aviation security), for radiolocation of unmanned aviation vehicles, in environmental monitoring, for medical applications and etc. Much attention has been paid to the radio systems used for imaging of objects hidden behind not optically transparent media due to increased terrorism threat [1]
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