Radiometric discriminator is the simplest device for comparing the radiometric brightness temperature of two following spots of antenna beam on the observed remote scene. In this case, the real signal from discriminator can be similar to the radar imaging in form of the bright points based on the difference between the metal object and the background of an absorbing or semi-absorbing environment. To realize the function of finding objects, the scanning antenna is symmetrically decided into two parts. This signal arises only when the two parts generate different levels of brightness temperatures because of a target captured in alternative pixel scanning along the observed scene. In this paper, the device named discriminator is proposed, and the operating principle and possible application is introduced for the object with Stealth coating.
Hao Liu, Jinghui Qiu, Xinyu Yin, and Alexander Denisov, "Simplest passive millimeter wave discriminator for the finding of objects," Proc. SPIE 10103, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X, 1010308 (Presented at SPIE OPTO: January 30, 2017; Published: 24 February 2017); https://doi.org/10.1117/12.2249237.
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