Abstract—Main difference of radiometer in comparing with the receiving systems for the communication or the radar is noise character of the radiometric signal. Principal for the all receiving items is the attainment of the low noise parameters of system. According to classic theory it is principle for radiometer to expand the entrance band before the detector. In this case it is possible to reach more big value of the so named radiometric win, which is proportional to the square root from the multiplication of the entrance band with the time of a storage.
For the case of the Josephson Junction (JJ) receiver we have principal peculiarity according to the own generation of the JJ, which can be conveniently used for the simple radiometric measuring or for the creation modern passive millimeter and terahertz imaging matrix system with electronic tuning of the receiving frequency band.
Practically, JJ is the electronically monitoring mixer (correlator by math) without special heterodyne. It is better to consider JJ as a device with high nonlinearity to external electromagnetic radiation and meanwhile a device suitable as a local heterodyne signal generator. However, comparing with the traditional understanding of a local heterodyne (oscillator) such as a monochromatic generator in case of JJ, we have to deal with the reality of the noise heterodyne. Accordingly, this study presents the theoretical basis and calculation of the possible sensitivity in the radiometer (“pixel” in case of matrix) consisting in the JJ and IF amplifier in the radiometric regime.
Figure 1. Schematic representation of the frequency conversation
Alexander G. Denisov, "Wideband own generation of the Josephson Junction is principal for the sensitivity of the radiometrical devices, especially matrix (Conference Presentation)," Proc. SPIE 10634, Passive and Active Millimeter-Wave Imaging XXI, 106340K (Presented at SPIE Defense + Security: April 19, 2018; Published: 14 May 2018); https://doi.org/10.1117/12.2303808.5783332588001.
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