A nontrivial phase noise analysis method is proposed for frequency synthesizer of a passive millimeter-wave synthetic aperture\r\ninterferometric radiometer (SAIR) imager for concealed weapon detections on human bodies with high imaging rates. The\r\nfrequency synthesizer provides local oscillator signals for both millimeter-wave front ends and intermediate frequency IQ\r\ndemodulators for the SAIR system. The influence of synthesizer phase noise in different offset frequency ranges on the visibility\r\nphase errors has been systematically investigated with noise requirements drawn, and the integrated RMS phase error could\r\nrepresent uncorrelated phase noise effects in the most critical offset frequency range for visibility error control. An analytical phase\r\nnoise simulation method is proposed to guide synthesizer design. To conclude, the phase noise effects on SAIR visibility errors have\r\nbeen concretized to noise design requirements, and good agreements have been observed between simulation and measurement\r\nresults. The frequency synthesizer designed has been successfully in operation in BHU-2D-U system.
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