%0 Journal Article
%T Application Concept of Zero Method Measurement in Microwave Radiometers
%A Alexander V. Filatov
%J Modern Instrumentation
%P 19-31
%@ 2165-9273
%D 2015
%I Scientific Research Publishing
%R 10.4236/mi.2015.43003
%X This article examined in detail microwave radiometer functioning algorithm with synchronously using of the two types of pulse modulation: amplitude pulse modulation and pulse-width modulation. This allows a zero-radiometer measurement method to realize when the fluctuation effect of the receiver gain and the influence of its own noise changes are minimized. A zero balance automatically maintains in radiometer. The antenna signal is indirectly determined through the signal duration that controls the pulse-width modulation. An analytical expression of the fluctuation sensitivity was obtained in a general form. From its analysis gain in sensitivity, conditions were defined by the optimizing of the radiometer input knot¡¯s construction. Three modifications of the radiometer input knot were researched. Fluctuation sensitivity at different measurement range was determined for modification of the radiometer input knot.
%K Microwave Radiometer
%K Null Method of Measurement
%K Fluctuation Sensitivity
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=56978