Research on the possibility of reducing the error in measuring the phase shift of radio signals

The possibility of reducing the error in measuring the phase shift of radio signals by the orthogonal method using analogue quadrature demodulators in solving scientific and technical problems in energy, non-destructive testing, research on determining the composition of substances, in radar, radio navigation and radio direction finding is considered. The results of a mathematical analysis of the error in determining the phase shift of radio signals are provided, taking into account the main deviations of the technical characteristics of analogue quadrature demodulators from the ideal mathematical model, which made it possible to evaluate the effectiveness of the proposed improvements. To reduce the error in measuring the phase shift of radio signals by the orthogonal method using analogue quadrature demodulators, it is recommended to use the method of determining the phase shift in the control object at different phase shifts of the query signal applied to the control object. To achieve maximum accuracy, a sufficient number and maximum step of phase shifts of the query signal have been determined.