F. Michler, Kilin Shi, S. Schellenberger, B. Scheiner, F. Lurz, R. Weigel, A. Koelpin
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On the Impact of System Nonlinearities in Continuous-Wave Radar Systems for Vital Parameter Sensing
This paper investigates the influence of nonlinearities on relative distance measurements by continuous-wave radar systems. For the case of a six-port receiver architecture, a mathematical relationship between detector nonlinearity and measurement error is derived. Moreover, a generalized sinusoidal error model, which fits both six-port and mixer-based radar systems, is used to study the effect of nonlinear mixing when one or more displacement movements with different amplitudes are to be detected.
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