Short-Range Radar (original) (raw)

Engineering Embedded Systems, 2014

Abstract

In this second in a series of three technical essays, we demonstrate how Fourier transforms help in interpreting the signals produced by simple radars for speed and distance measurements. We start out with a discussion of the Doppler shift. Down-conversion of the high-frequency signals follows next. We consider the effects of finite observation time on the continuous-time Fourier transform. By approximating the continuous-time transform with a discrete-time Fourier transform and finally with a discrete Fourier transform, we derive the dependency between observation time and the speed resolution of the radar. The frequency-modulated continuous-wave radar for measuring distances follows next. Circuits and programs of a radar based on a commercially available radar module and demonstration of the radar conclude the treatise.

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