Short-range wideband FMCW radar for millimetric displacement measurementsReportar como inadecuado

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1 GIPSA-SIGMAPHY - SIGMAPHY GIPSA-DIS - Département Images et Signal 2 UPB - University Politehnica of Bucharest Romania

Abstract : The frequency modulated continuous wave FMCW radar is an alternative to the pulse radar when the distance to the target is short. Typical FMCW radar implementations have a homodyne architecture transceiver which limits the performances for short-range applications: the beat frequency can be relatively small and placed in the frequency range affected by the specific homodyne issues DC offset, self-mixing and 1-f noise. Additionally, one classical problem of a FMCW radar is that the voltage controlled oscillator adds a certain degree of nonlinearity which can cause a dramatic resolution degradation for wideband sweeps. This paper proposes a short-range X-band FMCW radar platform which solves these two problems by using a heterodyne transceiver and a wideband nonlinearity correction algorithm based on high-order ambiguity functions and time resampling. The platform-s displacement measurement capability was tested on range profiles and synthetic aperture radar SAR images acquired for various targets. The displacements were computed from the interferometric phase and the measurement errors were situated below 0.1 mm for metal bar targets placed at a few meters from the radar.

Autor: Andrei Anghel - Gabriel Vasile - Remus Cacoveanu - Cornel Ioana - Silviu Ciochina -



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