Short-range wideband FMCW radar for millimetric displacement measurements

Andrei Anghel (1) , Gabriel Vasile (1) , Remus Cacoveanu (2) , Cornel Ioana (1) , Silviu Ciochina (2)

1 GIPSA-SIGMAPHY - GIPSA - Signal Images Physique
2 UPB - University Politehnica of Bucharest [Romania]

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.

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Andrei Anghel, Gabriel Vasile, Remus Cacoveanu, Cornel Ioana, Silviu Ciochina. Short-range wideband FMCW radar for millimetric displacement measurements. IEEE Transactions on Geoscience and Remote Sensing, 2014, 52 (9), pp.5633-5642. ⟨10.1109/TGRS.2013.2291573⟩. ⟨hal-00974718⟩