Software-defined calibration for FMCW phased-array radar

Journal Article

This paper addresses the problem of calibrating a FMCW phased-array radar to meet design specifications both in slant-range and beam pattern. The software-defined method presented here, while generally applicable, is implemented on an S-band phased-array radar which uses low-cost commercial-off-the-shelf (COTS) components designed for Wi-Fi communications. Calibration is performed on the receive array outputs in both fast-time to compensate for the non-linearity of the transmitter VCO and across antenna elements account for non-uniform interchannel phases, amplitudes, and time delays. Fast-time calibration is achieved using a digital closed-loop correction while spatial calibration involves operations to adjust the de-chirped frequency, phase, and amplitude of each channel. The calibration method is evaluated using a low-power wideband S-band linear FMCW radar with an 8-element receive array operating between 2.1 to 2.7 GHz. Results are presented which demonstrate the system achieves close to theoretically predicted 1 foot range and 16 degree azimuthal resolution, which is not achieved by the uncalibrated system. © 2010 IEEE.

Full Text

Duke Authors

Cited Authors

  • Li, L; Yu, J; Krolik, J

Published Date

  • July 30, 2010

Published In

Start / End Page

  • 877 - 881

International Standard Serial Number (ISSN)

  • 1097-5659

Digital Object Identifier (DOI)

  • 10.1109/RADAR.2010.5494498

Citation Source

  • Scopus