Multiband chirp synthesis for frequency-hopped FMCW radar

  • Authors:

  • Jason Yu;Jeffrey Krolik

  • Affiliations:

  • Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina;Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina

  • Venue:
  • Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
  • Year:
  • 2009

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Abstract

This paper presents a method for increasing radar range resolution by stitching together non-contiguous frequency-hopped FMCW radar sweeps across different dwells. The work extends previous bandwidth extrapolation methods, designed for radar imaging of space-based objects, to applications involving clutter-dominated downward-looking radars. Multiband chirp synthesis (MCS) uses an AR model for the de-chirped radar return in frequency-separated sub-bands across multiple dwells to interpolate missing fast-time data. The method aims to achieve range resolution commensurate with the full frequency-hopped band of the radar rather than the much narrower sub-bands used during each dwell. Both pre- and post-Doppler MCS methods are discussed. Real data results are presented using a 2.4 GHz laboratory radar to synthesize a 600 MHz bandwidth return from multiple fractional sub-band dwells.