MIMO radar exploiting narrowband frequency-hopping waveforms

Accurate estimation and tracking of the position of moving targets is an important task in urban sensing operations. Dual-frequency radar, which estimates the range of a target based on the phase difference between two closely spaced frequencies, has been shown to be a cost-effective method to accomplish range-to-motion estimation and tracking. Target positioning can be achieved by using multiple dual-frequency radar antennas, either coherently or noncoherenly processed. The dual-frequency radar concept has been extended to develop narrowband (NB) frequency-hopping (FH) radar which, while inherits the advantages of dual-frequency radars, spreads the power over a bandwidth and thereby reduces the signal visibility, probability of intercept, and interference to/from other systems. In this paper, we consider MIMO radar systems that use NB-FH signals to achieve effective positioning of moving/vibrating targets with a small array aperture.