Waveform design and receive processing for nonrecurrent nonlinear FMCW radar

Gapped spectrum shaping for tandem-hopped radar/communications & cognitive sensing

“…In practice, of course, numerical imprecision and spectral roll-off issues prevent the optimized waveform from matching a Gaussian PSD exactly. However, in [5] range sidelobes below −70 dB were still achieved.…”

“…The PRO-FMCW waveform [5] is produced from pseudorandom initializations and is spectrally shaped on a "segmentwise" basis to produce a favorable autocorrelation response. However, the direct approach realizes spectral gaps that are rectangular in shape and thus produce range sidelobes with a sin(x)/x shape.…”

“…Receive processing for this non-repeating FMCW is discussed in [5]. Pulse compression can be performed on a persegment basis followed by Doppler processing across the segments, with the latter serving to suppress sidelobes since they do not coherently combine.…”

“…Here we leverage a recent new FM continuous wave (FMCW) waveform [5] that possesses the rather useful property of never repeating, while still maintaining a constant envelope (attractive for high power emission) and being wellcontained spectrally (with obvious utility in this context). Denoted as pseudo-random optimized (PRO) FMCW, this waveform has been experimentally demonstrated to achieve low range sidelobes and to be amenable for clutter cancellation to perform moving target detection.…”

Non-coherent PSK-based dual-function radar-communication systems

“…Note that, in practice, perfectly orthogonal coded waveforms cannot be achieved and, therefore, waveforms with low cross-correlations should be used. The problem of waveform design with desirable low cross-correlation properties has been extensively investigated in the literature (see [26]- [28], and references therein). However, the problem of waveform design is out of the scope of this paper.…”