Abstract
The phase-attached radar-communications (PARC) framework facilitates the co-design of these different functions within a common frequency modulated (FM) waveform, thereby enabling the operation of both without sacrificing transmission resources (i.e. power, time, frequency) needed for the primary radar function. Recently, the original pulsed PARC structure was extended to an FM continuous wave (FMCW) arrangement that maximizes data throughput. The resulting FMCW PARC waveforms were successfully demonstrated in an open-air environment for a ground-based moving target indication (MTI) application using a recent form of stretch processing that compensates for deviations from the linear chirping reference signal.However, the waveform-agile nature of PARC, which is necessary in order to convey information, does incur a performance cost that takes the form of range sidelobe modulation (RSM) of the clutter. To address this RSM degradation, here we introduce a range-dependent mismatched filtering approach for FMCW PARC based on a reduced-complexity Least-Squares (LS) formulation to determine the compensated transform in the final processing stage. The proposed approach is compared to the previous (range-dependent matched filter) compensated transform using experimental measurements, where a 5 dB signalto-interference-plus-noise (SINR) improvement is demonstrated.
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