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Conventional sensing applications rely on electromagnetic far-field channelmodels with plane wave propagation. However, recent ultra-short-rangeautomotive radar applications at upper millimeter-wave or low terahertz (THz)frequencies envisage operation in the near-field region, where the wavefront isspherical. Unlike far-field, the near-field beampattern is dependent on bothrange and angle, thus requiring a different approach to waveform design. Forthe first time in the literature, we adopt the beampattern matching approach todesign unimodular waveforms for THz automotive radars with low weightedintegrated sidelobe levels (WISL). We formulate this problem as a unimodularbi-quadratic matrix program, and solve its constituent quadratic sub-problemsusing our cyclic power method-like iterations (CyPMLI) algorithm. Numericalexperiments demonstrate that the CyPMLI approach yields the requiredbeampattern with low autocorrelation levels.

Near-Field Low-WISL Unimodular Waveform Design for Terahertz Automotive Radar