Human-aware localization using linear-frequency-modulated continuous-wave radars

LFMCW Radar sensors can easily deal with unwanted targets situated in range bins in which the desired targets are not located. This is why an improvement in the range resolution is normally pursued, so that this range-isolation capability can be further enhanced.

Unfortunately, depending on the application, it is sometimes unavoidable to have clutter in the same desired range bin (e.g., if the vital signs of a person are to be monitored, it is almost impossible not to receive echoes from undesired parts, such as head or limbs). If the radar is coherent, the new dimension Doppler can be exploited to devise specific methods which try to mitigate this in-cell unwanted clutter .

Consider the scenario shown in Fig. 5.22, which is analogous to the one depicted in Fig. 5.14, with the inclusion of a stationary clutter scatterer at the same distance of the wanted sinusoidally-vibrating target. The radar prototype is assumed to have a center frequency of fc=5.8 GHz. The transmitted bandwidth is B=160 MHz and the PRF is 500 Hz, whereas the CPI is 12 seconds.

The mean range to the targets is Rc=5.625 m, whereas the sinusoidal motion of the desired target is defined through its range amplitude (peak-to-peak Rpp=50 cm) and its frequency (ft=0.5 Hz). The amplitude of the desired target is Kd=1, whereas the amplitude of the clutter scatterer is Kc=1.2.

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