The X-band Long-range Quad-cell Radar For All-weather Detection And Early Warning Of Low Small And Slow Targets Product Overview The DD-R27P X-band long-range quad-cell radar employs a fully solid-state, fully coherent, and pulse Doppler system. This allows for all-weather detection and early warning of "low, small, slow" targets. Through the utilization of machine learning and AI recognition, which are founded on "micro-Doppler signatures" and "flight path features"