ADVANCEMENTS IN INDUSTRIAL DIGITAL SENSORS (VERSION 3.0 TO 4.0) AND RADAR SYSTEMS FOR OBJECT DETECTION: A STATE-OF-THE-ART REVIEW: UDC: 681.586:621.396.969.3. etima 2025, 3 (1), 140-147. https://doi.org/10.46763/ETIMA2531140m.